alibris.com

alibris.com is SSL secured

Free website and domain report on alibris.com

Last Updated: 9th October, 2021 Update Now
Overview

Snoop Summary for alibris.com

This is a free and comprehensive report about alibris.com. The domain alibris.com is currently hosted on a server located in United States with the IP address 104.16.136.245, where USD is the local currency and the local language is English. Our records indicate that alibris.com is owned/operated by Alibris. Alibris.com is expected to earn an estimated $94 USD per day from advertising revenue. The sale of alibris.com would possibly be worth $68,982 USD. This figure is based on the daily revenue potential of the website over a 24 month period. Alibris.com is wildly popular with an estimated 22,342 daily unique visitors. This report was last updated 9th October, 2021.

About alibris.com

Site Preview: alibris.com alibris.com
Title: Alibris
Description: Information on beginning or sustaining a book collection (Alibris.com).
Keywords and Tags: online shopping, popular
Related Terms: beginning
Fav Icon:
Age: Over 25 years old
Domain Created: 1st April, 1998
Domain Updated: 16th May, 2019
Domain Expires: 30th March, 2024
Review

Snoop Score

3/5 (Great!)

Valuation

$68,982 USD
Note: All valuation figures are estimates.

Popularity

High
Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank: 33,787
Alexa Reach:
SEMrush Rank (US):
SEMrush Authority Score:
Moz Domain Authority: 0
Moz Page Authority: 0

Organic vs Paid (Google Ads)

Traffic

Visitors

Daily Visitors: 22,342
Monthly Visitors: 680,020
Yearly Visitors: 8,154,830
Note: All visitors figures are estimates.

Visitors By Country

Revenue

Revenue

Daily Revenue: $94 USD
Monthly Revenue: $2,876 USD
Yearly Revenue: $34,486 USD
Note: All revenue figures are estimates.

Revenue By Country

SEO

Backlinks Analysis (SEMrush)

Top New Follow Links

Top Ranking Keywords (US)

Domain Analysis

Value Length
Domain: alibris.com 11
Domain Name: alibris 7
Extension (TLD): com 3
Expiry Check:

Page Speed Analysis

Average Load Time: 1.13 seconds
Load Time Comparison: Faster than 74% of sites

PageSpeed Insights

Avg. (All Categories) 76
Performance 92
Accessibility 98
Best Practices 60
SEO 92
Progressive Web App 36
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://www.alibris.com/
Updated: 9th October, 2021

1.76 seconds
First Contentful Paint (FCP)
76%
13%
11%

0.00 seconds
First Input Delay (FID)
96%
2%
2%

Simulate loading on desktop
92

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for alibris.com. This includes details about optimizing page load times which can result in a better user experience.

Metrics

Speed Index — 1.2 s
The time taken for the page contents to be visibly populated.
Total Blocking Time — 30 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).
Cumulative Layout Shift — 0
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Other

Max Potential First Input Delay — 100 ms
Users could experience a delay when interacting with the page.
Network Requests
Below is a list of network requests that were made during page load.
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Image
https://script.crazyegg.com/pages/scripts/0027/3483.js
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http/1.1
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https://sync.mathtag.com/sync/img?mt_exid=10012&redir=https://tag.crsspxl.com/m.gif?mmid=[MM_UUID]
http/1.1
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http/1.1
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https://tags.bluekai.com/site/18282?phint=id%3D4791883841965848389
http/1.1
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https://cms.analytics.yahoo.com/cms?partner_id=CROEL
http/1.1
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https://blip.bizrate.com/sync?partnerID=cp&partnerUUID=4791883841965848389
http/1.1
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https://pxl.connexity.net/c/cse?a=R&A=227&D=5665&V=9&I0k=ptnrid&I0v=4791883841965848389
http/1.1
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https://ce.lijit.com/merge?pid=5110&3pid=4791883841965848389
http/1.1
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http/1.1
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http/1.1
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https://tag.crsspxl.com/m.gif?tnid=7007111420056227164
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http/1.1
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Image
https://match.adsrvr.org/track/cmf/generic?ttd_pid=aam
http/1.1
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text/html
https://match.adsrvr.org/track/cmf/generic?ttd_pid=aam
http/1.1
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http/1.1
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http/1.1
1455.9569992125
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text/plain
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http/1.1
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Ping
https://track.nextuser.com/iam_style.css?tid=alibris
http/1.1
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text/css
Stylesheet
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http/1.1
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https://beacon.krxd.net/usermatch.gif?kuid_status=new&partner=liveramp_identity
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http/1.1
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https://tag.crsspxl.com/s.gif?cnxid=16338082083943654688509990099001763
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Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
596.23
7.333
607.664
21.438
629.114
7.645
642.285
6.428
670.181
14.67
707.1
27.003
751.284
8.124
760.308
42.158
809.553
11.582
832.122
18.238
852.597
6.145
939.867
27.417
967.598
14.829
987.149
33.288
1020.491
5.69
1032.298
57.082
1089.414
6.261
1095.685
6.899
1104.389
11.371
1116.549
6.838
1134.032
5.838
1142.443
66.726
1217.708
22.566
1240.348
37.695
1284.869
16.817
1301.725
29.029
1336.892
6.433
1343.375
15.42
1421.068
9.233
1431.345
7.061
1438.757
6.352
1547.507
100.167
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Opportunities

Properly size images — Potential savings of 11 KiB
Images can slow down the page's load time. Alibris.com should consider serving more appropriate-sized images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://www0.alibris-static.com/little-blue-trucks-springtime/isbn/9780544938090.gif
29912
11127
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Alibris.com should consider minifying CSS files.
Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Alibris.com should consider minifying JS files.
Reduce unused CSS — Potential savings of 54 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Alibris.com should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://www4.alibris-static.com/css/en_US_alibris/redMain7.185.034-s.css
37481
35026
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css
21264
20289
Enable text compression — Potential savings of 2 KiB
Text-based resources should be served with compression, such as gzip, deflate or brotli.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://track.nextuser.com/iam_style.css?tid=alibris
3215
2392
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 280 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://www.alibris.com/
279.626
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Alibris.com should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers — Potential savings of 7 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://track.nextuser.com/nu.js?tid=alibris&v=1.3
6695
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.

Diagnostics

Avoids enormous network payloads — Total size was 1,517 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://track.nextuser.com/nu.js?tid=alibris&v=1.3
97602
https://www3.alibris-static.com/images/promos/red/ebooks/ebooks_homepage_banner_fall_2020.jpg
83292
https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js
69066
https://www.googletagmanager.com/gtag/js?id=G-LVVVEGSLSZ
62154
https://www.googletagmanager.com/gtm.js?id=GTM-KQ6HMJ
56876
https://www2.alibris-static.com/images/promos/red/nav/explore_seasonalGuide.jpg
50020
https://www1.alibris-static.com/images/promos/red/homepage-slides/free_ship_hero.jpg
48949
https://www4.alibris-static.com/images/promos/red/nav/bargains_dailyCoupons.jpg
48089
https://www0.alibris-static.com/images/promos/red/fall-2021/2021_homepage_banner_fall.jpg
47208
https://www4.alibris-static.com/images/promos/red/bts/bts-2019-fall/textbook_buyback_banner_2019_fall.jpg
45068
Avoid chaining critical requests — 4 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Alibris.com should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
JavaScript execution time — 0.3 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://www.alibris.com/
152.613
17.492
0.837
Unattributable
143.298
5.747
0.183
https://www.alibris.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js
114.724
96.403
1.596
https://track.nextuser.com/nu.js?tid=alibris&v=1.3
112.76
89.344
7.001
https://www.googletagmanager.com/gtm.js?id=GTM-KQ6HMJ
83.052
71.167
6.727
Minimizes main-thread work — 0.9 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
481.488
Other
176.729
Style & Layout
78.818
Parse HTML & CSS
51.564
Script Parsing & Compilation
35.869
Rendering
33.985
Garbage Collection
16.233
All text remains visible during webfont loads
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
Keep request counts low and transfer sizes small — 157 requests • 1,517 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
157
1553460
Image
82
966446
Script
29
466751
Stylesheet
5
73385
Other
38
26574
Document
3
20304
Media
0
0
Font
0
0
Third-party
146
1470091
Minimize third-party usage — Third-party code blocked the main thread for 0 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
157564
0
100958
0
32575
0
23226
0
21040
0
11295
0
5498
0
4911
0
4190
0
3855
0
2893
0
2769
0
2613
0
2221
0
1953
0
1566
0
1551
0
1463
0
1461
0
1426
0
985
0
772
0
682
0
612
0
518
0
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Largest Contentful Paint image was not lazily loaded
Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint.
Element
Avoid large layout shifts
Below is a list of all DOM elements that contribute to the CLS of the page.
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks — 2 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://track.nextuser.com/nu.js?tid=alibris&v=1.3
3525
100
https://www.googletagmanager.com/gtm.js?id=GTM-KQ6HMJ
2348
67
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of alibris.com on mobile screens.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Metrics

First Contentful Paint — 1.1 s
The time taken for the first image or text on the page to be rendered.
Largest Contentful Paint — 1.4 s
The timing of the largest text or image that is painted.
Time to Interactive — 2.9 s
The time taken for the page to become fully interactive.

Other

First Meaningful Paint — 1.1 s
The time taken for the primary content of the page to be rendered.

Opportunities

Eliminate render-blocking resources — Potential savings of 310 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Alibris.com should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://www1.alibris-static.com/css/en_US_alibris/jquery-ui7.185.034-s.css
5467
230
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css
21264
270
https://www4.alibris-static.com/css/en_US_alibris/redMain7.185.034-s.css
37481
310
Defer offscreen images — Potential savings of 613 KiB
Time to Interactive can be slowed down by resources on the page. Alibris.com should consider lazy-loading offscreen and hidden images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://www3.alibris-static.com/images/promos/red/ebooks/ebooks_homepage_banner_fall_2020.jpg
82689
82689
https://www2.alibris-static.com/images/promos/red/nav/explore_seasonalGuide.jpg
49417
49417
https://www4.alibris-static.com/images/promos/red/nav/bargains_dailyCoupons.jpg
47486
47486
https://www4.alibris-static.com/images/promos/red/bts/bts-2019-fall/textbook_buyback_banner_2019_fall.jpg
44468
44468
https://www1.alibris-static.com/images/promos/red/homepage-slides/free_ship_hero.jpg
48346
38457
https://www4.alibris-static.com/images/promos/red/nav/text_buyback.jpg
38340
38340
https://www2.alibris-static.com/images/promos/red/nav/text_bts.jpg
38158
38158
https://www1.alibris-static.com/images/promos/red/nav/movies_advanced.jpg
35668
35668
https://www0.alibris-static.com/images/promos/red/nav/explore_community.jpg
31584
31584
https://www1.alibris-static.com/images/promos/red/nav/bargains_discountBooks.jpg
30975
30975
https://www2.alibris-static.com/images/promos/red/kids-teens/kids_banner_landingPage.jpg
34445
27399
https://www3.alibris-static.com/images/promos/red/nav/explore_blog.jpg
26378
26378
https://www1.alibris-static.com/images/promos/red/nav/explore_authorPersonalities.jpg
20953
20953
https://www3.alibris-static.com/images/promos/red/nav/bargains_freeShipping.jpg
18267
18267
https://www.alibris.com/images/promos/red/kids-teens/kids_nav_316x236.jpg
18035
18035
https://www.alibris.com/images/promos/red/kids-teens/kids_nav_YA_316x236.jpg
15704
15704
https://www1.alibris-static.com/images/promos/red/nav/books_rare_new.jpg
9927
9927
https://www3.alibris-static.com/images/promos/red/nav/music_classical_new.jpg
8663
8663
https://www2.alibris-static.com/images/promos/red/nav/books_search_new.jpg
8463
8463
https://www2.alibris-static.com/images/promos/red/ebooks/ebook-nav-reader.jpg
8050
8050
https://www0.alibris-static.com/images/promos/red/nav/music_search_new.jpg
7260
7260
https://www4.alibris-static.com/images/promos/red/nav/music-nav.jpg
7043
7043
https://www2.alibris-static.com/images/promos/red/nav/movies_aclaimed_new.jpg
6970
6970
https://www4.alibris-static.com/images/promos/red/nav/books_favorites_new.jpg
6948
6948
Reduce unused JavaScript — Potential savings of 125 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js
69066
60033
https://www.googletagmanager.com/gtag/js?id=G-LVVVEGSLSZ
62154
26485
https://www.googletagmanager.com/gtag/js?id=DC-6901668&l=dataLayer&cx=c
38534
21164
https://track.nextuser.com/nu.js?tid=alibris&v=1.3
97602
20820
Efficiently encode images — Potential savings of 199 KiB
Unoptimized images can consume more cellular data than what is necessary.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://www2.alibris-static.com/images/promos/red/nav/explore_seasonalGuide.jpg
49417
32144
https://www4.alibris-static.com/images/promos/red/nav/bargains_dailyCoupons.jpg
47486
28574
https://www4.alibris-static.com/images/promos/red/nav/text_buyback.jpg
38340
24430
https://www2.alibris-static.com/images/promos/red/nav/text_bts.jpg
38158
24174
https://www1.alibris-static.com/images/promos/red/nav/movies_advanced.jpg
35668
20871
https://www0.alibris-static.com/images/promos/red/nav/explore_community.jpg
31584
19852
https://www1.alibris-static.com/images/promos/red/nav/bargains_discountBooks.jpg
30975
18741
https://www3.alibris-static.com/images/promos/red/nav/explore_blog.jpg
26378
13353
https://www3.alibris-static.com/images/promos/red/nav/bargains_freeShipping.jpg
18267
11182
https://www1.alibris-static.com/images/promos/red/nav/explore_authorPersonalities.jpg
20953
10789
Serve images in next-gen formats — Potential savings of 355 KiB
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://www2.alibris-static.com/images/promos/red/nav/explore_seasonalGuide.jpg
49417
39971.55
https://www4.alibris-static.com/images/promos/red/nav/bargains_dailyCoupons.jpg
47486
37482.8
https://www3.alibris-static.com/images/promos/red/ebooks/ebooks_homepage_banner_fall_2020.jpg
82689
37318.7
https://www4.alibris-static.com/images/promos/red/nav/text_buyback.jpg
38340
31260.1
https://www2.alibris-static.com/images/promos/red/nav/text_bts.jpg
38158
30929.2
https://www1.alibris-static.com/images/promos/red/nav/movies_advanced.jpg
35668
27928.75
https://www0.alibris-static.com/images/promos/red/nav/explore_community.jpg
31584
25826.2
https://www1.alibris-static.com/images/promos/red/nav/bargains_discountBooks.jpg
30975
24746.1
https://www1.alibris-static.com/images/promos/red/homepage-slides/free_ship_hero.jpg
48346
23713.5
https://www3.alibris-static.com/images/promos/red/nav/explore_blog.jpg
26378
19724.95
https://www4.alibris-static.com/images/promos/red/bts/bts-2019-fall/textbook_buyback_banner_2019_fall.jpg
44468
16648.75
https://www1.alibris-static.com/images/promos/red/nav/explore_authorPersonalities.jpg
20953
15892
https://www3.alibris-static.com/images/promos/red/nav/bargains_freeShipping.jpg
18267
15042.15
https://www.alibris.com/images/promos/red/kids-teens/kids_nav_316x236.jpg
18035
8781.1
https://www2.alibris-static.com/images/promos/red/kids-teens/kids_banner_landingPage.jpg
34445
8727
Avoid multiple page redirects — Potential savings of 530 ms
Redirects can cause additional delays before the page can begin loading. Alibris.com should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://alibris.com/
190
https://alibris.com/
150
http://www.alibris.com/
190
https://www.alibris.com/
0

Diagnostics

Serve static assets with an efficient cache policy — 84 resources found
Alibris.com can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://js.b1js.com/tagcontainer.js?id=9d8f53cd2b864fa8aa323144431bef11&type=1
0
3547
https://sealserver.trustwave.com/seal_image.php?customerId=b8893b161c294f7ba3521f4dfc863652&size=105x54&style=invert
0
2084
https://tag.crsspxl.com/s1.js?d=2453&cb=1633808207341
0
1467
https://sealserver.trustwave.com/seal.js?style=invert&code=b8893b161c294f7ba3521f4dfc863652
0
975
https://tags.bluekai.com/site/18282?phint=id%3D4791883841965848389
0
733
https://tag.crsspxl.com/m.gif?tdid=cbb4a883-7909-44ed-a7c2-29c2829e49ee
0
399
https://tag.crsspxl.com/m.gif?tnid=7007111420056227164
0
385
https://b1img.com/js_container?site_id=9d8f53cd2b864fa8aa323144431bef11&type=1&callback=b1Ctn.parseUuidResponse
0
368
https://b1img.com/9d8f53cd2b864fa8aa323144431bef11/cs_tag/?ids=2836625,16707011,17221140,2783938,14216518
0
274
https://tag.crsspxl.com/m.gif?id=&google_gid=CAESEAKwqG5PxwavziHB_O32Ve4&google_cver=1
0
253
https://tag.crsspxl.com/m.gif?mmid=f0e96161-ef4f-4c00-8c42-57f0b50f1017
0
253
https://tag.crsspxl.com/m.gif?oxid=5dd8ba2b-f200-42e5-9e6b-8889fbdeddc8
0
253
https://tag.crsspxl.com/m.gif?yahoo_id=y-QceXnvNE2pNR1Yapt5xWl2Hf1LAjVqae8sA-~A
0
253
https://tag.crsspxl.com/s.gif?cnxid=16338082083943654688509990099001763
0
142
https://track.nextuser.com/nu.js?tid=alibris&v=1.3
600000
97602
https://track.nextuser.com/iam_style.css?tid=alibris
600000
3405
https://tags.b1js.com/tags/9d8f53cd2b864fa8aa323144431bef11.js
3600000
6332
https://cdn.granify.com/assets/javascript.js?id=1205&v=2021109
3600000
1148
https://www.google-analytics.com/analytics.js
7200000
20399
https://www3.alibris-static.com/images/promos/red/ebooks/ebooks_homepage_banner_fall_2020.jpg
14400000
83292
https://www2.alibris-static.com/images/promos/red/nav/explore_seasonalGuide.jpg
14400000
50020
https://www1.alibris-static.com/images/promos/red/homepage-slides/free_ship_hero.jpg
14400000
48949
https://www4.alibris-static.com/images/promos/red/nav/bargains_dailyCoupons.jpg
14400000
48089
https://www0.alibris-static.com/images/promos/red/fall-2021/2021_homepage_banner_fall.jpg
14400000
47208
https://www4.alibris-static.com/images/promos/red/bts/bts-2019-fall/textbook_buyback_banner_2019_fall.jpg
14400000
45068
https://www4.alibris-static.com/images/promos/red/nav/text_buyback.jpg
14400000
38943
https://www2.alibris-static.com/images/promos/red/nav/text_bts.jpg
14400000
38761
https://www4.alibris-static.com/css/en_US_alibris/redMain7.185.034-s.css
14400000
37481
https://www1.alibris-static.com/images/promos/red/nav/movies_advanced.jpg
14400000
36271
https://www2.alibris-static.com/images/promos/red/kids-teens/kids_banner_landingPage.jpg
14400000
35050
https://www0.alibris-static.com/images/promos/red/nav/explore_community.jpg
14400000
32187
https://www1.alibris-static.com/images/promos/red/nav/bargains_discountBooks.jpg
14400000
31578
https://www0.alibris-static.com/little-blue-trucks-springtime/isbn/9780544938090.gif
14400000
30511
https://www3.alibris-static.com/images/promos/red/nav/explore_blog.jpg
14400000
26981
https://www1.alibris-static.com/images/promos/red/nav/explore_authorPersonalities.jpg
14400000
21556
https://www3.alibris-static.com/images/promos/red/nav/bargains_freeShipping.jpg
14400000
18870
https://www0.alibris-static.com/where-the-crawdads-sing/isbn/9780735219106.gif
14400000
17928
https://www3.alibris-static.com/images/red/home/category/movies_350.jpg
14400000
16075
https://www3.alibris-static.com/images/promos/red/alibris-blog-home.gif
14400000
13681
https://www1.alibris-static.com/images/red/home/category/music_350.jpg
14400000
12571
https://www4.alibris-static.com/images/promos/red/fall-2021/homepage_childrens_2021_fall.jpg
14400000
11814
https://www3.alibris-static.com/images/promos/red/fall-2021/homepage_cookbooks_2021_fall.jpg
14400000
11266
https://www3.alibris-static.com/images/promos/red/fall-2021/homepage_crafting_2021_fall.jpg
14400000
11028
https://www4.alibris-static.com/images/promos/red/fall-2021/homepage_fiction_2021_fall.jpg
14400000
10812
https://www1.alibris-static.com/images/promos/red/nav/books_rare_new.jpg
14400000
10529
https://www4.alibris-static.com/images/promos/red/fall-2021/homepage_textbooks_2021_fall.jpg
14400000
9856
https://www3.alibris-static.com/think-again-the-power-of-knowing-what-you-dont-know/isbn/9781984878106.gif
14400000
9653
https://www4.alibris-static.com/the-secret-life-of-pets/cover/w32313nuh1w.jpg
14400000
9531
https://www3.alibris-static.com/images/promos/red/nav/music_classical_new.jpg
14400000
9264
https://www2.alibris-static.com/images/promos/red/nav/books_search_new.jpg
14400000
9064
https://www2.alibris-static.com/images/promos/red/ebooks/ebook-nav-reader.jpg
14400000
8652
https://www3.alibris-static.com/images/promos/red/fall-2021/homepage_romance_2021_fall.jpg
14400000
8361
https://www0.alibris-static.com/images/promos/red/fall-2021/homepage_ebooks_2021_fall.jpg
14400000
8125
https://www3.alibris-static.com/images/promos/red/fall-2021/homepage_mystery_2021_fall.jpg
14400000
8004
https://www0.alibris-static.com/images/promos/red/nav/music_search_new.jpg
14400000
7861
https://www4.alibris-static.com/images/promos/red/nav/music-nav.jpg
14400000
7644
https://www2.alibris-static.com/images/promos/red/nav/movies_aclaimed_new.jpg
14400000
7571
https://www4.alibris-static.com/images/promos/red/nav/books_favorites_new.jpg
14400000
7549
https://www0.alibris-static.com/guardians-of-the-galaxy-awesome-mix-vol-2/cover/z91950bbxw4.jpg
14400000
7489
https://www4.alibris-static.com/css/en_US_alibris/promos-red7.185.034-s.css
14400000
5768
https://www1.alibris-static.com/css/en_US_alibris/jquery-ui7.185.034-s.css
14400000
5467
https://seal-goldengate.bbb.org/seals/blue-seal-200-42-whitetxt-bbb-17525.png
14400000
4190
https://www4.alibris-static.com/images/red/home/Free_Shipping.png
14400000
4153
https://www0.alibris-static.com/images/red/footer/pintrest-60.gif
14400000
3388
https://www4.alibris-static.com/images/red/ajax-loader.gif
14400000
3192
https://www3.alibris-static.com/images/red/footer/logo-footer.gif
14400000
3176
https://www3.alibris-static.com/images/red/nav/alibris-logo.gif
14400000
3165
https://www1.alibris-static.com/images/red/footer/twitter-60.gif
14400000
2949
https://www1.alibris-static.com/images/red/footer/facebook-60.gif
14400000
2734
https://www1.alibris-static.com/images/red/footer/rovi.png
14400000
2681
https://www1.alibris-static.com/framework/skins/alibris/js/red.7.185.034.js
14400000
2151
https://www2.alibris-static.com/images/red/footer/blog-60.gif
14400000
2089
https://www2.alibris-static.com/images/red/nav/select-arrow-trans.gif
14400000
1849
https://www4.alibris-static.com/images/red/nav/mag-glass-header.png
14400000
1822
https://www3.alibris-static.com/framework/skins/alibris/js/complete.7.185.034.js
14400000
1671
https://www0.alibris-static.com/framework/skins/alibris/js/jquery.menu-aim.7.185.034.js
14400000
1570
https://www1.alibris-static.com/framework/skins/alibris/js/web.7.185.034.js
14400000
1568
https://www1.alibris-static.com/framework/skins/alibris/js/jquery.hoverIntent.minified.7.185.034.js
14400000
1291
https://www3.alibris-static.com/images/red/carousels/carousel-left-arrow-white.png
14400000
974
https://www4.alibris-static.com/images/red/carousels/carousel-right-arrow-white.png
14400000
973
https://www1.alibris-static.com/images/red/nav/cart.png
14400000
886
https://www1.alibris-static.com/images/spacer.gif
14400000
657
https://static.cloudflareinsights.com/beacon.min.js
86400000
5568
https://www.alibris.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js
172800000
4421
Avoid an excessive DOM size — 1,674 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
1674
Maximum DOM Depth
33
Maximum Child Elements
25
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Source
Image elements do not have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.
URL Failing Elements
https://www1.alibris-static.com/images/promos/red/homepage-slides/free_ship_hero.jpg
https://www0.alibris-static.com/images/promos/red/fall-2021/2021_homepage_banner_fall.jpg
https://www2.alibris-static.com/images/promos/red/kids-teens/kids_banner_landingPage.jpg
https://www3.alibris-static.com/images/promos/red/ebooks/ebooks_homepage_banner_fall_2020.jpg
https://www4.alibris-static.com/images/promos/red/bts/bts-2019-fall/textbook_buyback_banner_2019_fall.jpg
https://www1.alibris-static.com/images/promos/red/homepage-slides/free_ship_hero.jpg
https://www0.alibris-static.com/images/promos/red/fall-2021/2021_homepage_banner_fall.jpg
https://www2.alibris-static.com/images/promos/red/kids-teens/kids_banner_landingPage.jpg
https://www3.alibris-static.com/images/promos/red/ebooks/ebooks_homepage_banner_fall_2020.jpg
https://www4.alibris-static.com/images/promos/red/bts/bts-2019-fall/textbook_buyback_banner_2019_fall.jpg
https://www1.alibris-static.com/images/promos/red/homepage-slides/free_ship_hero.jpg
https://www4.alibris-static.com/images/red/home/Free_Shipping.png
https://www1.alibris-static.com/images/red/home/category/music_350.jpg
https://www3.alibris-static.com/images/red/home/category/movies_350.jpg
https://www4.alibris-static.com/images/promos/red/fall-2021/homepage_textbooks_2021_fall.jpg
https://www4.alibris-static.com/images/promos/red/fall-2021/homepage_fiction_2021_fall.jpg
https://www3.alibris-static.com/images/promos/red/fall-2021/homepage_romance_2021_fall.jpg
https://www0.alibris-static.com/images/promos/red/fall-2021/homepage_ebooks_2021_fall.jpg
https://www3.alibris-static.com/images/promos/red/fall-2021/homepage_cookbooks_2021_fall.jpg
https://www4.alibris-static.com/images/promos/red/fall-2021/homepage_childrens_2021_fall.jpg
https://www3.alibris-static.com/images/promos/red/fall-2021/homepage_crafting_2021_fall.jpg
https://www3.alibris-static.com/images/promos/red/fall-2021/homepage_mystery_2021_fall.jpg
https://www0.alibris-static.com/little-blue-trucks-springtime/isbn/9780544938090.gif
https://www3.alibris-static.com/images/promos/red/alibris-blog-home.gif
https://www4.alibris-static.com/the-secret-life-of-pets/cover/w32313nuh1w.jpg
https://www0.alibris-static.com/where-the-crawdads-sing/isbn/9780735219106.gif
https://www3.alibris-static.com/think-again-the-power-of-knowing-what-you-dont-know/isbn/9781984878106.gif
https://www0.alibris-static.com/guardians-of-the-galaxy-awesome-mix-vol-2/cover/z91950bbxw4.jpg
https://www.alibris.com/images/red/footer/footer-shipping-globe.png
https://seal-goldengate.bbb.org/seals/blue-seal-200-42-whitetxt-bbb-17525.png
https://www3.alibris-static.com/images/red/nav/alibris-logo.gif
https://www.alibris.com/images/red/footer/trustpilot-rating.gif
https://sealserver.trustwave.com/seal_image.php?customerId=b8893b161c294f7ba3521f4dfc863652&size=105x54&style=invert
https://www3.alibris-static.com/images/red/footer/logo-footer.gif
https://www1.alibris-static.com/images/red/footer/facebook-60.gif
https://www1.alibris-static.com/images/red/footer/twitter-60.gif
https://www0.alibris-static.com/images/red/footer/pintrest-60.gif
https://www2.alibris-static.com/images/red/footer/blog-60.gif
https://www1.alibris-static.com/images/red/nav/cart.png
https://www1.alibris-static.com/images/spacer.gif
98

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of alibris.com. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Contrast

Background and foreground colors have a sufficient contrast ratio
Many (if not most) users find low-contrast text difficult or impossible to read.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Alibris.com may provide assistance to deaf or hearing-impaired users with captions on videos.

Navigation

Some elements have a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.
Failing Elements

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
60

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that alibris.com should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
Bootstrap
3.3.7
jQuery
3.4.1
jQuery UI
1.12.1
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 2 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://alibris.com/
Allowed
http://www.alibris.com/
Allowed
Links to cross-origin destinations are unsafe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Includes front-end JavaScript libraries with known security vulnerabilities — 7 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Library Version Vulnerability Count Highest Severity
5
Medium
2
Medium

Audits

Displays images with incorrect aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
URL Aspect Ratio (Displayed) Aspect Ratio (Actual)
https://www0.alibris-static.com/little-blue-trucks-springtime/isbn/9780544938090.gif
130 x 187 (0.70)
207 x 187 (1.11)

Audits

Page lacks the HTML doctype, thus triggering quirks-mode
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.

Audits

Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Source Description
Failed to load resource: the server responded with a status of 403 (Forbidden)
Failed to load resource: the server responded with a status of 404 (Not Found)
92

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for alibris.com. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of alibris.com on mobile screens.
Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Links do not have descriptive text — 4 links found
Make use of descriptive link text to assist search engines in understanding the content.

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
36

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of alibris.com. This includes details about web app manifests.

PWA Optimized

Redirects HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of alibris.com on mobile screens.

Installable

Web app manifest or service worker do not meet the installability requirements — 1 reason
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
Failure reason
No manifest was fetched

PWA Optimized

Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Avg. (All Categories) 64
Performance 36
Accessibility 88
Best Practices 60
SEO 86
Progressive Web App 50
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://m.alibris.com/
Updated: 9th October, 2021

2.18 seconds
First Contentful Paint (FCP)
67%
19%
14%

0.02 seconds
First Input Delay (FID)
93%
6%
1%

Simulate loading on mobile
36

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for alibris.com. This includes details about optimizing page load times which can result in a better user experience.

Metrics

Cumulative Layout Shift — 0
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Opportunities

Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Alibris.com should consider lazy-loading offscreen and hidden images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Alibris.com should consider minifying CSS files.
Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 560 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://m.alibris.com/
556.632
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Alibris.com should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.

Diagnostics

Avoids enormous network payloads — Total size was 836 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/images/sprites.png
156096
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/javascript/main-mobile.js
85768
https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js
69065
https://www.googletagmanager.com/gtag/js?id=G-LVVVEGSLSZ
62095
https://www.googletagmanager.com/gtm.js?id=GTM-KQ6HMJ
56876
https://m.alibris.com/images/promos/red/fall-2021/2021_homepage_banner_fall.jpg
47773
https://www.googletagmanager.com/gtag/js?id=DC-6901668&l=dataLayer&cx=c
38532
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/stylesheets/.css/devices/mobile.css
36169
https://m.alibris.com/
25744
https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww4.alibris-static.com%2Fthe-wonky-donkey%2Fisbn%2F9780545261241.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
20687
Avoid chaining critical requests — 3 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Alibris.com should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
Keep request counts low and transfer sizes small — 115 requests • 836 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
115
855833
Script
30
448238
Image
40
311917
Stylesheet
1
36169
Other
40
29514
Document
3
27349
Font
1
2646
Media
0
0
Third-party
106
762744
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Largest Contentful Paint image was not lazily loaded
Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint.
Element
Avoid large layout shifts
Below is a list of all DOM elements that contribute to the CLS of the page.
Uses passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks — 17 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://www.alibris.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js
10910
373
https://ssl.google-analytics.com/ga.js
8040
265
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/javascript/main-mobile.js
6180
230
https://www1.alibris-static.com/framework/skins/alibris/js/red.7.185.034.js
7340
226
https://tags.b1js.com/tags/9d8f53cd2b864fa8aa323144431bef11.js
9862
188
https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js
8755
154
https://www.googletagmanager.com/gtag/js?id=G-LVVVEGSLSZ
8611
144
https://www.googletagmanager.com/gtag/js?id=DC-6901668&l=dataLayer&cx=c
9505
121
https://www.google-analytics.com/analytics.js
12213
121
https://m.alibris.com/
3180
115
https://www.googleadservices.com/pagead/conversion.js
12813
82
https://www.googletagmanager.com/gtag/js?id=G-LVVVEGSLSZ
8540
71
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/javascript/main-mobile.js
6410
69
Unattributable
630
60
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/javascript/main-mobile.js
6500
56
https://www.googletagmanager.com/gtm.js?id=GTM-KQ6HMJ
10855
55
https://bat.bing.com/bat.js
12363
55
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of alibris.com on mobile screens.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Other

Network Requests
Below is a list of network requests that were made during page load.
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h2
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https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww1.alibris-static.com%2Fimages%2Fred%2Ffooter%2Ftwitter-60.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
h2
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h2
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Image
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h2
898.98099983111
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3351
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image/webp
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https://opt2.moovweb.net/img?img=https%3A%2F%2Fseal-goldengate.bbb.org%2Fseals%2Fblue-seal-200-42-whitetxt-bbb-17525.png&linkEncoded=0&quality=50&width=420&shrinkonly=1
h2
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Image
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h2
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https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/javascript/main-mobile.js
h2
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https://www.alibris.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js
h2
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h2
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Font
https://ssl.google-analytics.com/ga.js
h2
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text/javascript
Script
https://js.b1js.com/tagcontainer.js?id=9d8f53cd2b864fa8aa323144431bef11&type=1
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application/javascript
Script
https://sealserver.trustwave.com/seal.js?style=invert&code=b8893b161c294f7ba3521f4dfc863652
http/1.1
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Script
https://www.googletagmanager.com/gtag/js?id=G-LVVVEGSLSZ
h2
1173.075999599
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Script
https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js
h2
1173.288999591
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Script
https://www1.alibris-static.com/framework/skins/alibris/js/jquery.hoverIntent.minified.7.185.034.js
h2
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h2
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1889.1209997237
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text/html
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h2
1893.114999868
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image/gif
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https://idsync.rlcdn.com/1000.gif?memo=CLyzGxIsCigIARDovQEaIGU3MTkzYWNiN2FjMjRhNDFhYWYwNjgxODNjMDI4YWIyEAAaDQjp3oeLBhIFCOgHEABCAEoA
http/1.1
1925.5140000023
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text/plain
https://cm.g.doubleclick.net/pixel?google_nid=CPX12&google_cm&google_hm=NzI1MzE0MDM2ODM3NDc3OTQy
http/1.1
1953.3339999616
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1156
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text/html
https://sync.mathtag.com/sync/img?mt_exid=10012&redir=https://tag.crsspxl.com/m.gif?mmid=[MM_UUID]
http/1.1
1953.5529999994
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image/gif
https://match.adsrvr.org/track/cmf/generic?ttd_pid=crosspixel&ttd_tpi=1
http/1.1
1955.4309998639
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text/html
https://ib.adnxs.com/getuid?https://tag.crsspxl.com/m.gif?anid=$UID
http/1.1
1955.7749996893
2058.1679996103
675
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image/gif
Image
https://d.turn.com/r/dd/id/L2NzaWQvMS9jaWQvMTgwMzI0NTAvdC8w/dpuid/725314036837477942/url/https://tag.crsspxl.com/m.gif?tnid=$!{TURN_UUID}
http/1.1
1956.464999821
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0
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text/plain
https://idsync.rlcdn.com/366518.gif?partner_uid=725314036837477942
http/1.1
1956.6559996456
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732
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text/plain
https://tags.bluekai.com/site/18282?phint=id%3D725314036837477942
http/1.1
1956.801999826
2313.2979995571
737
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200
image/gif
Image
https://cms.analytics.yahoo.com/cms?partner_id=CROEL
http/1.1
1956.9729999639
1992.76799988
1449
0
302
text/html
https://blip.bizrate.com/sync?partnerID=cp&partnerUUID=725314036837477942
http/1.1
1957.2099996731
2621.1059996858
682
0
302
text/html
https://pxl.connexity.net/c/cse?a=R&A=227&D=5665&V=9&I0k=ptnrid&I0v=725314036837477942
http/1.1
1957.412999589
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image/gif
Image
https://ce.lijit.com/merge?pid=5110&3pid=725314036837477942
http/1.1
1957.7189995907
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https://u.openx.net/w/1.0/cm?id=d3d03dbd-5946-4cba-8d30-3c0226699028&r=https%3A%2F%2Ftag.crsspxl.com%2Fm.gif%3Foxid%3D
http/1.1
1958.6769999005
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551
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text/plain
https://e.dlx.addthis.com/e/a-1625/s-3300?cb=1633808233474
http/1.1
1960.6059999205
2022.9249997064
464
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text/plain
https://in.xspadvertising.com/ingest/crosspixel.html?k=Books%2CMovies%2CMusic
http/1.1
1964.1189998947
2091.8089998886
103
0
204
text/plain
Document
https://dpm.demdex.net/demconf.jpg?et:ibs%7cdata:dpid=903&dpuuid=6b8f1a76-e891-4c1f-9a69-25cbdad18652&gdpr=0&gdpr_consent=&redir=https%3A%2F%2Fmatch.adsrvr.org%2Ftrack%2Fcmf%2Fgeneric%3Fttd_pid%3Daam
http/1.1
1964.7289998829
2617.4699999392
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text/plain
https://dpm.demdex.net/demconf.jpg?et:ibs%7cdata:dpid=903&dpuuid=a8b9a6b2-0e65-41d1-8b9f-6e7350d349aa&gdpr=0&gdpr_consent=&redir=https%3A%2F%2Fmatch.adsrvr.org%2Ftrack%2Fcmf%2Fgeneric%3Fttd_pid%3Daam
http/1.1
1965.52399965
2037.105999887
920
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text/plain
https://pippio.com/api/sync?pid=5324&it=1&iv=56c1de6a8a285ac8b5dcf0f6d890ba262cbfbd7e22bfab5e2ab9d5533dcdea83791426b5417dce21&_=2
http/1.1
1966.6739995591
2008.7689999491
1031
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307
text/plain
https://tag.crsspxl.com/m.gif?id=&google_gid=CAESEDv4jv8WqSrE6B7c_niDZnk&google_cver=1
http/1.1
1966.8569997884
2038.603999652
253
43
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image/gif
Image
https://u.openx.net/w/1.0/cm?cc=1&id=d3d03dbd-5946-4cba-8d30-3c0226699028&r=https%3A%2F%2Ftag.crsspxl.com%2Fm.gif%3Foxid%3D
http/1.1
1969.3719996139
1982.090999838
585
0
302
image/gif
https://tag.crsspxl.com/m.gif?tdid=6b8f1a76-e891-4c1f-9a69-25cbdad18652
http/1.1
1974.1509999149
2081.106999889
399
43
200
image/gif
Image
https://tag.crsspxl.com/m.gif?tnid=6933879543304867164
http/1.1
1979.7649998218
2092.428999953
385
43
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image/gif
Image
https://tag.crsspxl.com/m.gif?oxid=9bdd9205-17af-4e27-a88d-5106058557ce
http/1.1
1982.556999661
2080.1479998045
253
43
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image/gif
Image
https://tag.crsspxl.com/m.gif?yahoo_id=y-Xmp8M7hE2pPUj_tl8qVan1w9trTzwrm5yG4-~A
http/1.1
1993.1149999611
2103.474999778
253
43
200
image/gif
Image
https://pippio.com/api/sync?pid=5324&it=1&iv=56c1de6a8a285ac8b5dcf0f6d890ba262cbfbd7e22bfab5e2ab9d5533dcdea83791426b5417dce21&_=2
http/1.1
1997.0449996181
2035.5839999393
1016
0
307
text/plain
https://cm.g.doubleclick.net/pixel?google_nid=pippio_dmp&google_cm&google_no_sc&m=CMwpElsKVwgBEJInGlA1NmMxZGU2YThhMjg1YWM4YjVkY2YwZjZkODkwYmEyNjJjYmZiZDdlMjJiZmFiNWUyYWI5ZDU1MzNkY2RlYTgzNzkxNDI2YjU0MTdkY2UyMRAAGgwI6d6HiwYSBAgCEABCAEoA
http/1.1
2009.2879999429
2023.4949998558
985
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text/html
https://e.dlx.addthis.com/e/a-1625/s-3300?cb=1633808233474&rd=Y
http/1.1
2023.3569997363
2086.7249998264
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https://pippio.com/api/sync/ddp?pid=2&m=CMwpElsKVwgBEJInGlA1NmMxZGU2YThhMjg1YWM4YjVkY2YwZjZkODkwYmEyNjJjYmZiZDdlMjJiZmFiNWUyYWI5ZDU1MzNkY2RlYTgzNzkxNDI2YjU0MTdkY2UyMRAAGgwI6d6HiwYSBAgCEABCAEoA&google_gid=CAESEGQXwsx2wW9MPm1SGOjYZ6U&google_cver=1
http/1.1
2023.8239997998
2068.0619999766
535
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text/plain
https://cm.g.doubleclick.net/pixel?google_nid=pippio_dmp&google_cm&google_no_sc&m=CMwpElsKVwgBEJInGlA1NmMxZGU2YThhMjg1YWM4YjVkY2YwZjZkODkwYmEyNjJjYmZiZDdlMjJiZmFiNWUyYWI5ZDU1MzNkY2RlYTgzNzkxNDI2YjU0MTdkY2UyMRAAGgwI6d6HiwYSBAgCEABCAEoA
http/1.1
2036.1279998906
2044.5919996127
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text/html
https://match.adsrvr.org/track/cmf/generic?ttd_pid=aam
http/1.1
2037.4549999833
2059.7639996558
756
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text/html
https://pippio.com/api/sync/ddp?pid=2&m=CMwpElsKVwgBEJInGlA1NmMxZGU2YThhMjg1YWM4YjVkY2YwZjZkODkwYmEyNjJjYmZiZDdlMjJiZmFiNWUyYWI5ZDU1MzNkY2RlYTgzNzkxNDI2YjU0MTdkY2UyMRAAGgwI6d6HiwYSBAgCEABCAEoA&google_gid=CAESEGQXwsx2wW9MPm1SGOjYZ6U&google_cver=1
http/1.1
2045.1849997044
2087.838999927
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https://dpm.demdex.net/ibs:dpid=903&dpuuid=6b8f1a76-e891-4c1f-9a69-25cbdad18652
http/1.1
2060.3329995647
2143.5179999098
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image/gif
Image
https://usermatch.krxd.net/um/v2?partner=liveramp_identity
http/1.1
2068.5089998879
2086.1199996434
328
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text/plain
https://beacon.krxd.net/usermatch.gif?kuid_status=new&partner=liveramp_identity
h2
2086.4789998159
2103.2969998196
444
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text/plain
Image
https://stags.bluekai.com/site/1407?partner=1&uhint=na_id=2021100919371300038974899993&redir=https%3A%2F%2Fx.dlx.addthis.com%2Fe%2Fbk_sync.xgi%3Fna_exid%3D%24_BK_UUID
http/1.1
2087.0669996366
2238.8619999401
869
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text/plain
https://usermatch.krxd.net/um/v2?partner=liveramp_identity
http/1.1
2088.3959997445
2105.877999682
328
0
302
text/plain
https://ce.lijit.com/merge?pid=5110&3pid=725314036837477942&dnr=1
http/1.1
2095.9969996475
2228.0419999734
433
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204
text/plain
Image
https://beacon.krxd.net/usermatch.gif?kuid_status=new&partner=liveramp_identity
h2
2106.5769996494
2123.018999584
444
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204
text/plain
Image
https://tag.crsspxl.com/m.gif?mmid=1ed66161-ef69-4100-83b5-b4d574f6094d
http/1.1
2111.0629998147
2183.6829995736
253
43
200
image/gif
Image
https://x.dlx.addthis.com/e/bk_sync.xgi?na_exid=%2FnBv1nhf999VbZaC
h2
2239.3679996021
2492.7619998343
902
43
200
image/gif
Image
https://match.adsrvr.org/track/cmf/generic?ttd_pid=aam
http/1.1
2619.0609997138
2640.0389997289
756
0
302
text/html
https://tag.crsspxl.com/s.gif?cnxid=16338082340598927299709990099002649
http/1.1
2621.5339996852
2705.2429998294
142
43
200
image/gif
Image
https://dpm.demdex.net/ibs:dpid=903&dpuuid=6b8f1a76-e891-4c1f-9a69-25cbdad18652
http/1.1
2640.6329995953
2712.0159999467
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image/gif
Image
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
903.606
9.449
917.41
7.382
924.9
7.258
933.569
5.971
1033.865
7.972
1043.21
57.622
1102.076
114.761
1229.365
17.239
1246.633
10.253
1256.902
13.984
1278.256
5.104
1305.675
66.238
1421.173
56.531
1477.722
38.533
1517.32
5.902
1523.234
17.697
1546.444
35.972
1582.478
5.761
1592.578
9.432
1605.693
5.545
1613.602
13.625
1631.437
93.19
1725.084
5.559
1732.689
15.092
1753.481
30.139
1787.509
30.15
1817.768
13.661
1831.477
46.931
1895.324
20.459
1971.373
8.181
1983.984
7.014
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Metrics

Speed Index — 5.0 s
The time taken for the page contents to be visibly populated.

Opportunities

Eliminate render-blocking resources — Potential savings of 790 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Alibris.com should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/stylesheets/.css/devices/mobile.css
36169
930
Minify JavaScript — Potential savings of 22 KiB
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Alibris.com should consider minifying JS files.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/javascript/main-mobile.js
85768
22546

Diagnostics

Reduce JavaScript execution time — 2.6 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/javascript/main-mobile.js
625.936
512.34
24.516
https://www.alibris.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js
553.752
510.4
21.296
Unattributable
532.528
14.12
0.7
https://m.alibris.com/
488.888
66.3
7.952
https://ssl.google-analytics.com/ga.js
266.572
259.728
4.176
https://www1.alibris-static.com/framework/skins/alibris/js/red.7.185.034.js
253.776
251.692
0.904
https://www.googletagmanager.com/gtag/js?id=G-LVVVEGSLSZ
217.056
195.476
14.972
https://tags.b1js.com/tags/9d8f53cd2b864fa8aa323144431bef11.js
187.724
182.748
1.296
https://www.google-analytics.com/analytics.js
141.244
125.224
4.484
https://www.googletagmanager.com/gtag/js?id=DC-6901668&l=dataLayer&cx=c
122.584
110.464
8.136
https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js
109.368
77.808
21.244
https://www.googletagmanager.com/gtm.js?id=GTM-KQ6HMJ
71.816
48.668
14.736
https://www.googleadservices.com/pagead/conversion.js
67.592
60.96
4.372
https://tag.crsspxl.com/s2.html?d=2453&t=Alibris%20-%20Buy%20new%20and%20used%20books%2C%20textbooks%2C%20music%20and%20movies&u=https%3A%2F%2Fm.alibris.com%2F&b2=%20%20%20%20%20%20%20
65.912
7.6
4.932
Minimize main-thread work — 3.9 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
2553.452
Other
636.744
Style & Layout
274.676
Script Parsing & Compilation
158.208
Parse HTML & CSS
147.34
Rendering
81.016
Garbage Collection
60.148

Metrics

First Contentful Paint — 4.1 s
The time taken for the first image or text on the page to be rendered.
Largest Contentful Paint — 6.0 s
The timing of the largest text or image that is painted.
Time to Interactive — 11.4 s
The time taken for the page to become fully interactive.
Total Blocking Time — 1,170 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Other

Max Potential First Input Delay — 370 ms
Users could experience a delay when interacting with the page.
First Meaningful Paint — 4.5 s
The time taken for the primary content of the page to be rendered.
First Contentful Paint (3G) — 7980 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.

Opportunities

Properly size images — Potential savings of 17 KiB
Images can slow down the page's load time. Alibris.com should consider serving more appropriate-sized images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://m.alibris.com/images/promos/red/fall-2021/2021_homepage_banner_fall.jpg
46603
17702
Reduce unused CSS — Potential savings of 34 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Alibris.com should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/stylesheets/.css/devices/mobile.css
36169
34677
Reduce unused JavaScript — Potential savings of 145 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js
69065
59867
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/javascript/main-mobile.js
85768
41190
https://www.googletagmanager.com/gtag/js?id=G-LVVVEGSLSZ
62095
26069
https://www.googletagmanager.com/gtag/js?id=DC-6901668&l=dataLayer&cx=c
38532
21283
Serve images in next-gen formats — Potential savings of 89 KiB
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/images/sprites.png
155204
91424.3
Avoid multiple page redirects — Potential savings of 2,220 ms
Redirects can cause additional delays before the page can begin loading. Alibris.com should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://alibris.com/
630
https://alibris.com/
480
http://www.alibris.com/
630
https://www.alibris.com/
480
https://m.alibris.com/
0

Diagnostics

Serve static assets with an efficient cache policy — 41 resources found
Alibris.com can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://js.b1js.com/tagcontainer.js?id=9d8f53cd2b864fa8aa323144431bef11&type=1
0
3547
https://sealserver.trustwave.com/seal_image.php?customerId=b8893b161c294f7ba3521f4dfc863652&size=105x54&style=invert
0
2084
https://tag.crsspxl.com/s1.js?d=2453&cb=1633808233171
0
1466
https://sealserver.trustwave.com/seal.js?style=invert&code=b8893b161c294f7ba3521f4dfc863652
0
975
https://tags.bluekai.com/site/18282?phint=id%3D725314036837477942
0
737
https://tag.crsspxl.com/m.gif?tdid=6b8f1a76-e891-4c1f-9a69-25cbdad18652
0
399
https://tag.crsspxl.com/m.gif?tnid=6933879543304867164
0
385
https://b1img.com/js_container?site_id=9d8f53cd2b864fa8aa323144431bef11&type=1&callback=b1Ctn.parseUuidResponse
0
368
https://b1img.com/9d8f53cd2b864fa8aa323144431bef11/cs_tag/?ids=2836625,16707011,17221140,17751451,2783938,14216518
0
274
https://tag.crsspxl.com/m.gif?id=&google_gid=CAESEDv4jv8WqSrE6B7c_niDZnk&google_cver=1
0
253
https://tag.crsspxl.com/m.gif?mmid=1ed66161-ef69-4100-83b5-b4d574f6094d
0
253
https://tag.crsspxl.com/m.gif?oxid=9bdd9205-17af-4e27-a88d-5106058557ce
0
253
https://tag.crsspxl.com/m.gif?yahoo_id=y-Xmp8M7hE2pPUj_tl8qVan1w9trTzwrm5yG4-~A
0
253
https://tag.crsspxl.com/s.gif?cnxid=16338082340598927299709990099002649
0
142
https://tags.b1js.com/tags/9d8f53cd2b864fa8aa323144431bef11.js
3600000
6332
https://cdn.granify.com/assets/javascript.js?id=1205&v=2021109
3600000
1148
https://www.google-analytics.com/analytics.js
7200000
20399
https://ssl.google-analytics.com/ga.js
7200000
17758
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14400000
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14400000
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14400000
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14400000
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https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww3.alibris-static.com%2Fimages%2Fred%2Ffooter%2Flogo-footer.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
14400000
4135
https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww1.alibris-static.com%2Fimages%2Fred%2Ffooter%2Ftwitter-60.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
14400000
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https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww1.alibris-static.com%2Fimages%2Fred%2Ffooter%2Ffacebook-60.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
14400000
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https://opt2.moovweb.net/img?img=https%3A%2F%2Fseal-goldengate.bbb.org%2Fseals%2Fblue-seal-200-42-whitetxt-bbb-17525.png&linkEncoded=0&quality=50&width=420&shrinkonly=1
14400000
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https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww2.alibris-static.com%2Fimages%2Fred%2Ffooter%2Fblog-60.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
14400000
3008
https://www1.alibris-static.com/framework/skins/alibris/js/red.7.185.034.js
14400000
2151
https://www3.alibris-static.com/framework/skins/alibris/js/complete.7.185.034.js
14400000
1670
https://www0.alibris-static.com/framework/skins/alibris/js/jquery.menu-aim.7.185.034.js
14400000
1573
https://www1.alibris-static.com/framework/skins/alibris/js/web.7.185.034.js
14400000
1568
https://www1.alibris-static.com/framework/skins/alibris/js/jquery.hoverIntent.minified.7.185.034.js
14400000
1291
https://static.cloudflareinsights.com/beacon.min.js
86400000
5568
https://www.alibris.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js
172800000
4421
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/images/sprites.png
604800000
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604800000
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https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/stylesheets/.css/devices/mobile.css
604800000
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604800000
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https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/images/alibris-logo.gif
604800000
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604800000
2172
Avoid an excessive DOM size — 2,283 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
2283
Maximum DOM Depth
24
Maximum Child Elements
36
Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/images/fonts/Alibris-Icons.woff
61.426000203937
Reduce the impact of third-party code — Third-party code blocked the main thread for 680 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
39958
265.648
381388
229.984
157503
149.904
69065
26.844
24259
8.728
11311
0
11297
0
5525
0
4906
0
3900
0
3102
0
2767
0
2612
0
2220
0
1953
0
1606
0
1545
0
1544
0
1463
0
1449
0
1136
0
999
0
682
0
613
0
518
0
Image elements do not have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.
URL Failing Elements
https://m.alibris.com/images/promos/red/fall-2021/2021_homepage_banner_fall.jpg
https://opt2.moovweb.net/img?img=https%3A%2F%2Fseal-goldengate.bbb.org%2Fseals%2Fblue-seal-200-42-whitetxt-bbb-17525.png&linkEncoded=0&quality=50&width=420&shrinkonly=1
https://assets.moovweb.net/2180673c-bb7b-47f8-b173-f3b22521b675/3ad34193-439d-4394-afea-bc53a8af0c51/v157/images/alibris-logo.gif
https://sealserver.trustwave.com/seal_image.php?customerId=b8893b161c294f7ba3521f4dfc863652&size=105x54&style=invert
https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww3.alibris-static.com%2Fimages%2Fred%2Ffooter%2Flogo-footer.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww1.alibris-static.com%2Fimages%2Fred%2Ffooter%2Ffacebook-60.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww1.alibris-static.com%2Fimages%2Fred%2Ffooter%2Ftwitter-60.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww0.alibris-static.com%2Fimages%2Fred%2Ffooter%2Fpintrest-60.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww2.alibris-static.com%2Fimages%2Fred%2Ffooter%2Fblog-60.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
88

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of alibris.com. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Alibris.com may provide assistance to deaf or hearing-impaired users with captions on videos.

Contrast

Names and labels

Links do not have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

Best practices

`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.
Failing Elements

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
60

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that alibris.com should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
Bootstrap
3.3.7
jQuery
3.4.1
jQuery UI
1.12.1
Modernizr
2.6.2
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 2 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://alibris.com/
Allowed
http://www.alibris.com/
Allowed
Links to cross-origin destinations are unsafe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Includes front-end JavaScript libraries with known security vulnerabilities — 7 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Library Version Vulnerability Count Highest Severity
5
Medium
2
Medium

Audits

Serves images with low resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
URL Displayed size Actual size Expected size
https://opt2.moovweb.net/img?img=https%3A%2F%2Fwww1.alibris-static.com%2Fatomic-habits-an-easy-proven-way-to-build-good-habits-break-bad-ones%2Fisbn%2F9780735211292.gif&linkEncoded=0&quality=50&width=420&shrinkonly=1
90 x 136
124 x 187
180 x 272

Audits

Page lacks the HTML doctype, thus triggering quirks-mode
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.

Audits

Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Source Description
Failed to load resource: the server responded with a status of 403 (Forbidden)
Failed to load resource: the server responded with a status of 404 (Not Found)
86

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for alibris.com. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of alibris.com on mobile screens.
Tap targets are sized appropriately — 100% appropriately sized tap targets
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Links do not have descriptive text — 4 links found
Make use of descriptive link text to assist search engines in understanding the content.

Mobile Friendly

Document doesn't use legible font sizes — 56.13% legible text
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Source Selector % of Page Text Font Size
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video
43.87%
10px
56.13%
≥ 12px

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
50

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of alibris.com. This includes details about web app manifests.

PWA Optimized

Redirects HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of alibris.com on mobile screens.
Provides a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.

Installable

Web app manifest or service worker do not meet the installability requirements — 1 reason
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
Failure reason
No manifest was fetched

PWA Optimized

Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Hosting

Server Location

Server IP Address: 104.16.136.245
Continent: North America
Country: United States
United States Flag
Region:
City:
Longitude: -97.822
Latitude: 37.751
Currencies: USD
USN
USS
Languages: English

Web Hosting Provider

Name IP Address
Cloudflare, Inc.
Registration

Domain Registrant

Private Registration: No
Name:
Organization: Alibris
Country: US
City:
State: California
Post Code:
Email:
Phone:
Note: Registration information is derived from various sources and may be inaccurate.

Domain Registrar

Name IP Address
GoDaddy.com, LLC 104.67.4.19
Security

Visitor Safety

Mature Content: Not Likely
McAfee WebAdvisor Rating: Safe
WOT Rating:
WOT Trustworthiness: 92/100
WOT Child Safety: 93/100
Note: Safety information is not guaranteed.

SSL/TLS Certificate

Issued To: www.alibris.com
Issued By: Go Daddy Secure Certificate Authority - G2
Valid From: 8th January, 2021
Valid To: 21st December, 2021
Subject: CN = www.alibris.com
Hash: ee7abfd4
Issuer: CN = Go Daddy Secure Certificate Authority - G2
OU = http://certs.godaddy.com/repository/
O = GoDaddy.com, Inc.
S = US
Version: 2
Serial Number: 6637082952579900421
Serial Number (Hex): 5C1BA7C7D5536405
Valid From: 8th January, 2024
Valid To: 21st December, 2024
Signature Algorithm (Short Name): RSA-SHA256
Signature Algorithm (Long Name): sha256WithRSAEncryption
Authority Key Identifier: keyid:40:C2:BD:27:8E:CC:34:83:30:A2:33:D7:FB:6C:B3:F0:B4:2C:80:CE
Extended Key Usage: TLS Web Server Authentication, TLS Web Client Authentication
CRL Distribution Points:
Full Name:
URI:http://crl.godaddy.com/gdig2s1-2598.crl

Certificate Policies: Policy: 2.16.840.1.114413.1.7.23.1
CPS: http://certificates.godaddy.com/repository/
Policy: 2.23.140.1.2.1

Authority Information Access: OCSP - URI:http://ocsp.godaddy.com/
CA Issuers - URI:http://certificates.godaddy.com/repository/gdig2.crt

SCT List: Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : F6:5C:94:2F:D1:77:30:22:14:54:18:08:30:94:56:8E:
E3:4D:13:19:33:BF:DF:0C:2F:20:0B:CC:4E:F1:64:E3
Timestamp : Jan 8 19:08:29.952 2021 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:21:00:86:6C:C7:4B:A3:40:89:A2:B6:20:82:
88:C7:0A:62:E2:FE:0C:10:CA:CD:78:E0:28:CD:D1:59:
3C:13:5D:43:EB:02:20:3D:1E:75:33:DD:09:58:BB:8D:
48:FC:2F:31:ED:05:9D:DC:2C:2B:73:0C:8D:99:17:E8:
7F:81:64:43:03:F0:23
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 5C:DC:43:92:FE:E6:AB:45:44:B1:5E:9A:D4:56:E6:10:
37:FB:D5:FA:47:DC:A1:73:94:B2:5E:E6:F6:C7:0E:CA
Timestamp : Jan 8 19:08:30.264 2021 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:46:02:21:00:95:1F:11:82:D3:4B:58:8C:11:B6:66:
CC:22:E8:27:FF:E2:59:A8:2F:D4:49:A8:00:A2:72:57:
95:9A:D3:90:A6:02:21:00:FE:91:CE:82:F8:B9:36:29:
5E:80:FA:14:A9:CE:91:0E:BF:EC:F4:73:F3:E6:37:35:
F0:8C:A7:08:0B:C1:6A:E5
Key Usage: Digital Signature, Key Encipherment
Basic Constraints: CA:FALSE
Subject Alternative Name: DNS:alibris.com
DNS:catalog.alibris.com
DNS:extranet.alibris.com
DNS:images.alibris.com
DNS:images.alibris.net
DNS:libraries.alibris.com
DNS:library.alibris.com
DNS:mail.alibris.com
DNS:mail.alibris.net
DNS:match.alibris.com
DNS:orderapi.alibris.com
DNS:partnerorders.alibris.com
DNS:prod1.alibris.com
DNS:prod1.alibris.net
DNS:prod2.alibris.com
DNS:prod2.alibris.net
DNS:rwprdexch05.alibris.net
DNS:rwprdexch06.alibris.net
DNS:rwprdexch10.alibris.net
DNS:rwprdexch11.alibris.net
DNS:sellers.alibris.com
DNS:services.alibris.com
DNS:vpn.alibris.com
DNS:www.alibris-test.com
DNS:www.alibris.co.uk
DNS:www.alibristest.com
DNS:www.alibris.com
Technical

DNS Lookup

HTTP Response Headers

HTTP-Code: HTTP/1.1 200 OK
Date: 9th October, 2021
Content-Type: text/html; charset=ISO-8859-1
Server: cloudflare
Connection: keep-alive
Set-Cookie: *
X-Powered-By: Servlet/2.5 JSP/2.1
X-Frame-Options: SAMEORIGIN
X-Xss-Protection: 1
X-Content-Type-Options: nosniff
Strict-Transport-Security: max-age=2592000
set-cookie: *
CF-Cache-Status: DYNAMIC
Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
CF-RAY: 69ba0f2b6c1a190e-EWR
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400, h3-28=":443"; ma=86400, h3-27=":443"; ma=86400

Whois Lookup

Created: 1st April, 1998
Changed: 16th May, 2019
Expires: 30th March, 2024
Registrar: GoDaddy.com, LLC
Status: clientTransferProhibited
clientUpdateProhibited
clientRenewProhibited
clientDeleteProhibited
Nameservers: ns4.alibris.com
ns5.alibris.com
Owner Organization: Alibris
Owner State: California
Owner Country: US
Owner Email: Select Contact Domain Holder link at https://www.godaddy.com/whois/results.aspx?domain=alibris.com
Admin Email: Select Contact Domain Holder link at https://www.godaddy.com/whois/results.aspx?domain=alibris.com
Tech Email: Select Contact Domain Holder link at https://www.godaddy.com/whois/results.aspx?domain=alibris.com
Full Whois: Domain Name: alibris.com
Registry Domain ID: 5215853_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.godaddy.com
Registrar URL: http://www.godaddy.com
Updated Date: 2019-05-16T01:13:40Z
Creation Date: 1998-04-01T00:00:00Z
Registrar Registration Expiration Date: 2024-03-30T23:00:00Z
Registrar: GoDaddy.com, LLC
Registrar IANA ID: 146
Registrar Abuse Contact Email: abuse@godaddy.com
Registrar Abuse Contact Phone: +1.4806242505
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Domain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Registrant Organization: Alibris
Registrant State/Province: California
Registrant Country: US
Registrant Email: Select Contact Domain Holder link at https://www.godaddy.com/whois/results.aspx?domain=alibris.com
Tech Email: Select Contact Domain Holder link at https://www.godaddy.com/whois/results.aspx?domain=alibris.com
Admin Email: Select Contact Domain Holder link at https://www.godaddy.com/whois/results.aspx?domain=alibris.com
Name Server: NS5.ALIBRIS.COM
Name Server: NS4.ALIBRIS.COM
DNSSEC: unsigned
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of WHOIS database: 2021-10-09T19:36:43Z <<<
For more information on Whois status codes, please visit https://icann.org/epp

TERMS OF USE: The data contained in this registrar's Whois database, while believed by the
registrar to be reliable, is provided "as is" with no guarantee or warranties regarding its
accuracy. This information is provided for the sole purpose of assisting you in obtaining
information about domain name registration records. Any use of this data for any other purpose
is expressly forbidden without the prior written permission of this registrar. By submitting
an inquiry, you agree to these terms and limitations of warranty. In particular, you agree not
to use this data to allow, enable, or otherwise support the dissemination or collection of this
data, in part or in its entirety, for any purpose, such as transmission by e-mail, telephone,
postal mail, facsimile or other means of mass unsolicited, commercial advertising or solicitations
of any kind, including spam. You further agree not to use this data to enable high volume, automated
or robotic electronic processes designed to collect or compile this data for any purpose, including
mining this data for your own personal or commercial purposes. Failure to comply with these terms
may result in termination of access to the Whois database. These terms may be subject to modification
at any time without notice.

Nameservers

Name IP Address
ns4.alibris.com 162.159.0.133
ns5.alibris.com 162.159.1.133
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