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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.

57

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.

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:0.3650840000000001] map[node:map[boundingRect:map[bottom:7946 height:7309 left:0 right:1350 top:637 width:1350] lhId:page-10-DIV nodeLabel:Khan Academy boosts scores! Learn with millions of people worldwide by explorin… path:1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,1,DIV,2,MAIN,0,DIV selector:div#app-shell-root > div._keh75d > main#main-content > div._vtegui snippet:<div class="_vtegui"> type:node] score:0.176112 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:615 height:284 left:161 right:560 top:332 width:399] lhId:page-17-IMG nodeLabel:Donate today! path:1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,1,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,2,IMG selector:div._xfcx8w > div._1fwzriw > div > img._5s95i9 snippet:<img alt="Donate today!" class="_5s95i9" src="https://cdn.kastatic.org/ka-mpp/61287d65-adce-475f-a3ab-9a384bc863f8.png"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:7946 height:7309 left:0 right:1350 top:637 width:1350] lhId:page-10-DIV nodeLabel:Khan Academy boosts scores! Learn with millions of people worldwide by explorin… path:1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,1,DIV,2,MAIN,0,DIV selector:div#app-shell-root > div._keh75d > main#main-content > div._vtegui snippet:<div class="_vtegui"> type:node] score:0.130139 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1254 height:357 left:176 right:695 top:897 width:519] lhId:page-0-IMG nodeLabel:div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51 path:1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,1,DIV,2,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,IMG selector:div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51 snippet:<img src="https://cdn.kastatic.org/images/lohp/boost-scores.png" alt="" class="_82vv51"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:7946 height:7309 left:0 right:1350 top:637 width:1350] lhId:page-10-DIV nodeLabel:Khan Academy boosts scores! Learn with millions of people worldwide by explorin… path:1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,1,DIV,2,MAIN,0,DIV selector:div#app-shell-root > div._keh75d > main#main-content > div._vtegui snippet:<div class="_vtegui"> type:node] score:0.037405 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:615 height:284 left:161 right:560 top:332 width:399] lhId:page-17-IMG nodeLabel:Donate today! path:1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,1,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,2,IMG selector:div._xfcx8w > div._1fwzriw > div > img._5s95i9 snippet:<img alt="Donate today!" class="_5s95i9" src="https://cdn.kastatic.org/ka-mpp/61287d65-adce-475f-a3ab-9a384bc863f8.png"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1254 height:357 left:176 right:695 top:897 width:519] lhId:page-0-IMG nodeLabel:div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51 path:1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,1,DIV,2,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,IMG selector:div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51 snippet:<img src="https://cdn.kastatic.org/images/lohp/boost-scores.png" alt="" class="_82vv51"> type:node] score:0.005303 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1254 height:357 left:176 right:695 top:897 width:519] lhId:page-0-IMG nodeLabel:div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51 path:1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,1,DIV,2,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,IMG selector:div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51 snippet:<img src="https://cdn.kastatic.org/images/lohp/boost-scores.png" alt="" class="_82vv51"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:930 height:409 left:16 right:391 top:521 width:375] lhId:page-14-DIV nodeLabel:Use of cookies Cookies are small files placed on your device that collect infor… path:1,HTML,1,BODY,4,DIV,1,DIV selector:body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk snippet:<div id="onetrust-banner-sdk" class="otFloatingRoundedCorner ot-bottom-left vertical-align-content ot-buttons-fw" tabindex="0" role="region" aria-label="Cookie banner" style="bottom: 1rem;"> type:node] score:0.00055]]

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:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:31.449 source:map[column:482660 line:21 type:source-location url:https://cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.js urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:8.526 source:map[column:650516 line:20 type:source-location url:https://cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.js urlProvider:network]] map[reflowTime:22.923 source:map[column:650634 line:20 type:source-location url:https://cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.js urlProvider:network]]]

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._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51
path: 1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,1,DIV,2,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,IMG
selector: div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51
snippet: <img src="https://cdn.kastatic.org/images/lohp/boost-scores.png" alt="" class="_82vv51">

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
cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.js771.2 KiB640 ms
cdn.kastatic.org/khanacademy/khanacademy.753cf3d0cb0bd8f2.css10.3 KiB202 ms
cdn.kastatic.org/khanacademy/runtime.d2da0f18e591e2c0.js13.6 KiB

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
cdn.cookielaw.org/scripttemplates/202310.2.0/otBannerSdk.js86400.0 s102.8 KiB
cdn.cookielaw.org/logos/static/ot_company_logo.png86400.0 s19.1 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js86400.0 s9.1 KiB
/api/badges/download-on-the-app-store/black/en-us?release...604800.0 s11.3 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg86400.0 s2.7 KiB

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
cdn.kastatic.org/khanacademy/fonts/1cf13853095a62e2-LatoLatin-Bold.woff210 ms
/khanacademy/fonts/b430c69579ae2887-SourceSerifPro-Semibo...5.0 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.

URLResource SizeEst Savings
Donate today! div._xfcx8w > div._1fwzriw > div > img._5s95i9
cdn.kastatic.org/ka-mpp/61287d65-adce-475f-a3ab-9a384bc863f8.png782.0 KiB763.6 KiB
div._e296pg > div._1b4n03jl > div._hoh1o6o > img._1k6dqj1 div._e296pg > div._1b4n03jl > div._hoh1o6o > img._1k6dqj1
cdn.kastatic.org/images/lohp/faces_collage_2@2x.png666.4 KiB618.9 KiB
div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51 div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51
cdn.kastatic.org/images/lohp/boost-scores.png210.2 KiB180.0 KiB
div._e296pg > div._mg36wky > div._et3ir1 > img._1k6dqj1 div._e296pg > div._mg36wky > div._et3ir1 > img._1k6dqj1
cdn.kastatic.org/images/lohp/laptop_collage@2x.png181.6 KiB134.5 KiB
div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._zdxht7 div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._zdxht7
cdn.kastatic.org/images/lohp/empower_teachers_icon.png9.0 KiB7.3 KiB
div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._zdxht7 div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._zdxht7
cdn.kastatic.org/images/lohp/personalized_learning_icon.png8.8 KiB7.0 KiB
div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._14srqcp div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._14srqcp
cdn.kastatic.org/images/lohp/trusted_content_icon.png9.1 KiB7.0 KiB
Get it on Google Play ul > li._ouyp5ih > a._wilhdph > img._1iym5ly
cdn.kastatic.org/images/store-badges/google-play/en.png5.9 KiB5.7 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: 243 ms
URLTime Spent
khanacademy.org/243 ms
www.khanacademy.org/0.0 ms

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.

ElementLayout shift score
Khan Academy boosts scores! Learn with millions of people worldwide by explorin… div#app-shell-root > div._keh75d > main#main-content > div._vtegui
0.176
Khan Academy boosts scores! Learn with millions of people worldwide by explorin… div#app-shell-root > div._keh75d > main#main-content > div._vtegui
0.130
Khan Academy boosts scores! Learn with millions of people worldwide by explorin… div#app-shell-root > div._keh75d > main#main-content > div._vtegui
0.037
div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51 div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51
0.005
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.001
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000
Use of cookies Cookies are small files placed on your device that collect infor… body.lang-en > div#onetrust-consent-sdk > div#onetrust-banner-sdk
0.000

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: 440 ms 577.1 KiB
URLTransfer SizeEst Savings
cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.js764.7 KiB437.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-WSX5PBP152.2 KiB86.5 KiB
cdn.cookielaw.org/scripttemplates/202310.2.0/otBannerSdk.js102.7 KiB53.6 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
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.Not actionable

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: 0.0 ms 17.0 KiB
URLTransfer SizeEst Savings
#onetrust-banner-sdk{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} …19.6 KiB17.0 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
cdn.kastatic.org/ka-mpp/61287d65-adce-475f-a3ab-9a384bc863f8.png782.8 KiB
cdn.kastatic.org/khanacademy/khanacademy.47960f894ea35774.js771.2 KiB
cdn.kastatic.org/images/lohp/faces_collage_2@2x.png667.2 KiB
cdn.kastatic.org/images/lohp/last_chance_collage@2x.png373.9 KiB
cdn.kastatic.org/images/lohp/boost-scores.png210.6 KiB
cdn.kastatic.org/images/lohp/laptop_collage@2x.png182.0 KiB
cdn.kastatic.org/images/lohp/math-unicorn-donate-collage.png158.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-WSX5PBP152.6 KiB
cdn.cookielaw.org/scripttemplates/202310.2.0/otBannerSdk.js102.8 KiB
cdn.kastatic.org/images/lohp/anjali-3.png76.0 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._e296pg > div._1b4n03jl > div._hoh1o6o > img._1k6dqj1 div._e296pg > div._1b4n03jl > div._hoh1o6o > img._1k6dqj1
cdn.kastatic.org/images/lohp/faces_collage_2@2x.png
Donate today! div._xfcx8w > div._1fwzriw > div > img._5s95i9
cdn.kastatic.org/ka-mpp/61287d65-adce-475f-a3ab-9a384bc863f8.png
div._e296pg > div._mg36wky > div._et3ir1 > img._1k6dqj1 div._e296pg > div._mg36wky > div._et3ir1 > img._1k6dqj1
cdn.kastatic.org/images/lohp/laptop_collage@2x.png
div._e296pg > div._1b4n03jl > div._hoh1o6o > img._1k6dqj1 div._e296pg > div._1b4n03jl > div._hoh1o6o > img._1k6dqj1
cdn.kastatic.org/images/lohp/math-unicorn-donate-collage.png
div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51 div._1s6u9f56 > div._8plbkmf > div._1lnhlk8u > img._82vv51
cdn.kastatic.org/images/lohp/boost-scores.png
Get it on Google Play ul > li._ouyp5ih > a._wilhdph > img._1iym5ly
cdn.kastatic.org/images/store-badges/google-play/en.png
div._8iuiziq > div._1wqqgcad > div._46s8e9s > img._1k6dqj1 div._8iuiziq > div._1wqqgcad > div._46s8e9s > img._1k6dqj1
cdn.kastatic.org/images/lohp/anjali-3.png
div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._14srqcp div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._14srqcp
cdn.kastatic.org/images/lohp/trusted_content_icon.png
div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._zdxht7 div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._zdxht7
cdn.kastatic.org/images/lohp/personalized_learning_icon.png
div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._zdxht7 div._3vgeo5o > div._5hffmqw > div._xnpl0ze > img._zdxht7
cdn.kastatic.org/images/lohp/empower_teachers_icon.png
Download on the App Store ul > li._ouyp5ih > a._wilhdph > img._1iym5ly
/api/badges/download-on-the-app-store/black/en-us?release...

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

●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 2 user timings
●JavaScript execution time 0.6 s
●Minimizes main-thread work 1.2 s
●Avoid long main-thread tasks 2 long tasks found
●Avoid non-composited animations 4 animated elements found
●Network Requests
●Network Round Trip Times 190 ms
●Server Backend Latencies 240 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 230 ms
○INP breakdown
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.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
English div._s6za34 > div._1bvnlzk > div._6kyiev1 > button#:r6:
cookie policy div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text > a
○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.
●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
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements 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
○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
○`<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
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
○Detected JavaScript libraries
85

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 destinationLink Text
cookiepedia.co.uk/giving-consent-to-cookiesMore information

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

Crawling and Indexing

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Line #ContentError
1<!DOCTYPE html>Syntax not understood
2<html lang="en">Syntax not understood
3 <head>Syntax not understood
4 <metaSyntax not understood
5 http-equiv="Content-Security-Policy"Syntax not understood
6 content="default-src 'self'; img-src 'self' data:; media-src 'self' data:; object-src 'none'; style-src 'self' 'sha256-o4vzfmmUENEg4chMjjRP9EuW9ucGnGIGVdbl8d0SHQQ='; script-src 'self' 'sha256-a9bHdQGvRzDwDVzx8m+Rzw+0FHZad8L0zjtBwkxOIz4=';"Unknown directive
7 />Syntax not understood
8 <linkSyntax not understood
9 href="/_fs-ch-1T1wmsGaOgGaSxcX/assets/inter-var.woff2"Syntax not understood
10 rel="preload"Syntax not understood
11 as="font"Syntax not understood
12 type="font/woff2"Syntax not understood
13 crossoriginSyntax not understood
14 />Syntax not understood
15 <link href="/_fs-ch-1T1wmsGaOgGaSxcX/assets/styles.css" rel="stylesheet" />Syntax not understood
16 <meta name="viewport" content="width=device-width, initial-scale=1" />Syntax not understood
17 <title>Client Challenge</title>Syntax not understood
18 <style>Syntax not understood
20 font-size: 16px;Unknown directive
21 font-family: 'Inter', sans-serif;Unknown directive
22 margin-top: 10px;Unknown directive
23 margin-left: 10px;Unknown directive
24 display: none;Unknown directive
25 }Syntax not understood
26 </style>Syntax not understood
27 </head>Syntax not understood
28 <body>Syntax not understood
29 <noscript>Syntax not understood
30 <div class="noscript-container">Syntax not understood
31 <div class="noscript-content">Syntax not understood
32 <imgSyntax not understood
33 src="/_fs-ch-1T1wmsGaOgGaSxcX/assets/errorIcon.svg"Syntax not understood
34 alt=""Syntax not understood
35 role="presentation"Syntax not understood
36 class="error-icon"Syntax not understood
37 />Syntax not understood
38 <span class="noscript-span"Syntax not understood
39 >JavaScript is disabled in your browser.</spanSyntax not understood
40 >Syntax not understood
41 <p>Please enable JavaScript to proceed.</p>Syntax not understood
42 </div>Syntax not understood
43 </div>Syntax not understood
44 </noscript>Syntax not understood
45 <div id="loading-error" role="alert" aria-live="polite">Syntax not understood
46 A required part of this site couldn’t load. This may be due to a browserSyntax not understood
47 extension, network issues, or browser settings. Please check yourSyntax not understood
48 connection, disable any ad blockers, or try using a different browser.Syntax not understood
49 </div>Syntax not understood
50 <script>Syntax not understood
51 function loadScript(src) {Syntax not understood
52 return new Promise((resolve, reject) => {Syntax not understood
53 const script = document.createElement('script');Syntax not understood
54 script.onload = resolve;Syntax not understood
55 script.onerror = (event) => {Syntax not understood
56 console.error('Script load error event:', event);Unknown directive
57 document.getElementById('loading-error').style.display = 'block';Syntax not understood
58 reject(Syntax not understood
59 new Error(Syntax not understood
60 `Failed to load script: ${src}, Please contact the service administrator.`Unknown directive
61 )Syntax not understood
62 );Syntax not understood
63 };Syntax not understood
64 script.src = src;Syntax not understood
65 document.body.appendChild(script);Syntax not understood
66 });Syntax not understood
67 }Syntax not understood
69 loadScript('/_fs-ch-1T1wmsGaOgGaSxcX/errors.js')Syntax not understood
70 .then(() => {Syntax not understood
71 const script = document.createElement('script');Syntax not understood
72 script.src = '/_fs-ch-1T1wmsGaOgGaSxcX/script.js?reload=true';Syntax not understood
73 script.onerror = (event) => {Syntax not understood
74 console.error('Script load error event:', event);Unknown directive
75 const errorMsg = new Error(Syntax not understood
76 `Failed to load script: ${script.src}. Please contact the service administrator.`Unknown directive
77 );Syntax not understood
78 console.error(errorMsg);Syntax not understood
79 handleScriptError();Syntax not understood
80 };Syntax not understood
81 document.body.appendChild(script);Syntax not understood
82 })Syntax not understood
83 .catch((error) => {Syntax not understood
84 console.error(error);Syntax not understood
85 });Syntax not understood
86 </script>Syntax not understood
87 </body>Syntax not understood
88</html>Syntax not understood

To appear in search results, crawlers need access to your app.

○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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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