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Lighthouse Desktop

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

Audit breakdown by category with detailed findings.

78

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.

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.

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-VIDEO
nodeLabel: div.field-item > div.paragraphs-item > div.video__wrapper > video
path: 1,HTML,1,BODY,0,DIV,3,DIV,0,MAIN,1,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,VIDEO
selector: div.field-item > div.paragraphs-item > div.video__wrapper > video
snippet: <video playsinline="" muted="" autoplay="">

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

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
/modules/contrib/views_slideshow/contrib/views_slideshow_...5.8 KiB72 ms
/modules/contrib/jquery_update/replace/jquery/1.12/jquery...33.6 KiB232 ms
www.usenix.org/modules/contrib/views_slideshow/js/views_slideshow.js?tdv9813.4 KiB72 ms
www.usenix.org/modules/contrib/beautytips/js/beautytips.js?v=1.x-2.x1.8 KiB72 ms
/modules/contrib/views_slideshow/contrib/views_slideshow_...2.0 KiB72 ms
www.usenix.org/modules/contrib/back_to_top/js/back_to_top.js?tdv9811.5 KiB72 ms
www.usenix.org/modules/contrib/beautytips/js/jquery.bt.min.js?v=0.9.5-rc16.0 KiB72 ms
www.usenix.org/core/modules/system/js/menus.js?v=1.30.21.3 KiB72 ms
www.usenix.org/themes/motherboard/js/homepage.js?tdv9811.3 KiB72 ms
www.usenix.org/modules/contrib/field_group/js/field_groups.js?tdv9812.5 KiB72 ms
www.usenix.org/modules/contrib/field_group/js/field_group.js?tdv981972 B72 ms
www.usenix.org/themes/motherboard/js/scripts.js?tdv9812.3 KiB72 ms
www.usenix.org/modules/contrib/behavior_weights/js/behavior_weights.js?v=1.x-1.01.3 KiB72 ms
www.usenix.org/modules/custom/usenix_extra_field/js/usenix_extra_field.js?tdv981893 B72 ms
www.usenix.org/themes/motherboard/css/style.css?tdv98114.7 KiB112 ms
www.usenix.org/core/misc/backdrop.js?v=1.30.29.5 KiB112 ms
www.usenix.org/core/misc/jquery.once.js?v=1.2.61.8 KiB72 ms
www.usenix.org/themes/motherboard/core-css-overrides/system.theme.css?tdv9813.0 KiB72 ms
/css2?family=Chakra+Petch:ital,wght@0,300;0,400;0,500;0,6...1.7 KiB268 ms
/core/modules/system/css/menu-dropdown.theme.breakpoint-q...1.4 KiB72 ms
www.usenix.org/core/modules/system/css/menu-toggle.theme.breakpoint.css?tdv9811.2 KiB72 ms
www.usenix.org/modules/contrib/jquery_update/js/jquery_browser.js?v=0.0.1842 B72 ms
www.usenix.org/modules/custom/biblio/biblio.css?tdv9811.9 KiB72 ms
www.usenix.org/core/modules/views/css/views.css?tdv9811.2 KiB72 ms
www.usenix.org/core/modules/user/css/user.css?tdv9811.6 KiB72 ms
/core/modules/system/css/menu-toggle.theme.breakpoint-que...777 B72 ms
www.usenix.org/modules/contrib/paragraphs/css/paragraphs.css?tdv9811.5 KiB72 ms
www.usenix.org/core/modules/date/css/date.css?tdv9811.6 KiB152 ms
www.usenix.org/layouts/motherboard/motherboard.css?tdv981752 B72 ms
www.usenix.org/core/modules/system/css/menu-dropdown.theme.breakpoint.css?tdv9811.0 KiB72 ms
www.usenix.org/modules/contrib/geshifilter/geshifilter.css?tdv9811.1 KiB72 ms
/modules/contrib/workflow/workflow_admin_ui/workflow_admi...773 B72 ms
www.usenix.org/modules/contrib/rules/rules.css?tdv981697 B72 ms
www.usenix.org/core/modules/system/css/system.css?tdv9812.9 KiB152 ms
/modules/custom/usenix_logo_preview/css/usenix_logo_previ...1.0 KiB72 ms
www.usenix.org/core/modules/comment/css/comment.css?tdv981736 B152 ms
www.usenix.org/modules/custom/usenix_conference/css/timezone-picker.css?tdv981804 B72 ms
www.usenix.org/core/modules/system/css/messages.theme.css?tdv9811.4 KiB152 ms
www.usenix.org/core/modules/field/css/field.css?tdv981836 B72 ms
www.usenix.org/modules/contrib/back_to_top/css/back_to_top.css?tdv981981 B152 ms
www.usenix.org/modules/contrib/og/css/og.css?tdv981658 B72 ms
www.usenix.org/core/misc/normalize.css?tdv9812.7 KiB72 ms

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.google-analytics.com/analytics.js7200.0 s20.9 KiB
www.usenix.org/themes/motherboard/video/video-end-slate.mp41209600.0 s136.9 KiB
www.usenix.org/sites/default/files/usenix-membership.jpg1209600.0 s114.2 KiB
www.usenix.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?14400.0 s12.1 KiB
/modules/contrib/jquery_update/replace/jquery/1.12/jquery...1209600.0 s33.6 KiB
www.usenix.org/sites/default/files/srecon_emea_wordmark_750.png1209600.0 s26.7 KiB
www.usenix.org/sites/default/files/homepage-banner__usenix-fallback-logo.png1209600.0 s20.0 KiB
www.usenix.org/sites/default/files/sponsor_images/google_600x240_22.png1209600.0 s14.8 KiB
www.usenix.org/themes/motherboard/css/style.css?tdv9811209600.0 s14.7 KiB
www.usenix.org/themes/motherboard/images/usenix-logo-white.png1209600.0 s13.8 KiB
www.usenix.org/sites/default/files/fast27_logo_green_600x240.png1209600.0 s12.9 KiB
www.usenix.org/themes/motherboard/video/homepage-intro.mp41209600.0 s12.6 KiB
www.usenix.org/sites/default/files/sponsor_images/bloomberg_600x240_14.png1209600.0 s11.5 KiB
www.usenix.org/core/misc/backdrop.js?v=1.30.21209600.0 s9.5 KiB
www.usenix.org/sites/default/files/sponsor_images/peerj_600x240.png1209600.0 s6.6 KiB
www.usenix.org/sites/default/files/nsdi27_card_260x100.png1209600.0 s6.3 KiB
www.usenix.org/sites/default/files/vehiclesec26_card_260x100.png1209600.0 s6.2 KiB
www.usenix.org/sites/default/files/nsdi26_card_260x100.png1209600.0 s6.2 KiB
www.usenix.org/modules/contrib/beautytips/js/jquery.bt.min.js?v=0.9.5-rc11209600.0 s6.0 KiB
/modules/contrib/views_slideshow/contrib/views_slideshow_...1209600.0 s5.8 KiB
www.usenix.org/themes/motherboard/logo.png1209600.0 s5.6 KiB
www.usenix.org/sites/default/files/pepr26_card_260x100.png1209600.0 s5.2 KiB
www.usenix.org/modules/contrib/views_slideshow/js/views_slideshow.js?tdv9811209600.0 s3.4 KiB
www.usenix.org/themes/motherboard/core-css-overrides/system.theme.css?tdv9811209600.0 s3.0 KiB
www.usenix.org/core/modules/system/css/system.css?tdv9811209600.0 s2.9 KiB
www.usenix.org/core/misc/normalize.css?tdv9811209600.0 s2.7 KiB
www.usenix.org/modules/contrib/field_group/js/field_groups.js?tdv9811209600.0 s2.5 KiB
www.usenix.org/themes/motherboard/js/scripts.js?tdv9811209600.0 s2.3 KiB
/modules/contrib/views_slideshow/contrib/views_slideshow_...1209600.0 s2.0 KiB
www.usenix.org/modules/custom/biblio/biblio.css?tdv9811209600.0 s1.9 KiB
www.usenix.org/modules/contrib/beautytips/js/beautytips.js?v=1.x-2.x1209600.0 s1.8 KiB
www.usenix.org/core/misc/jquery.once.js?v=1.2.61209600.0 s1.8 KiB
www.usenix.org/core/modules/user/css/user.css?tdv9811209600.0 s1.6 KiB
www.usenix.org/core/modules/date/css/date.css?tdv9811209600.0 s1.6 KiB
www.usenix.org/modules/contrib/paragraphs/css/paragraphs.css?tdv9811209600.0 s1.5 KiB
www.usenix.org/modules/contrib/back_to_top/js/back_to_top.js?tdv9811209600.0 s1.5 KiB
www.usenix.org/core/modules/system/css/messages.theme.css?tdv9811209600.0 s1.4 KiB
/core/modules/system/css/menu-dropdown.theme.breakpoint-q...1209600.0 s1.4 KiB
www.usenix.org/themes/motherboard/js/homepage.js?tdv9811209600.0 s1.3 KiB
www.usenix.org/core/modules/system/js/menus.js?v=1.30.21209600.0 s1.3 KiB
www.usenix.org/modules/contrib/behavior_weights/js/behavior_weights.js?v=1.x-1.01209600.0 s1.3 KiB
www.usenix.org/core/modules/system/css/menu-toggle.theme.breakpoint.css?tdv9811209600.0 s1.2 KiB
www.usenix.org/core/modules/views/css/views.css?tdv9811209600.0 s1.2 KiB
www.usenix.org/modules/contrib/geshifilter/geshifilter.css?tdv9811209600.0 s1.1 KiB
www.usenix.org/themes/motherboard/css/search.597155d2.svg1209600.0 s1.1 KiB
/modules/custom/usenix_logo_preview/css/usenix_logo_previ...1209600.0 s1.0 KiB
www.usenix.org/core/modules/system/css/menu-dropdown.theme.breakpoint.css?tdv9811209600.0 s1.0 KiB
www.usenix.org/modules/contrib/back_to_top/css/back_to_top.css?tdv9811209600.0 s981 B
www.usenix.org/modules/contrib/field_group/js/field_group.js?tdv9811209600.0 s972 B
www.usenix.org/themes/motherboard/css/conf-card-hover.d2786882.svg1209600.0 s933 B
www.usenix.org/modules/custom/usenix_extra_field/js/usenix_extra_field.js?tdv9811209600.0 s893 B
www.usenix.org/sites/default/files/google_tag/google_tag.script.js?tdv9811209600.0 s886 B
www.usenix.org/modules/contrib/jquery_update/js/jquery_browser.js?v=0.0.11209600.0 s842 B
www.usenix.org/core/modules/field/css/field.css?tdv9811209600.0 s836 B
www.usenix.org/modules/custom/usenix_conference/css/timezone-picker.css?tdv9811209600.0 s804 B
www.usenix.org/themes/motherboard/css/button.9b6ef5a6.svg1209600.0 s793 B
/core/modules/system/css/menu-toggle.theme.breakpoint-que...1209600.0 s777 B
/modules/contrib/workflow/workflow_admin_ui/workflow_admi...1209600.0 s773 B
www.usenix.org/layouts/motherboard/motherboard.css?tdv9811209600.0 s752 B
www.usenix.org/core/modules/comment/css/comment.css?tdv9811209600.0 s736 B
www.usenix.org/themes/motherboard/css/close.29eca637.svg1209600.0 s736 B
www.usenix.org/modules/contrib/rules/rules.css?tdv9811209600.0 s697 B
www.usenix.org/modules/contrib/og/css/og.css?tdv9811209600.0 s658 B
www.usenix.org/themes/motherboard/video/homepage-intro.mp41209600.0 s0 B
www.usenix.org/themes/motherboard/video/homepage-intro.mp41209600.0 s0 B

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
Conference attendees discussing a poster board div.field > div.field-items > div.field-item > img
www.usenix.org/sites/default/files/usenix-membership.jpg113.6 KiB85.2 KiB
div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img
www.usenix.org/sites/default/files/srecon_emea_wordmark_750.png26.2 KiB23.1 KiB
USENIX logo div.block > div.block-content > a > img
www.usenix.org/themes/motherboard/images/usenix-logo-white.png13.3 KiB11.9 KiB
div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img
www.usenix.org/sites/default/files/fast27_logo_green_600x240.png12.4 KiB10.1 KiB
div.views-field > div.field-content > a > img div.views-field > div.field-content > a > img
www.usenix.org/sites/default/files/sponsor_images/google_600x240_22.png14.2 KiB9.4 KiB
div.views-field > div.field-content > a > img div.views-field > div.field-content > a > img
www.usenix.org/sites/default/files/sponsor_images/bloomberg_600x240_14.png11.0 KiB7.2 KiB

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

Diagnostics

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: 50 ms 10.5 KiB
URLTransfer SizeEst Savings
www.usenix.org/themes/motherboard/css/style.css?tdv98114.1 KiB10.5 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: 40 ms 130.0 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-LS8V0YFHZP&cx=c&gtm=4e64h1158.0 KiB65.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-WQSPGJT131.4 KiB64.5 KiB

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
The page has an unload handler in the main frame.Actionable

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: 10 ms 8.1 KiB
URLTransfer SizeEst Savings
www.usenix.org/core/misc/backdrop.js?v=1.30.29.0 KiB5.7 KiB
/modules/contrib/views_slideshow/contrib/views_slideshow_...5.2 KiB2.3 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.usenix.org/themes/motherboard/video/homepage-intro.mp41.8 MiB
www.googletagmanager.com/gtag/js?id=G-LS8V0YFHZP&cx=c&gtm=4e64h1158.1 KiB
www.usenix.org/themes/motherboard/video/video-end-slate.mp4136.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-WQSPGJT131.7 KiB
www.usenix.org/sites/default/files/usenix-membership.jpg114.2 KiB
/s/ibmplexsans/v23/zYXzKVElMYYaJe8bpLHnCwDKr932-G7dytD-Dm...39.3 KiB
/modules/contrib/jquery_update/replace/jquery/1.12/jquery...33.6 KiB
www.usenix.org/themes/motherboard/video/homepage-intro.mp427.5 KiB
www.usenix.org/sites/default/files/srecon_emea_wordmark_750.png26.7 KiB
www.google-analytics.com/analytics.js20.9 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
div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img
www.usenix.org/sites/default/files/srecon_emea_wordmark_750.png
USENIX logo div.block > div.block-content > a > img
www.usenix.org/themes/motherboard/images/usenix-logo-white.png
div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img
www.usenix.org/sites/default/files/fast27_logo_green_600x240.png
Home div.block > div.block-content > a.logo > img
www.usenix.org/themes/motherboard/logo.png
div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img
www.usenix.org/sites/default/files/nsdi26_card_260x100.png
div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img
www.usenix.org/sites/default/files/pepr26_card_260x100.png
div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img
www.usenix.org/sites/default/files/vehiclesec26_card_260x100.png
div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link > img
www.usenix.org/sites/default/files/nsdi27_card_260x100.png

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

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: 768 ms
URLTime Spent
usenix.org/768 ms
www.usenix.org/0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 631 ms
URLTime Spent
www.usenix.org/731 ms
●Time to Interactive 2.3 s
●Layout shift culprits
●Optimize DOM size
●Font display
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Max Potential First Input Delay 40 ms
●Minify CSS
●User Timing marks and measures 5 user timings
●JavaScript execution time 0.2 s
●Minimizes main-thread work 0.4 s
●Network Requests
●Network Round Trip Times 20 ms
●Server Backend Latencies 500 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid large layout shifts 2 layout shifts found
○INP breakdown
○Avoid long main-thread tasks
○Avoid non-composited animations
96

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.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
article#node-298325 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link article#node-298325 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link
article#node-309375 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link article#node-309375 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link
article#node-304484 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link article#node-304484 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link
article#node-295899 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link article#node-295899 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link
article#node-309294 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link article#node-309294 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link
article#node-315299 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link article#node-315299 > div.content > div.pseudo-motherboard-conf-card > a.motherboard-conf-card-link
li.views-row > div.views-field > div.field-content > a li.views-row > div.views-field > div.field-content > a
li.views-row > div.views-field > div.field-content > a li.views-row > div.views-field > div.field-content > a
li.views-row > div.views-field > div.field-content > a li.views-row > div.views-field > div.field-content > a
li.views-row > div.views-field > div.field-content > a li.views-row > div.views-field > div.field-content > a

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

○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
●Image elements have `[alt]` attributes
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●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
●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.
●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
●Document has a main landmark.
●Deprecated ARIA roles were not used
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○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
○Buttons have an accessible name
○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
○Form elements have associated labels
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○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.
○`[lang]` attributes have a valid value
○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.
81

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
Unload event listeners are deprecated and will be removed.
/modules/contrib/jquery_update/replace/jquery/1.12/jquery... line 2, col 9646
SharedStorage
www.usenix.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.
www.usenix.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
Fledge
www.usenix.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
●Uses HTTPS
●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 DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○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
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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