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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

71

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.

RequestCache TTLTransfer Size
www.overdrive.com/Content/img/apps/LibbyDevices2024.png0.0 ms957.1 KiB
www.overdrive.com/Content/img/apps/sora-logo.svg0.0 ms119.1 KiB
www.overdrive.com/Content/img/kanopy/mobile-banner.png0.0 ms108.8 KiB
www.overdrive.com/Content/img/org-educate.png0.0 ms101.0 KiB
www.overdrive.com/Content/img/org-discover.png0.0 ms98.3 KiB
www.overdrive.com/Content/img/org-innovate.png0.0 ms86.3 KiB
www.overdrive.com/Content/fonts/lineto-brown-bold.woff0.0 ms65.5 KiB
www.overdrive.com/Content/fonts/lineto-brown-bolditalic.woff0.0 ms65.1 KiB
www.overdrive.com/Content/fonts/lineto-brown-light.woff0.0 ms64.1 KiB
www.overdrive.com/Content/fonts/lineto-brown-lightitalic.woff0.0 ms63.7 KiB
static.od-cdn.com/lineto-brown-regular.woff0.0 ms62.6 KiB
www.overdrive.com/Content/fonts/2D64F3_3_0.woff20.0 ms54.2 KiB
/ImageType-400/4951-1/{F3D8EEDB-00F5-43D9-B15D-82A44D822E...3600.0 s66.1 KiB
www.overdrive.com/Content/fonts/2D64F3_8_0.woff20.0 ms48.4 KiB
www.overdrive.com/Content/css/icons/icons.data.svg.css0.0 ms47.0 KiB
/ImageType-400/0017-1/{520A10ED-4BCF-4045-88A2-FE58FE23E1...3600.0 s54.8 KiB
/ImageType-400/1209-1/{B12F2C31-1B17-4F5B-8F6F-497E74FB51...3600.0 s49.1 KiB
/ImageType-400/0111-1/{AD23518F-C1C8-4415-A593-FBE7E1C920...3600.0 s45.7 KiB
/ImageType-400/0111-1/{C122A37F-F984-4062-8F35-1072A99305...3600.0 s45.7 KiB
/ImageType-400/0111-1/{440511EC-92F3-4ED7-BD07-A4A2C6ED88...3600.0 s44.2 KiB
/ImageType-400/16996-1/{6E557FF2-B3E5-45E0-9077-EB254B75F...3600.0 s37.1 KiB
/ImageType-400/6852-1/{B544CDC9-A2D2-4794-BDAE-09BD360051...3600.0 s36.7 KiB
/ImageType-400/0017-1/{F6A0CCC2-DF05-4F91-B2D8-CFDF85E636...3600.0 s34.1 KiB
/ImageType-400/2343-1/{E43E10BB-EA82-4098-9794-EC755F02F8...3600.0 s33.1 KiB
/ImageType-400/2363-1/{93848654-336B-4CE0-89B9-14C60FF780...3600.0 s32.4 KiB
www.overdrive.com/Content/img/apps/kanopy-logo.svg0.0 ms24.1 KiB
/ImageType-400/0111-1/CC2/88F/42/{CC288F42-A166-45C9-8DCE...3600.0 s29.0 KiB
/ImageType-400/0017-1/{1B335EFF-A3FF-4C63-B385-BC2C686239...3600.0 s28.4 KiB
/ImageType-400/0111-1/{9B739A94-5608-4846-AFD9-98F0B60BFF...3600.0 s25.9 KiB
/ImageType-400/0439-1/{7A7A296D-89B9-465C-9A6A-39466244CA...3600.0 s20.1 KiB
www.overdrive.com/Content/img/apps/tb-wordmark.svg0.0 ms12.0 KiB
www.overdrive.com/Content/img/apps/libby-logo.svg0.0 ms10.4 KiB
www.overdrive.com/Content/img/apps/tb-logo.svg0.0 ms10.1 KiB
www.overdrive.com/Content/img/apps/libby-wordmark.svg0.0 ms9.0 KiB
www.overdrive.com/Content/img/B-Corp.png0.0 ms8.3 KiB
www.overdrive.com/Content/js/vendor/modernizr.min.js0.0 ms4.5 KiB
www.overdrive.com/Content/js/v2/bundles/All_bundle.js0.0 ms4.1 KiB
www.overdrive.com/Content/img/apps/sora-wordmark.svg0.0 ms4.0 KiB
www.overdrive.com/Content/img/kanopy/kanopy-wordmark-white.svg0.0 ms2.6 KiB
www.overdrive.com/Content/img/apps/kanopy-wordmark.svg0.0 ms2.5 KiB
www.overdrive.com/Content/img/OverDrive_Logo_2020_white.svg0.0 ms1.9 KiB
www.overdrive.com/Content/img/OverDrive_Logo%202020.svg0.0 ms1.7 KiB
www.overdrive.com/Content/img/social/Facebook.svg0.0 ms1.5 KiB
www.overdrive.com/Content/img/social/threads-brands.svg0.0 ms1.3 KiB
www.overdrive.com/Content/img/social/Instagram.svg0.0 ms1.3 KiB
www.overdrive.com/Content/img/icons/svg/OD%20menu%20icon.svg0.0 ms1.3 KiB
www.overdrive.com/Content/img/social/bluesky-brands.svg0.0 ms1.2 KiB
www.overdrive.com/Content/js/v2/bundles/MainNavigationV2_bundle.js0.0 ms1.1 KiB
www.overdrive.com/Content/img/social/LinkedIn.svg0.0 ms1.0 KiB
www.overdrive.com/Content/img/social/youtube.svg0.0 ms1.0 KiB
www.overdrive.com/Content/img/icons/svg/Icon-arrow.svg0.0 ms894 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.

URLEst Savings
www.overdrive.com/Content/fonts/lineto-brown-bold.woff310 ms
www.overdrive.com/Content/fonts/2D64F3_3_0.woff2230 ms
www.overdrive.com/Content/fonts/lineto-brown-light.woff135 ms
www.overdrive.com/Content/fonts/2D64F3_8_0.woff2135 ms
www.overdrive.com/Content/fonts/lineto-brown-lightitalic.woff135 ms
www.overdrive.com/Content/fonts/lineto-brown-bolditalic.woff130 ms
static.od-cdn.com/lineto-brown-regular.woff30 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:36.637 source:map[type:text value:[unattributed]]]]

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.

URLResource SizeEst Savings
div.mobile-banner > div.banner-top > div.banner-image > img.promo-image div.mobile-banner > div.banner-top > div.banner-image > img.promo-image
www.overdrive.com/Content/img/apps/LibbyDevices2024.png956.0 KiB909.0 KiB
main.l-container > div.org-header > div.org-findout > img main.l-container > div.org-header > div.org-findout > img
www.overdrive.com/Content/img/org-educate.png100.4 KiB92.7 KiB
Stream thousands of films for free, thanks to your public library or university… body > div.container > main.l-container > div.kanopy-banner
www.overdrive.com/Content/img/kanopy/mobile-banner.png108.2 KiB90.2 KiB
main.l-container > div.org-header > div.org-findout > img main.l-container > div.org-header > div.org-findout > img
www.overdrive.com/Content/img/org-discover.png97.8 KiB90.1 KiB
main.l-container > div.org-header > div.org-findout > img main.l-container > div.org-header > div.org-findout > img
www.overdrive.com/Content/img/org-innovate.png85.8 KiB78.1 KiB
cover image of Partypooper ul.org-collections > li.insider > a > img
/ImageType-400/4951-1/{F3D8EEDB-00F5-43D9-B15D-82A44D822E...65.6 KiB54.2 KiB
cover image of The Backyard Homestead Book of Building Projects div.title-result > div.title-result__cover > a > img
/ImageType-400/0017-1/{520A10ED-4BCF-4045-88A2-FE58FE23E1...54.4 KiB34.9 KiB
cover image of Safe & Sound div.title-result > div.title-result__cover > a > img
/ImageType-400/1209-1/{B12F2C31-1B17-4F5B-8F6F-497E74FB51...48.7 KiB29.2 KiB
cover image of A Dirty Guide to a Clean Home div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/{AD23518F-C1C8-4415-A593-FBE7E1C920...45.3 KiB25.7 KiB
cover image of Project Hail Mary div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/{C122A37F-F984-4062-8F35-1072A99305...45.2 KiB25.7 KiB
cover image of Heart the Lover ul.org-collections > li.insider > a > img
/ImageType-400/6852-1/{B544CDC9-A2D2-4794-BDAE-09BD360051...36.2 KiB24.8 KiB
cover image of The Home Edit div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/{440511EC-92F3-4ED7-BD07-A4A2C6ED88...43.8 KiB24.3 KiB
cover image of Dungeon Crawler Carl div.title-result > div.title-result__cover > a > img
/ImageType-400/16996-1/{6E557FF2-B3E5-45E0-9077-EB254B75F...36.7 KiB17.2 KiB
cover image of Brimstone ul.org-collections > li.insider > a > img
/ImageType-400/0017-1/{1B335EFF-A3FF-4C63-B385-BC2C686239...28.0 KiB16.6 KiB
cover image of The Night We Met div.title-result > div.title-result__cover > a > img
/ImageType-400/0017-1/{F6A0CCC2-DF05-4F91-B2D8-CFDF85E636...33.6 KiB14.1 KiB
cover image of Dear Debbie div.title-result > div.title-result__cover > a > img
/ImageType-400/2343-1/{E43E10BB-EA82-4098-9794-EC755F02F8...32.6 KiB13.1 KiB
cover image of Mending Matters div.title-result > div.title-result__cover > a > img
/ImageType-400/2363-1/{93848654-336B-4CE0-89B9-14C60FF780...32.0 KiB12.5 KiB
cover image of Good Housekeeping Home Skills div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/CC2/88F/42/{CC288F42-A166-45C9-8DCE...28.6 KiB9.0 KiB
Certified B Corporation div.tablet-logo-block > div.site-footer_b-corp > a > img
www.overdrive.com/Content/img/B-Corp.png7.8 KiB6.4 KiB
cover image of The Correspondent div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/{9B739A94-5608-4846-AFD9-98F0B60BFF...25.5 KiB6.0 KiB

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: div.mobile-banner > div.banner-top > div.banner-image > img.promo-image
path: 1,HTML,1,BODY,2,DIV,1,MAIN,4,DIV,0,DIV,1,DIV,0,IMG
selector: div.mobile-banner > div.banner-top > div.banner-image > img.promo-image
snippet: <img class="promo-image" src="/Content/img/apps/LibbyDevices2024.png" alt="">

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
value: no origins were preconnected
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
value: No additional origins are good candidates for preconnecting

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.

URLTransfer SizeDuration
www.overdrive.com/bundles/css?v=-IuDbwnE6HgkIbSjurlIefG8qAVL0JZsQ132eBe-dJU175.7 KiB452 ms
www.overdrive.com/bundles/Allcss?v=JHIW4pmK6_EeYG-gRuySVLfjoApfKwXFkEjts-A7pHM11.8 KiB
/bundles/MainNavigationV2css?v=biu8vVLoKT1wOKl9g63OMoVrm3...3.7 KiB
www.overdrive.com/Content/js/vendor/modernizr.min.js4.5 KiB

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 983 ms
URLTime Spent
overdrive.com/983 ms
www.overdrive.com/0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

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: 150 ms 15.9 KiB
URLTransfer SizeEst Savings
www.overdrive.com/bundles/css?v=-IuDbwnE6HgkIbSjurlIefG8qAVL0JZsQ132eBe-dJU175.7 KiB15.9 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 600 ms 113.0 KiB
URLTransfer SizeEst Savings
www.overdrive.com/bundles/css?v=-IuDbwnE6HgkIbSjurlIefG8qAVL0JZsQ132eBe-dJU175.2 KiB70.6 KiB
www.overdrive.com/Content/css/icons/icons.data.svg.css46.5 KiB42.3 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 296.5 KiB
URLTransfer SizeEst Savings
www.overdrive.com/bundles/js?v=2gydoUhtk4txS1onfETaiECQZhP-o5fvkYEoj-ZhDkQ1602.7 KiB296.5 KiB

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: 0.0 ms 343.1 KiB
URLTransfer SizeEst Savings
www.overdrive.com/bundles/js?v=2gydoUhtk4txS1onfETaiECQZhP-o5fvkYEoj-ZhDkQ1601.6 KiB343.1 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
www.overdrive.com/Content/img/apps/LibbyDevices2024.png957.1 KiB
www.overdrive.com/bundles/js?v=2gydoUhtk4txS1onfETaiECQZhP-o5fvkYEoj-ZhDkQ1603.6 KiB
www.overdrive.com/Content/img/apps/sora-logo.svg119.1 KiB
www.overdrive.com/Content/img/kanopy/mobile-banner.png108.8 KiB
www.overdrive.com/Content/img/org-educate.png101.0 KiB
www.overdrive.com/Content/img/org-discover.png98.3 KiB
www.overdrive.com/Content/img/org-innovate.png86.3 KiB
www.overdrive.com/bundles/css?v=-IuDbwnE6HgkIbSjurlIefG8qAVL0JZsQ132eBe-dJU175.7 KiB
/ImageType-400/4951-1/{F3D8EEDB-00F5-43D9-B15D-82A44D822E...66.1 KiB
www.overdrive.com/Content/fonts/lineto-brown-bold.woff65.5 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
cover image of Heart the Lover ul.org-collections > li.insider > a > img
/ImageType-400/6852-1/{B544CDC9-A2D2-4794-BDAE-09BD360051...
cover image of Partypooper ul.org-collections > li.insider > a > img
/ImageType-400/4951-1/{F3D8EEDB-00F5-43D9-B15D-82A44D822E...
cover image of Brimstone ul.org-collections > li.insider > a > img
/ImageType-400/0017-1/{1B335EFF-A3FF-4C63-B385-BC2C686239...
cover image of The Correspondent div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/{9B739A94-5608-4846-AFD9-98F0B60BFF...
cover image of Theo of Golden div.title-result > div.title-result__cover > a > img
/ImageType-400/0439-1/{7A7A296D-89B9-465C-9A6A-39466244CA...
cover image of Dungeon Crawler Carl div.title-result > div.title-result__cover > a > img
/ImageType-400/16996-1/{6E557FF2-B3E5-45E0-9077-EB254B75F...
cover image of Dear Debbie div.title-result > div.title-result__cover > a > img
/ImageType-400/2343-1/{E43E10BB-EA82-4098-9794-EC755F02F8...
cover image of Project Hail Mary div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/{C122A37F-F984-4062-8F35-1072A99305...
cover image of The Night We Met div.title-result > div.title-result__cover > a > img
/ImageType-400/0017-1/{F6A0CCC2-DF05-4F91-B2D8-CFDF85E636...
cover image of Mending Matters div.title-result > div.title-result__cover > a > img
/ImageType-400/2363-1/{93848654-336B-4CE0-89B9-14C60FF780...
cover image of The Home Edit div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/{440511EC-92F3-4ED7-BD07-A4A2C6ED88...
cover image of A Dirty Guide to a Clean Home div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/{AD23518F-C1C8-4415-A593-FBE7E1C920...
cover image of The Backyard Homestead Book of Building Projects div.title-result > div.title-result__cover > a > img
/ImageType-400/0017-1/{520A10ED-4BCF-4045-88A2-FE58FE23E1...
cover image of Good Housekeeping Home Skills div.title-result > div.title-result__cover > a > img
/ImageType-400/0111-1/CC2/88F/42/{CC288F42-A166-45C9-8DCE...
cover image of Safe & Sound div.title-result > div.title-result__cover > a > img
/ImageType-400/1209-1/{B12F2C31-1B17-4F5B-8F6F-497E74FB51...
main.l-container > div.org-header > div.org-findout > img main.l-container > div.org-header > div.org-findout > img
www.overdrive.com/Content/img/org-innovate.png
main.l-container > div.org-header > div.org-findout > img main.l-container > div.org-header > div.org-findout > img
www.overdrive.com/Content/img/org-educate.png
main.l-container > div.org-header > div.org-findout > img main.l-container > div.org-header > div.org-findout > img
www.overdrive.com/Content/img/org-discover.png
Kanopy main.l-container > div.kanopy-banner > h2 > img
www.overdrive.com/Content/img/kanopy/kanopy-wordmark-white.svg
OverDrive home nav.u_masthead > div.mainNav > a.u_masthead__logo > img
www.overdrive.com/Content/img/OverDrive_Logo%202020.svg
Certified B Corporation div.tablet-logo-block > div.site-footer_b-corp > a > img
www.overdrive.com/Content/img/B-Corp.png
OverDrive, Inc. div.site-footer_od-Logo > h2 > a > img
www.overdrive.com/Content/img/OverDrive_Logo_2020_white.svg
TeachingBooks div.app-blocks > div.app-block > h2 > img.app-wordmark
www.overdrive.com/Content/img/apps/tb-wordmark.svg
Kanopy div.app-blocks > div.app-block > h2 > img.app-wordmark
www.overdrive.com/Content/img/apps/kanopy-wordmark.svg
Sora div.app-blocks > div.app-block > h2 > img.app-wordmark
www.overdrive.com/Content/img/apps/sora-wordmark.svg
threads div.site-footer_lower-bar-cs > div.site-footer_social > a > img.site-footer_csIcon
www.overdrive.com/Content/img/social/threads-brands.svg
Bluesky div.site-footer_lower-bar-cs > div.site-footer_social > a > img.site-footer_csIcon
www.overdrive.com/Content/img/social/bluesky-brands.svg
Facebook div.site-footer_lower-bar-cs > div.site-footer_social > a > img.site-footer_csIcon
www.overdrive.com/Content/img/social/Facebook.svg
LinkedIn div.site-footer_lower-bar-cs > div.site-footer_social > a > img.site-footer_csIcon
www.overdrive.com/Content/img/social/LinkedIn.svg
Instagram div.site-footer_lower-bar-cs > div.site-footer_social > a > img.site-footer_csIcon
www.overdrive.com/Content/img/social/Instagram.svg
YouTube div.site-footer_lower-bar-cs > div.site-footer_social > a > img.site-footer_csIcon
www.overdrive.com/Content/img/social/youtube.svg

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

●Max Potential First Input Delay 120 ms
●Layout shift culprits
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●JavaScript execution time 0.2 s
●Minimizes main-thread work 1.2 s
●Avoid long main-thread tasks 4 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 120 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 290 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○User Timing marks and measures
○Avoid non-composited animations
100

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.

○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
●`[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
●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.
●`button`, `link`, and `menuitem` elements have accessible names
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<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
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
○`[accesskey]` values are unique
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○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
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○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
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○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.
○`[lang]` attributes have a valid value
○`<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.
○Identical links have the same purpose.
○Elements with visible text labels have matching accessible names.
○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

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLMap URL
www.overdrive.com/bundles/js?v=2gydoUhtk4txS1onfETaiECQZhP-o5fvkYEoj-ZhDkQ1www.overdrive.com/bundles/underscore-min.map;
www.overdrive.com/Content/js/v2/bundles/MainNavigationV2_bundle.jswww.overdrive.com/Content/js/v2/bundles/MainNavigationV2_bundle.js.map
www.overdrive.com/Content/js/v2/bundles/All_bundle.jswww.overdrive.com/Content/js/v2/bundles/All_bundle.js.map
●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
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
100

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.

○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 have descriptive text
●Links are crawlable
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
○robots.txt is valid
○Document has a valid `rel=canonical`

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