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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.

66

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
/maps/api/js?key=AIzaSyC0BuJ43Ncbmuro17vVxWJWrOzzAPZ0rQE&...1800.0 s178.6 KiB
cdn.dfsdk.com/js/v6/agent.umd.js14400.0 s195.8 KiB
app.posthog.com/static/array.js300.0 s67.1 KiB
us-assets.i.posthog.com/static/surveys.js?v=1.369.5300.0 s32.1 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
/array/phc_kqzJJG8aN5nevL0k1oW4Z8iAGswsxBnsWqIBcOuxjah/co...300.0 s1.1 KiB
www.google-analytics.com/plugins/ua/linkid.js3600.0 s995 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.

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:151.361 source:map[type:text value:[unattributed]]]]

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.

URLTransfer SizeDuration
cdn.dfsdk.com/js/v6/agent.umd.js195.8 KiB641 ms
/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,200..9...798 B63 ms
/css2?family=DM+Sans:ital,opsz,wght@0,9..40,100..1000;1,9...904 B
bookface-static.ycombinator.com/vite/assets/editor-DGH5PXuQ.css2.8 KiB
bookface-static.ycombinator.com/vite/assets/components-CG_FStur.css1.4 KiB
bookface-static.ycombinator.com/vite/assets/YouTube-pzuUIErF.css1.5 KiB
bookface-static.ycombinator.com/vite/assets/LaunchesShowPage-DoYn1TVx.css926 B
bookface-static.ycombinator.com/vite/assets/LaunchesIndexPage-BaiEH-wM.css1.6 KiB
bookface-static.ycombinator.com/vite/assets/LaunchesFormPage-BgKTj1iv.css1.8 KiB
bookface-static.ycombinator.com/vite/assets/Launches-FP6lVcd-.css2.6 KiB
bookface-static.ycombinator.com/vite/assets/dist-DZ0w4YR5.css1.5 KiB
bookface-static.ycombinator.com/vite/assets/react-datepicker-BWcuNA17.css3.5 KiB
bookface-static.ycombinator.com/vite/assets/LaunchesPage-on-pn-qp.css673 B
bookface-static.ycombinator.com/vite/assets/ApplyToYCPage-y3ZQ-TZC.css1.0 KiB
bookface-static.ycombinator.com/vite/assets/PartnersPage-ChhbFxOI.css783 B
bookface-static.ycombinator.com/vite/assets/Breadcrumb-MStH19Bt.css984 B
bookface-static.ycombinator.com/vite/assets/Dropdown-Bj_lTKYz.css942 B
bookface-static.ycombinator.com/vite/assets/styles-CgzI4m3t.css4.9 KiB
bookface-static.ycombinator.com/vite/assets/WhyPage-DFDzpL99.css675 B
bookface-static.ycombinator.com/vite/assets/NewPage-7v7qrga6.css1.1 KiB
bookface-static.ycombinator.com/vite/assets/NewNavbarItem-Jh9CXKjI.css1.4 KiB
bookface-static.ycombinator.com/vite/assets/YCAlerts-CP8TjBWF.css1.3 KiB
bookface-static.ycombinator.com/vite/assets/nouislider-v_DV34yi.css576 B
bookface-static.ycombinator.com/vite/assets/SharedDirectory-BCp7r9c8.css1.6 KiB
bookface-static.ycombinator.com/vite/assets/ApplyBanner-CRsOsJga.css1.2 KiB
/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRA...479 B270 ms
fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap572 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
Replit now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/replit-now-3-03e7f981faef0a67ca9...1.3 MiB1.2 MiB
Scale AI during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/scale-ai-batch3-cac949deabf5b818...871.5 KiB840.6 KiB
Airbnb now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/airbnb-now-1-26d764d24e2486fd91a...751.6 KiB719.9 KiB
GitLab now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/gitlab-now-2-1c6a0934f16b0f8d84d...685.9 KiB655.5 KiB
Airbnb during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/airbnb-batch-2-a1df9c49bacc25254...686.3 KiB649.6 KiB
Replit during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/replit-batch-1-1fa8581e2ab474b54...680.1 KiB645.8 KiB
Instacart during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/instacart-batch-2-c4d5c8eea73e1c...636.0 KiB601.1 KiB
DoorDash now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/doordash-now-331fd1df377dabb4026...581.3 KiB535.7 KiB
Coinbase during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/coinbase-batch-1-d0d5c84104f9f95...562.2 KiB531.8 KiB
GitLab during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/gitlab-batch-1-858c18e16366d3344...546.9 KiB516.5 KiB
DoorDash during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/doordash-batch-2-dd602f0734e6093...521.7 KiB491.4 KiB
Reddit now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/reddit-now-f6838bd6494ed8a21e646...526.6 KiB481.0 KiB
Instacart now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/instacart-now-2-296ed5ff821bb577...509.2 KiB470.3 KiB
Kalshi during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/kalshi-batch-1-12c1828169bef411e...474.5 KiB444.2 KiB
Scale AI now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/scaleai-now-1-225d65a5b18021eeaa...467.3 KiB432.9 KiB
Stripe now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/stripe-now-1-4fc6337a8f67eadec8f...401.6 KiB371.2 KiB
OpenAI now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/openai-now-1-14b338a4c66a1ad05c3...382.2 KiB346.6 KiB
OpenAI during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/openai-batch-2-bd451c2a6d1966e17...368.7 KiB337.0 KiB
Stripe during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/stripe-batch-2-60e80fb0b35bee455...365.8 KiB335.4 KiB
Kalshi now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/kalshi-now-1-3affaf3dd1e1259afd5...345.9 KiB315.5 KiB
Twitch now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/twitch-now-2-9f9f4f8fa6f4e70b792...331.2 KiB300.8 KiB
Twitch during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/twitch-batch-3714c0d71b6d4d29c57...316.1 KiB289.6 KiB
Dropbox now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/dropbox-now-64142144a6030372b92a...290.9 KiB260.0 KiB
Coinbase now div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/coinbase-now-1d5b1a7aa6aaa70d84f...287.4 KiB248.7 KiB
Reddit during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/reddit-batch-a4d08a9bbb466f39806...241.7 KiB222.5 KiB
Dropbox during YC div.pointer-events-none > div.pointer-events-none > div.relative > img.block
/assets/ycdc/beforevsnow/dropbox-batch-7f8ebe6bc34eb91cd5...243.2 KiB222.0 KiB
Substack div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/substack-logo-transparent-b9d1facb0945...57.0 KiB56.8 KiB
Flock Safety div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/flock-safety-logo-transparent-a7e730e8...55.5 KiB55.3 KiB
Front div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/front-logo-transparent-9ba8a5084ef12b3...54.9 KiB54.7 KiB
Deel div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/deel-logo-transparent-016c7a0ae619ae0d...50.9 KiB50.7 KiB
OpenAI div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/openai-logo-transparent-c650fb6bfd7073...48.3 KiB48.1 KiB
Brex div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/brex-logo-transparent-f779de40bd5826f5...43.4 KiB43.3 KiB
Vanta div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/vanta-logo-transparent-5af5e89861aa0cd...38.8 KiB38.6 KiB
Rappi div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/rappi-logo-transparent-e4900ae32175ac3...35.2 KiB35.1 KiB
PagerDuty div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/pagerduty-logo-transparent-8d295666277...30.9 KiB30.7 KiB
Docker div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/docker-logo-transparent-f9e9d5e42c317c...27.7 KiB27.6 KiB
Dropbox div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/dropbox-logo-transparent-d71a0aef6f61b...27.3 KiB27.2 KiB
Benchling div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/benchling-logo-transparent-e466c10b7e0...27.3 KiB27.2 KiB
Airbnb div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/airbnb-logo-transparent-51af28d59ce972...27.2 KiB27.1 KiB
Zepto div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/zepto-logo-transparent-336ddf8fd31feb2...26.7 KiB26.6 KiB
Gusto div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/gusto-logo-transparent-dd645cd073cb1f8...26.0 KiB25.9 KiB
GitLab div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/gitlab-logo-transparent-516e84f6570b67...26.0 KiB25.9 KiB
Scale AI div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/scaleai-logo-transparent-0bfe7bf608b76...25.9 KiB25.8 KiB
Instacart div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/instacart-logo-transparent-bd83ae56390...25.6 KiB25.5 KiB
Kalshi div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/kalshi-logo-transparent-36e6c9f8ee1e94...24.6 KiB24.5 KiB
Zapier div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/zapier-logo-transparent-28db2da0f6c807...23.8 KiB23.7 KiB
Coinbase div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/coinbase-logo-transparent-884b707305fb...23.7 KiB23.6 KiB
Stripe div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/stripe-logo-transparent-85c767ab1ed5ba...23.5 KiB23.4 KiB
PostHog div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/posthog-logo-transparent-b066a8e28cc4b...22.0 KiB22.0 KiB
Reddit div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/reddit-logo-transparent-6500aa21285663...20.9 KiB20.8 KiB
Ironclad div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/ironclad-logo-transparent-0d5f5cdbd3dc...20.8 KiB20.8 KiB
Flexport div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/flexport-logo-transparent-b17c1ec27aec...20.8 KiB20.8 KiB
Rippling div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/rippling-logo-transparent-491cdc4a31bb...20.7 KiB20.6 KiB
DoorDash div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/doordash-logo-transparent-04e06210d255...20.5 KiB20.4 KiB
Stoke Space div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/stoke-logo-transparent-1d2a6fa290452a9...18.9 KiB18.8 KiB
Replit div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/replit-logo-transparent-62c8eebb524c82...17.8 KiB17.8 KiB
Faire div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/faire-logo-transparent-5c0990582c0111c...15.9 KiB15.8 KiB
Twitch div.pointer-events-none > div.mx-auto > div.flex > img.h-[90px]
/assets/ycdc/logos/twitch-logo-transparent-b8560e630f4d25...14.7 KiB14.7 KiB
section#in-the-room-photos > div.group/grid > div.group > video.duration-400 section#in-the-room-photos > div.group/grid > div.group > video.duration-400
/assets/ycdc/intheroomwith/brian-chesky-poster-compressed...80.8 KiB11.3 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: 246 ms
URLTime Spent
ycombinator.com/246 ms
www.ycombinator.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

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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: 400 ms 776.5 KiB
URLTransfer SizeEst Savings
bookface-static.ycombinator.com/vite/assets/dist-CwwFENZK.js124.2 KiB102.6 KiB
/maps/api/js?key=AIzaSyC0BuJ43Ncbmuro17vVxWJWrOzzAPZ0rQE&...178.5 KiB99.5 KiB
cdn.dfsdk.com/js/v6/agent.umd.js195.1 KiB80.2 KiB
bookface-static.ycombinator.com/vite/assets/ssr_pages-D1HBFGp1.js84.8 KiB68.0 KiB
bookface-static.ycombinator.com/vite/assets/CartesianChart-DcVO0jqS.js78.1 KiB64.3 KiB
www.googletagmanager.com/gtag/js?id=G-CHJJ1RJL5K&cx=c&_slc=1150.8 KiB62.0 KiB
bookface-static.ycombinator.com/vite/assets/renderMarkdown-iDBsrX0B.js81.0 KiB48.4 KiB
bookface-static.ycombinator.com/vite/assets/sentry-CD7zRbAa.js65.5 KiB42.7 KiB
maps.googleapis.com/maps-api-v3/api/js/64/9c/util.js100.1 KiB37.8 KiB
bookface-static.ycombinator.com/vite/assets/index.esm-CUIxdTnW.js43.0 KiB35.8 KiB
app.posthog.com/static/array.js66.8 KiB34.3 KiB
maps.googleapis.com/maps-api-v3/api/js/64/9c/common.js41.0 KiB30.1 KiB
us-assets.i.posthog.com/static/surveys.js?v=1.369.531.9 KiB25.4 KiB
bookface-static.ycombinator.com/vite/assets/react-datepicker-D1bZtvxf.js24.5 KiB23.1 KiB
bookface-static.ycombinator.com/vite/assets/client-BKT2-yPG.js55.2 KiB22.5 KiB

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Other1.7 s
Script Evaluation668 ms
Style & Layout256 ms
Script Parsing & Compilation69 ms
Rendering68 ms
Garbage Collection58 ms
Parse HTML & CSS54 ms

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
/assets/ycdc/partners/harshita-arora-now-compressed-9c9b8...1.8 MiB
/assets/ycdc/beforevsnow/replit-now-3-03e7f981faef0a67ca9...1.3 MiB
/assets/ycdc/partners/diana-hu-now-1-compressed-55e1804ed...925.1 KiB
/assets/ycdc/beforevsnow/scale-ai-batch3-cac949deabf5b818...872.9 KiB
/assets/ycdc/partners/harshita-arora-batch-compressed-7fd...809.2 KiB
/assets/ycdc/beforevsnow/airbnb-now-1-26d764d24e2486fd91a...752.9 KiB
/assets/ycdc/beforevsnow/airbnb-batch-2-a1df9c49bacc25254...687.5 KiB
/assets/ycdc/beforevsnow/gitlab-now-2-1c6a0934f16b0f8d84d...687.2 KiB
/assets/ycdc/partners/gustaf-alstromer-batch-11-1f6e28f6d...682.2 KiB
/assets/ycdc/beforevsnow/replit-batch-1-1fa8581e2ab474b54...681.3 KiB

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

●Layout shift culprits
●Optimize DOM size
●Font display
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●Reduce unused CSS
●User Timing marks and measures 6 user timings
●JavaScript execution time 0.6 s
●Avoid long main-thread tasks 6 long tasks found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 220 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 280 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○LCP request discovery
○Avoid non-composited animations
97

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.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Startup News div.mx-auto > aside.flex > div > h4.mb-4

These are opportunities to improve keyboard navigation in your application.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

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
●`[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
●`[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
●`[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 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.
●Deprecated ARIA roles were not used
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
●Image elements do not have `[alt]` attributes that are redundant text.
○`[accesskey]` values are unique
○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
○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
○Links are distinguishable without relying on color.
○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
○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

●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
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Ensure proper origin isolation with COOP
○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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