Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
apollo.archive.org/js/container_7cLc1b4U.js	21600.0 s	127.2 KiB
archive.org/includes/build/js/donation-banner.min.js?v=dd67c3ca	21600.0 s	71.6 KiB
archive.org/components/npm/@babel/polyfill/dist/polyfill.min.js	21600.0 s	39.7 KiB
archive.org/includes/jquery-1.10.2.min.js	21600.0 s	38.6 KiB
archive.org/includes/fonts/Iconochive-Regular.woff	21600.0 s	28.7 KiB
openlibrary.org/static/images/onboarding/volunteer.png	3600.0 s	19.7 KiB
/view_archive.php?archive=/5/items/m_covers_0012/m_covers...	10800.0 s	20.8 KiB
/view_archive.php?archive=/4/items/m_covers_0008/m_covers...	10800.0 s	19.5 KiB
/view_archive.php?archive=/5/items/m_covers_0012/m_covers...	10800.0 s	18.4 KiB
/view_archive.php?archive=/10/items/m_covers_0011/m_cover...	10800.0 s	18.4 KiB
/view_archive.php?archive=/5/items/m_covers_0012/m_covers...	10800.0 s	16.2 KiB
/view_archive.php?archive=/4/items/m_covers_0008/m_covers...	10800.0 s	15.0 KiB
/view_archive.php?archive=/5/items/m_covers_0012/m_covers...	10800.0 s	12.0 KiB
/view_archive.php?archive=/4/items/m_covers_0008/m_covers...	10800.0 s	11.8 KiB
/view_archive.php?archive=/4/items/m_covers_0008/m_covers...	10800.0 s	11.6 KiB
openlibrary.org/static/images/ia-logo.svg	3600.0 s	9.4 KiB
/view_archive.php?archive=/4/items/m_covers_0008/m_covers...	10800.0 s	9.4 KiB
openlibrary.org/static/images/openlibrary-logo-tighter.svg	3600.0 s	7.7 KiB
openlibrary.org/images/ajax-loader-bar.gif	3600.0 s	7.3 KiB
openlibrary.org/static/images/onboarding/feedback.png	3600.0 s	5.7 KiB
openlibrary.org/static/images/onboarding/fulltext.png	3600.0 s	5.1 KiB
archive.org/includes/athena.js	21600.0 s	6.4 KiB
openlibrary.org/static/images/categories/children.svg	3600.0 s	4.8 KiB
openlibrary.org/static/images/categories/art.svg	3600.0 s	4.6 KiB
openlibrary.org/static/images/onboarding/librarian.png	3600.0 s	4.5 KiB
openlibrary.org/static/images/categories/textbooks.svg	3600.0 s	4.4 KiB
openlibrary.org/static/images/categories/medicine.svg	3600.0 s	4.2 KiB
openlibrary.org/static/images/onboarding/library_explorer.png	3600.0 s	4.2 KiB
archive.org/components/donation-banner/banner.css?v=dd67c3ca	21600.0 s	5.0 KiB
openlibrary.org/static/images/categories/science.svg	3600.0 s	3.5 KiB
openlibrary.org/static/images/icons/barcode_scanner.svg	3600.0 s	3.1 KiB
openlibrary.org/static/images/onboarding/read.png	3600.0 s	3.0 KiB
openlibrary.org/static/images/categories/history.svg	3600.0 s	3.0 KiB
openlibrary.org/static/images/ajax-loader.gif	3600.0 s	2.7 KiB
openlibrary.org/static/images/categories/religion.svg	3600.0 s	2.6 KiB
openlibrary.org/static/images/categories/plays.svg	3600.0 s	2.4 KiB
openlibrary.org/cdn/archive.org/athena.js	86400.0 s	4.6 KiB
/components/donation-banner/banner-template-styles/chevro...	21600.0 s	2.7 KiB
openlibrary.org/static/images/categories/mystery_and_detective_stories.svg	3600.0 s	2.1 KiB
openlibrary.org/static/images/onboarding/track.png	3600.0 s	2.0 KiB
openlibrary.org/cdn/archive.org/donate.js	86400.0 s	3.8 KiB
archive.org/components/donation-banner/images/close-circle-dark.svg	21600.0 s	2.3 KiB
archive.org/components/donation-banner/images/close-circle-white.svg	21600.0 s	2.3 KiB
openlibrary.org/static/images/categories/biographies.svg	3600.0 s	1.7 KiB
openlibrary.org/static/images/categories/romance.svg	3600.0 s	1.7 KiB
openlibrary.org/static/images/categories/music.svg	3600.0 s	1.6 KiB
openlibrary.org/static/images/onboarding/reading_goal.svg	3600.0 s	1.5 KiB
openlibrary.org/static/images/language-icon.svg	3600.0 s	1.4 KiB
openlibrary.org/static/images/categories/science_fiction.svg	3600.0 s	1.4 KiB
openlibrary.org/static/images/categories/recipes.svg	3600.0 s	1.4 KiB
openlibrary.org/static/images/github.svg	3600.0 s	1.1 KiB
openlibrary.org/static/images/icons/read%20aloud.svg	3600.0 s	1.1 KiB
openlibrary.org/static/images/categories/fantasy.svg	3600.0 s	1.1 KiB
openlibrary.org/static/images/bsky.svg	3600.0 s	996 B
openlibrary.org/static/images/icons/icon_slick-arrow-right.svg	3600.0 s	732 B
openlibrary.org/static/images/icons/octicon-link-external-24.svg	3600.0 s	712 B
openlibrary.org/static/images/search-icon.svg	3600.0 s	639 B
openlibrary.org/static/images/tweet.svg	3600.0 s	635 B
openlibrary.org/static/images/hamburger-icon.svg	3600.0 s	548 B
openlibrary.org/static/images/down-arrow.png	3600.0 s	327 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.27169400000000016] map[node:map[boundingRect:map[bottom:3869 height:3522 left:145 right:1205 top:347 width:1060] lhId:page-12-MAIN nodeLabel:Welcome to Open Library Previous Read Free Library Books Online Millions of b… path:1,HTML,1,BODY,8,MAIN selector:body.client-js > main#test-body-mobile snippet:<main id="test-body-mobile"> type:node] score:0.05654 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:245 height:22 left:145 right:305 top:224 width:160] lhId:page-27-IMG nodeLabel:Internet Archive logo path:1,HTML,1,BODY,5,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.page-banner > div.iaBar > a.iaLogo > img snippet:<img alt="Internet Archive logo" src="/static/images/ia-logo.svg" width="160"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:3869 height:3522 left:145 right:1205 top:347 width:1060] lhId:page-12-MAIN nodeLabel:Welcome to Open Library Previous Read Free Library Books Online Millions of b… path:1,HTML,1,BODY,8,MAIN selector:body.client-js > main#test-body-mobile snippet:<main id="test-body-mobile"> type:node] score:0.054245 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:245 height:22 left:145 right:305 top:224 width:160] lhId:page-27-IMG nodeLabel:Internet Archive logo path:1,HTML,1,BODY,5,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.page-banner > div.iaBar > a.iaLogo > img snippet:<img alt="Internet Archive logo" src="/static/images/ia-logo.svg" width="160"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:3869 height:3522 left:145 right:1205 top:347 width:1060] lhId:page-12-MAIN nodeLabel:Welcome to Open Library Previous Read Free Library Books Online Millions of b… path:1,HTML,1,BODY,8,MAIN selector:body.client-js > main#test-body-mobile snippet:<main id="test-body-mobile"> type:node] score:0.048714 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:245 height:22 left:145 right:305 top:224 width:160] lhId:page-27-IMG nodeLabel:Internet Archive logo path:1,HTML,1,BODY,5,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.page-banner > div.iaBar > a.iaLogo > img snippet:<img alt="Internet Archive logo" src="/static/images/ia-logo.svg" width="160"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-4-DIV nodeLabel: Loading carousel Failed to fetch carousel. Re… path: selector:div.lazy-carousel snippet:<div class="lazy-carousel" data-config="{"query": "ddc:8* first_publish_year:[* TO 1950] publish_year:[2000 TO *] …"> type:node] score:0.011088 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:4091 height:35 left:781 right:816 top:4056 width:35] lhId:page-23-IMG nodeLabel:div > aside > a.footer-icon > img path:1,HTML,1,BODY,11,FOOTER,0,DIV,0,DIV,3,DIV,2,ASIDE,0,A,0,IMG selector:div > aside > a.footer-icon > img snippet:<img src="/static/images/bsky.svg" alt="" loading="lazy"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:3869 height:3522 left:145 right:1205 top:347 width:1060] lhId:page-12-MAIN nodeLabel:Welcome to Open Library Previous Read Free Library Books Online Millions of b… path:1,HTML,1,BODY,8,MAIN selector:body.client-js > main#test-body-mobile snippet:<main id="test-body-mobile"> type:node] score:0.00933 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:245 height:22 left:145 right:305 top:224 width:160] lhId:page-27-IMG nodeLabel:Internet Archive logo path:1,HTML,1,BODY,5,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.page-banner > div.iaBar > a.iaLogo > img snippet:<img alt="Internet Archive logo" src="/static/images/ia-logo.svg" width="160"> type:node]]] type:subitems]]]

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
archive.org/includes/fonts/Iconochive-Regular.woff	200 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:44.648 source:map[type:text value:[unattributed]]]]

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG

nodeLabel: Becoming attached

path: 1,HTML,1,BODY,8,MAIN,1,DIV,2,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,5,DIV,0,DIV,0,A,0,IMG

selector: div.book > div.book-cover > a > img.bookcover

snippet: <img class="bookcover" loading="lazy" alt="Becoming attached" src="//covers.openlibrary.org/b/id/8788253-M.jpg">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
/static/build/css/page-home.css?v=26497e281d076c08a8ce6d9...	9.0 KiB
openlibrary.org/static/build/css/tokens.css?v=ead7e2b204f0e69876050eb27ea65993	2.4 KiB	159 ms

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
Metamorphosis `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15200982-M.jpg	25.7 KiB	21.7 KiB
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/volunteer.png	19.5 KiB	19.0 KiB
Conan by Robert E. Howard `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15178699-M.jpg	22.5 KiB	18.6 KiB
The best romantic ideas `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15206128-M.jpg	22.0 KiB	18.3 KiB
The Time Machine `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15143630-M.jpg	21.7 KiB	17.6 KiB
The imaginary museum of musical works by Lydia Goehr `div.book > div.book-cover > a > img.bookcover`	/view_archive.php?archive=/5/items/m_covers_0012/m_covers...	19.3 KiB	15.5 KiB
Overcoming Anxiety for Dummies `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15213202-M.jpg	18.7 KiB	14.8 KiB
My happy life by Rose Lagercrantz `div.book > div.book-cover > a > img.bookcover`	/view_archive.php?archive=/4/items/m_covers_0008/m_covers...	18.0 KiB	13.5 KiB
Dangerous Liaisons `div.book > div.book-cover > a > img.bookcover`	/view_archive.php?archive=/5/items/m_covers_0012/m_covers...	16.9 KiB	12.5 KiB
The Hitch Hiker's Guide to the Galaxy by Douglas Adams `div.book > div.book-cover > a > img.bookcover`	/view_archive.php?archive=/10/items/m_covers_0011/m_cover...	16.9 KiB	12.4 KiB
Around the World in Eighty Days `div.book > div.book-cover > a > img.bookcover`	/view_archive.php?archive=/5/items/m_covers_0012/m_covers...	14.7 KiB	10.3 KiB
Disney's the little mermaid by Amy Edgar `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/6875249-M.jpg	13.8 KiB	9.4 KiB
Forbidden knowledge by Roger Shattuck `div.book > div.book-cover > a > img.bookcover`	/view_archive.php?archive=/4/items/m_covers_0008/m_covers...	13.4 KiB	9.2 KiB
Your power as a woman `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/6577620-M.jpg	12.8 KiB	8.6 KiB
Encyclopedia of nutrition & cooking by Culinary Arts Institute. `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/7361792-M.jpg	11.0 KiB	6.9 KiB
Girls Can Be Anything by Norma Klein, Roy Doty `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/6691721-M.jpg	10.3 KiB	6.5 KiB
Classic Starts `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/1738958-M.jpg	10.7 KiB	6.4 KiB
Dracula `div.book > div.book-cover > a > img.bookcover`	/view_archive.php?archive=/5/items/m_covers_0012/m_covers...	10.5 KiB	6.1 KiB
Ten Friends by Bruce Goldstone `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/2640456-M.jpg	8.6 KiB	6.1 KiB
Becoming attached by Robert Karen `div.book > div.book-cover > a > img.bookcover`	/view_archive.php?archive=/4/items/m_covers_0008/m_covers...	10.3 KiB	6.0 KiB
The book of blood by H. P. Newquist `div.book > div.book-cover > a > img.bookcover`	/view_archive.php?archive=/4/items/m_covers_0008/m_covers...	10.0 KiB	5.6 KiB
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/feedback.png	5.5 KiB	5.4 KiB
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/fulltext.png	4.9 KiB	4.1 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 90 ms 82.8 KiB

URL	Transfer Size	Est Savings
apollo.archive.org/js/container_7cLc1b4U.js	126.7 KiB	49.8 KiB
openlibrary.org/static/build/js/all.js?v=cccd60a93dcd70f37d029dbeae972d11	101.0 KiB	33.0 KiB

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 3.2 KiB

URL	Transfer Size	Est Savings
/* For changes in this file to take effect you must run m...	4.4 KiB	3.2 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.2 KiB

URL	Transfer Size	Est Savings
openlibrary.org/cdn/archive.org/athena.js	4.4 KiB	2.2 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
Change Website Language `div.language-component > details > summary > img.translate-icon`	openlibrary.org/static/images/language-icon.svg
div > aside > a.footer-icon > img `div > aside > a.footer-icon > img`	openlibrary.org/static/images/bsky.svg
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/feedback.png
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/volunteer.png
Internet Archive logo `div.page-banner > div.iaBar > a.iaLogo > img`	openlibrary.org/static/images/ia-logo.svg
The best romantic ideas `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15206128-M.jpg
The imaginary museum of musical works by Lydia Goehr `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/12659488-M.jpg
Conan by Robert E. Howard `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15178699-M.jpg
Metamorphosis `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15200982-M.jpg
The Time Machine `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15143630-M.jpg
The Time Machine `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15143630-M.jpg
Your power as a woman `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/6577620-M.jpg
Lost Christianities : the battle for Scripture and the faiths we never knew `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/8011068-M.jpg
Forbidden knowledge by Roger Shattuck `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/8295312-M.jpg
Becoming attached `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/8788253-M.jpg
Becoming attached by Robert Karen `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/8788253-M.jpg
Dracula `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/12622155-M.jpg
Dangerous Liaisons `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/12621834-M.jpg
Around the World in Eighty Days `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/12621740-M.jpg
Disney's the little mermaid by Amy Edgar `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/6875249-M.jpg
The Hitch Hiker's Guide to the Galaxy by Douglas Adams `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/11464624-M.jpg
My happy life by Rose Lagercrantz `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/8351540-M.jpg
The book of blood by H. P. Newquist `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/8174154-M.jpg
Classic Starts `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/1738958-M.jpg
Encyclopedia of nutrition & cooking by Culinary Arts Institute. `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/7361792-M.jpg
Understanding social inequality `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/1129099-M.jpg
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/read.png
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/track.png
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/library_explorer.png
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/fulltext.png
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/librarian.png
Overcoming Anxiety for Dummies `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/15213202-M.jpg
Girls Can Be Anything by Norma Klein, Roy Doty `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/6691721-M.jpg
Ten Friends by Bruce Goldstone `div.book > div.book-cover > a > img.bookcover`	covers.openlibrary.org/b/id/2640456-M.jpg
div.slick-track > div.carousel__item > a > img `div.slick-track > div.carousel__item > a > img`	openlibrary.org/static/images/onboarding/reading_goal.svg
div > aside > a.footer-icon > img `div > aside > a.footer-icon > img`	openlibrary.org/static/images/tweet.svg
div > aside > a.footer-icon > img `div > aside > a.footer-icon > img`	openlibrary.org/static/images/github.svg
Loading indicator `div.lazy-carousel > div.loadingIndicator > figure > img`	openlibrary.org/images/ajax-loader-bar.gif
Loading indicator `div.lazy-carousel > div.loadingIndicator > figure > img`	openlibrary.org/images/ajax-loader-bar.gif
Loading indicator `div.lazy-carousel > div.loadingIndicator > figure > img`	openlibrary.org/images/ajax-loader-bar.gif
Loading indicator `div.lazy-carousel > div.loadingIndicator > figure > img`	openlibrary.org/images/ajax-loader-bar.gif
Loading indicator `div.lazy-carousel > div.loadingIndicator > figure > img`	openlibrary.org/images/ajax-loader-bar.gif
additional options menu `div.hamburger-component > details > summary > img.hamburger__icon`	openlibrary.org/static/images/hamburger-icon.svg
The war of the worlds `div.book > div.book-cover > a > img.bookcover`
Miss Peregrine's Home for Peculiar Children `div.book > div.book-cover > a > img.bookcover`
Meditations `div.book > div.book-cover > a > img.bookcover`
Metamorphosis `div.book > div.book-cover > a > img.bookcover`
Digital Fortress `div.book > div.book-cover > a > img.bookcover`
You are the placebo `div.book > div.book-cover > a > img.bookcover`
What Every Body Is Saying `div.book > div.book-cover > a > img.bookcover`
The Prophet `div.book > div.book-cover > a > img.bookcover`
House of Leaves `div.book > div.book-cover > a > img.bookcover`
Grapes of Wrath by John Steinbeck (Twentieth Century Classics) `div.book > div.book-cover > a > img.bookcover`
Untouched Wife `div.book > div.book-cover > a > img.bookcover`
It Ends With Us `div.book > div.book-cover > a > img.bookcover`
Annihilation of caste `div.book > div.book-cover > a > img.bookcover`
Throne of Glass `div.book > div.book-cover > a > img.bookcover`
Madame Bovary `div.book > div.book-cover > a > img.bookcover`
動物農莊 `div.book > div.book-cover > a > img.bookcover`
Frankenstein `div.book > div.book-cover > a > img.bookcover`
Nineteen Eighty-Four `div.book > div.book-cover > a > img.bookcover`
The Water-babies `div.book > div.book-cover > a > img.bookcover`
Death of a Salesman `div.book > div.book-cover > a > img.bookcover`
A Princess of Mars `div.book > div.book-cover > a > img.bookcover`
Just So Stories `div.book > div.book-cover > a > img.bookcover`
The Murder of Roger Ackroyd `div.book > div.book-cover > a > img.bookcover`
The Adventures of Sherlock Holmes `div.book > div.book-cover > a > img.bookcover`
A Christmas Carol `div.book > div.book-cover > a > img.bookcover`
Inferno `div.book > div.book-cover > a > img.bookcover`
Wuthering Heights `div.book > div.book-cover > a > img.bookcover`
Don Quixote `div.book > div.book-cover > a > img.bookcover`
Wuthering Heights by Emily Brontë `div.book > div.book-cover > a > img.bookcover`
Stellaluna by Janell Cannon `div.book > div.book-cover > a > img.bookcover`
Pride and Prejudice by Jane Austen `div.book > div.book-cover > a > img.bookcover`
The Sign of Four by Arthur Conan Doyle `div.book > div.book-cover > a > img.bookcover`
Magister Ludi. by Hermann Hesse `div.book > div.book-cover > a > img.bookcover`
The Adventures of Huckleberry Finn by Mark Twain `div.book > div.book-cover > a > img.bookcover`
Runaway Ralph by Beverly Cleary `div.book > div.book-cover > a > img.bookcover`
Fear no evil by Anatoly Shcharansky `div.book > div.book-cover > a > img.bookcover`
Perspectives in philosophy by Michael Boylan, Robert J. Fogelin `div.book > div.book-cover > a > img.bookcover`
Anthology of modern American poetry by Cary Nelson, Linda K. Kerber, A. Walton … `div.book > div.book-cover > a > img.bookcover`
The Age of Engage by Denise Shiffman `div.book > div.book-cover > a > img.bookcover`
The four seasons of the House of Cerruti by Judith Spencer `div.book > div.book-cover > a > img.bookcover`
Ghost in the machine by Patrick Carman `div.book > div.book-cover > a > img.bookcover`
Popular culture and class conflict 1590-1914 by Eileen Yeo `div.book > div.book-cover > a > img.bookcover`
Ars erotica by Edward Lucie-Smith `div.book > div.book-cover > a > img.bookcover`
Mahatma Gandhi by Mohandas Karamchand Gandhi `div.book > div.book-cover > a > img.bookcover`
Sermons and society by Paul A. Welsby `div.book > div.book-cover > a > img.bookcover`
Religion and the decline of magic by Keith Thomas `div.book > div.book-cover > a > img.bookcover`
Making Room by Christine D. Pohl `div.book > div.book-cover > a > img.bookcover`
Open Library logo `footer > div#footer-content > div#footer-details > img#archive-logo`

More information about the performance of your application. These numbers don't directly affect the Performance score.

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.057
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.054
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.049
Loading carousel Failed to fetch carousel. Re… `div.lazy-carousel`	0.011
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.009
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.009
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.009
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.008
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.007
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.006
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.006
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.005
Your power as a woman `div.slick-track > div.book > div.book-cover > a`	0.005
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.004
Welcome to Open Library Previous Read Free Library Books Online Millions of b… `body.client-js > main#test-body-mobile`	0.004

●Time to Interactive 1.6 s

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 30 ms

●Reduce unused CSS

●Avoids enormous network payloads Total size was 1,062 KiB

●JavaScript execution time 0.1 s

●Minimizes main-thread work 0.8 s

●Avoid non-composited animations 1 animated element found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 150 ms

●Server Backend Latencies 180 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 300 ms

○INP breakdown

○User Timing marks and measures

○Avoid long main-thread tasks

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about input field labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Read Free Library Books Online Millions of books available through Controlled … `div.carousel-container > div.carousel > div.slick-list > div.slick-track`
Borrow Checked Out Borrow Read Preview Only Borrow Read Preview Only Locate Rea… `div.carousel-container > div.carousel > div.slick-list > div.slick-track`
Read Checked Out Read Read Read Read Audiobook Borrow Read Checked Out Borrow B… `div.carousel-container > div.carousel > div.slick-list > div.slick-track`
Borrow Borrow Borrow Borrow Borrow Borrow Borrow Borrow Borrow Borrow Borrow Bo… `div.carousel-container > div.carousel > div.slick-list > div.slick-track`
Borrow Borrow Borrow Borrow Borrow Borrow Borrow Borrow Borrow Borrow Borrow Lo… `div.carousel-container > div.carousel > div.slick-list > div.slick-track`
Art 129,779 Books Science Fiction 20,982 Books Fantasy 14,387 Books Biogr… `div.carousel-container > div.carousel > div.slick-list > div.slick-track`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Home `div > ul > li > a`
Books `div > ul > li > a`
Authors `div > ul > li > a`
Subjects `div > ul > li > a`
Collections `div > ul > li > a`
Developer Center `div > ul > li > a`
API Documentation `div > ul > li > a`
Bulk Data Dumps `div > ul > li > a`
Help Center `div > ul > li > a`
Contact Us `div > ul > li > a`
العربية (ar) `div > ul.locale-options > li > a`
Čeština (cs) `div > ul.locale-options > li > a`
Deutsch (de) `div > ul.locale-options > li > a`
English (en) `div > ul.locale-options > li > a`
Español (es) `div > ul.locale-options > li > a`
Français (fr) `div > ul.locale-options > li > a`
हिंदी (hi) `div > ul.locale-options > li > a`
Hrvatski (hr) `div > ul.locale-options > li > a`
Italiano (it) `div > ul.locale-options > li > a`
Português (pt) `div > ul.locale-options > li > a`
Română (ro) `div > ul.locale-options > li > a`
Sardu (sc) `div > ul.locale-options > li > a`
తెలుగు (te) `div > ul.locale-options > li > a`
Українська (uk) `div > ul.locale-options > li > a`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

●`[role]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Input buttons have discernible text.

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●Select elements have associated label elements.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●ARIA toggle fields have accessible names

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<frame>` or `<iframe>` elements have a title

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
openlibrary.org/about	More

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`