Lighthouse Mobile
· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.Detailed Report
Audit breakdown by category with detailed findings.
Performance
Insights
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
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
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.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| caniuse.com/css/theme-light.css?1776478325 | 704 B | |
| caniuse.com/css/home.css?1776478324 | 1.5 KiB | 304 ms |
| caniuse.com/css/main.css?1776478324 | 7.8 KiB | |
| fonts.googleapis.com/css?family=Inconsolata&display=swap | 988 B | 819 ms |
A long cache lifetime can speed up repeat visits to your page. Learn more about caching.
Performance issues directly impact user engagement and conversion rates.
| Request | Cache TTL | Transfer Size |
|---|---|---|
| /pagead/managed/js/adsense/m202604160101/show_ads_impl_fy... | 1209600.0 s | 177.5 KiB |
| caniuse.com/fonts/open-sans-300.woff2 | 0.0 ms | 14.8 KiB |
| caniuse.com/fonts/open-sans-regular.woff2 | 0.0 ms | 14.2 KiB |
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
Diagnostics
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| caniuse.com/css/main.css?1776478324 | 7.8 KiB | 2.2 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /pagead/managed/js/adsense/m202604160101/show_ads_impl_fy... | 177.5 KiB | 126.3 KiB |
| www.googletagmanager.com/gtag/js?id=G-8SCDSGDGKM | 151.0 KiB | 62.1 KiB |
| caniuse.com/js/bundle.js?1776478326 | 90.7 KiB | 49.4 KiB |
| pagead2.googlesyndication.com/pagead/js/adsbygoogle.js | 54.2 KiB | 24.4 KiB |
More information about the performance of your application. These numbers don't directly affect the Performance score.
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.
Best Practices
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.
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.
Performance issues directly impact user engagement and conversion rates.
| Line # | Content | Error |
|---|---|---|
| 1 | <!doctype html> | Syntax not understood |
| 2 | <html dir="ltr" lang="en-US" class="no-js"> | Syntax not understood |
| 3 | <head> | Syntax not understood |
| 4 | <meta charset="utf-8" /> | Syntax not understood |
| 5 | <title>"robots.txt" | Can I use... Support tables for HTML5, CSS3, etc</title> | Syntax not understood |
| 7 | <meta name="viewport" content="width=device-width"> | Syntax not understood |
| 9 | <link rel="alternate" type="application/atom+xml" title="Can I Use updates" href="/feed"> | Syntax not understood |
| 10 | <link href="//fonts.googleapis.com/css?family=Inconsolata&display=swap" rel="stylesheet"> | Syntax not understood |
| 11 | <link rel="icon" href="/img/favicon-128.png" sizes="16x16 32x32 64x64 128x128" type="image/png"/> | Syntax not understood |
| 12 | <link rel="apple-touch-icon" href="/img/favicon-128.png"> | Syntax not understood |
| 14 | <link rel="stylesheet" href="/css/main.css?1776478324" media="all"> | Syntax not understood |
| 15 | <link rel="stylesheet" data-theme="light" href="/css/theme-light.css?1776478325" media="all"> | Syntax not understood |
| 16 | <link rel="stylesheet" data-theme="dark" href="/css/theme-dark.css?1776478325" media="(prefers-color-scheme: dark)"> | Unknown directive |
| 17 | <meta name="Description" content=""Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers."> | Syntax not understood |
| 18 | <meta name="keywords" content="web browser compatibility support html css svg html5 css3 opera chrome firefox safari internet explorer"> | Syntax not understood |
| 19 | <link rel="search" href="/opensearch.xml" type="application/opensearchdescription+xml" title="Can I use"/> | Syntax not understood |
| 20 | <link rel="preconnect" href="https://ipinfo.io"> | Unknown directive |
| 21 | <link rel="preconnect" href="https://www.google-analytics.com"> | Unknown directive |
| 22 | <base href="/" /> | Syntax not understood |
| 23 | <script> | Syntax not understood |
| 24 | document.write('<style>.static-only {display:none}</style>'); | Unknown directive |
| 25 | </script> | Syntax not understood |
| 27 | <script async src="https://www.googletagmanager.com/gtag/js?id=G-8SCDSGDGKM"></script> | Unknown directive |
| 28 | <script> | Syntax not understood |
| 29 | window.dataLayer = window.dataLayer || []; | Syntax not understood |
| 30 | function gtag(){dataLayer.push(arguments);} | Syntax not understood |
| 31 | gtag('js', new Date()); | Syntax not understood |
| 33 | gtag('config', 'G-8SCDSGDGKM'); | Syntax not understood |
| 34 | </script> | Syntax not understood |
| 36 | <script> | Syntax not understood |
| 37 | (function() { | Syntax not understood |
| 38 | if (!window.customElements) { | Syntax not understood |
| 39 | var s = document.createElement('script'); | Syntax not understood |
| 40 | s.src = '/legacy-handler.js'; | Syntax not understood |
| 41 | document.getElementsByTagName('head')[0].appendChild(s); | Syntax not understood |
| 42 | } | Syntax not understood |
| 43 | }()); | Syntax not understood |
| 44 | </script> | Syntax not understood |
| 45 | <!--[if IE]><script src="/legacy-handler.js"></script><![endif]--><script defer src="js-data/data.js?1776729872"></script><script defer src="js/bundle.js?1776478326"></script></head> | Syntax not understood |
| 46 | <body class="is-home"> | Syntax not understood |
| 47 | <div id="main" class="ciu-main-wrap"> | Syntax not understood |
| 49 | <header class="ciu-page-header"> | Syntax not understood |
| 50 | <nav role="navigation" id="tab-container"> | Syntax not understood |
| 51 | <ul class="ciu-page-header__primary-nav"> | Syntax not understood |
| 52 | <li class="site-nav-item js-site-nav"><a href="/" data-route="home">Home</a></li> | Syntax not understood |
| 53 | <li class="site-nav-item js-site-nav site-nav-item--news"><a href="/ciu/news" data-route="news">News</a></li> | Syntax not understood |
| 54 | </ul> | Syntax not understood |
| 56 | <ul class="ciu-page-header__secondary-nav"> | Syntax not understood |
| 57 | <li class="site-nav-item js-site-nav site-nav-item--comparison"><a href="/ciu/comparison" data-route="comparison">Compare<span class="site-nav__extra-text"> browsers</span></a></li> | Syntax not understood |
| 58 | <li class="site-nav-item js-site-nav site-nav-item--last "><a href="/ciu/about" data-route="about">About</a></li> | Syntax not understood |
| 59 | </ul> | Syntax not understood |
| 61 | <a class="news js-news" data-newstime="1772668800" href="https://caniuse.com/loading-lazy-media"><span class="date">March 5, 2026 -</span> New feature: Lazy loading via attribute for video & audio</a> </nav> | Unknown directive |
| 64 | <section class="ciu-search"> | Syntax not understood |
| 65 | <div class="ciu-search__inner js-search"> | Syntax not understood |
| 66 | <a href="/" class="ciu-search__label">Can I use</a> | Syntax not understood |
| 67 | <form action="/" class="ciu-search__form"> | Syntax not understood |
| 68 | <label class="ciu-search__a11y-label" for="feat_search">Search</label> | Syntax not understood |
| 69 | <input type="text" class="ciu-search__input" id="feat_search" name="search" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" autofocus value="robots.txt"> | Syntax not understood |
| 70 | <input type="hidden" name="static" value="1"> | Syntax not understood |
| 71 | </form> | Syntax not understood |
| 72 | ? | Syntax not understood |
| 73 | <button class="options-toggle js-options-toggle"> | Syntax not understood |
| 74 | <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16" class="icon"> | Unknown directive |
| 75 | <path d="M16,8.87V7L15.74,7l-1.95-.64-.52-1.25,1-2.12L13,1.67l-.25.12-1.82.93L9.66,2.2,8.87,0H7.05L7,.26,6.33,2.21l-1.25.52L3,1.73,1.67,3l.12.25.93,1.82L2.2,6.34,0,7.13V8.95L.26,9l2,.64.52,1.25L1.73,13,3,14.33l.25-.12,1.82-.93,1.26.52L7.13,16H8.95L9,15.74l.64-2,1.26-.52,2.11,1L14.33,13l-.12-.25-.93-1.82.52-1.26ZM8,10.55A2.55,2.55,0,1,1,10.55,8,2.55,2.55,0,0,1,8,10.55Z"/> | Syntax not understood |
| 76 | </svg> | Syntax not understood |
| 77 | <span> | Syntax not understood |
| 78 | Settings | Syntax not understood |
| 79 | </span> | Syntax not understood |
| 80 | </button> | Syntax not understood |
| 81 | </div> | Syntax not understood |
| 83 | <div class="search-result-info js-search-result-info">0 results found. <p>Why not <a href="https://github.com/Fyrd/caniuse/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+thnthnth">suggest this feature be added?</a></p></div> | Unknown directive |
| 84 | </section> | Syntax not understood |
| 86 | </header> | Syntax not understood |
| 88 | <main class="ciu-page-content js-content" data-static-id="search"> | Syntax not understood |
| 89 | </main> | Syntax not understood |
| 91 | <aside class="bottom-ad"> | Syntax not understood |
| 92 | <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> | Syntax not understood |
| 93 | <!-- Bottom leaderboard --> | Syntax not understood |
| 94 | <ins class="adsbygoogle" | Syntax not understood |
| 95 | style="display:inline-block;width:728px;height:90px" | Unknown directive |
| 96 | data-ad-client="ca-pub-3347535679733957" | Syntax not understood |
| 97 | data-ad-slot="1205929339"></ins> | Syntax not understood |
| 98 | <script> | Syntax not understood |
| 99 | (adsbygoogle = window.adsbygoogle || []).push({}); | Syntax not understood |
| 100 | </script> | Syntax not understood |
| 101 | </aside> | Syntax not understood |
| 103 | <footer class="ciu-footer"> | Syntax not understood |
| 104 | <div class="footer__section footer__primary"> | Syntax not understood |
| 105 | <h3 class="footer__heading">Can I use...</h3> | Syntax not understood |
| 106 | <p class="site-description">Browser support tables for modern web technologies</p> | Syntax not understood |
| 107 | <p>Created & maintained by <a class="external-link" href="https://front-end.social/@fyrd">@Fyrd</a>, design by <a class="external-link" href="https://mastodon.world/@lensco">@Lensco</a>.</p> | Unknown directive |
| 108 | <p>Support data contributions by the GitHub <a class="external-link" href="https://github.com/Fyrd/caniuse/graphs/contributors">community</a>. | Unknown directive |
| 110 | <p id="usage_note"> | Syntax not understood |
| 111 | Usage share statistics by <a class="external-link" href="http://gs.statcounter.com/">StatCounter GlobalStats</a> for March, 2026 </p> | Unknown directive |
| 113 | <p>Location detection provided by <a class="external-link" href="//ipinfo.io">ipinfo.io</a>. | Syntax not understood |
| 114 | </p> | Syntax not understood |
| 116 | <p> | Syntax not understood |
| 117 | Browser testing done via | Syntax not understood |
| 118 | <a class="external-link" href="https://www.browserstack.com?ref=caniuse-source&caniuse_source=brand-asset&utm_source=caniuse&utm_medium=partnered&utm_campaigncode=701OW000008y9C1YAI" target="_blank"> | Unknown directive |
| 119 | <img src="/img/browserstack.svg" alt="BrowserStack" width="140" height="28" loading="lazy"> | Syntax not understood |
| 120 | </a> | Syntax not understood |
| 121 | </p> | Syntax not understood |
| 123 | </div> | Syntax not understood |
| 125 | <div class="footer__section footer__patreon"> | Syntax not understood |
| 126 | <h3 class="footer__heading">Support via Patreon</h3> | Syntax not understood |
| 128 | <p>Become a caniuse Patron to support the site and disable ads for only $1/month!</p> | Syntax not understood |
| 130 | <div class="patreon-button"> | Syntax not understood |
| 131 | <a href="https://www.patreon.com/join/caniuse"> | Unknown directive |
| 132 | <img src="/img/become_a_patron_button.png" width="163" height="38" alt="Become a Patron!" loading="lazy"> | Syntax not understood |
| 133 | </a> | Syntax not understood |
| 134 | </div> | Syntax not understood |
| 135 | <p> | Syntax not understood |
| 136 | or <a class="external-link" href="http://www.patreon.com/oauth2/authorize?response_type=code&client_id=efdd32564c7459c2c0dcd644b984e6948070b23b72961a3b9fb32ab3ad797184&redirect_uri=https%3A%2F%2Fcaniuse.com">Log in</a> | Unknown directive |
| 137 | </p> | Syntax not understood |
| 138 | </div> | Syntax not understood |
| 140 | <div class="footer__section footer__links"> | Syntax not understood |
| 141 | <h3 class="footer__heading">Site links</h3> | Syntax not understood |
| 142 | <ol class="footer__list"> | Syntax not understood |
| 143 | <li class="footer__list-item"> | Syntax not understood |
| 144 | <a href="/">Home</a> | Syntax not understood |
| 145 | </li> | Syntax not understood |
| 146 | <li class="footer__list-item"> | Syntax not understood |
| 147 | <a href="/ciu/index">Feature index</a> | Syntax not understood |
| 148 | </li> | Syntax not understood |
| 149 | <li class="footer__list-item"> | Syntax not understood |
| 150 | <a href="/usage-table">Browser usage table</a> | Syntax not understood |
| 151 | </li> | Syntax not understood |
| 152 | <li class="footer__list-item"> | Syntax not understood |
| 153 | <a href="/issue-list">Feature suggestion list</a> | Syntax not understood |
| 154 | </li> | Syntax not understood |
| 155 | <li class="footer__list-item"> | Syntax not understood |
| 156 | <a href="https://github.com/fyrd/caniuse">Caniuse data on GitHub</a> | Unknown directive |
| 157 | </li> | Syntax not understood |
| 158 | </ol> | Syntax not understood |
| 159 | </div> | Syntax not understood |
| 161 | <div class="footer__section footer__legend"> | Syntax not understood |
| 162 | <section class="ciu-legend js-legend"> | Syntax not understood |
| 163 | <h2 class="ciu-legend__header">Legend</h2> | Syntax not understood |
| 164 | <ul class="ciu-legend__list"> | Syntax not understood |
| 165 | <li class="ciu-legend__item"> | Syntax not understood |
| 166 | <span class="y ciu-legend__color">Green</span> | Syntax not understood |
| 167 | <span class="ciu-legend__symbol">✅</span> | Syntax not understood |
| 168 | = Supported | Syntax not understood |
| 169 | </li> | Syntax not understood |
| 170 | <li class="ciu-legend__item"> | Syntax not understood |
| 171 | <span class="n ciu-legend__color">Red</span> | Syntax not understood |
| 172 | <span class="ciu-legend__symbol">❌</span> | Syntax not understood |
| 173 | = Not supported | Syntax not understood |
| 174 | </li> | Syntax not understood |
| 175 | <li class="ciu-legend__item"> | Syntax not understood |
| 176 | <span class="a ciu-legend__color">Greenish yellow</span> | Syntax not understood |
| 177 | <span class="ciu-legend__symbol">◐</span> | Syntax not understood |
| 178 | = Partial support | Syntax not understood |
| 179 | </li> | Syntax not understood |
| 180 | <li class="ciu-legend__item"> | Syntax not understood |
| 181 | <span class="u ciu-legend__color">Gray</span> | Syntax not understood |
| 182 | <span class="ciu-legend__symbol">﹖</span> | Syntax not understood |
| 183 | = Support unknown | Syntax not understood |
| 184 | </li> | Syntax not understood |
| 185 | </ul> | Syntax not understood |
| 186 | </section> | Syntax not understood |
| 187 | </div> | Syntax not understood |
| 188 | </footer> | Syntax not understood |
| 189 | </div><!-- /all --> | Syntax not understood |
| 190 | </body> | Syntax not understood |
| 191 | </html> | Syntax not understood |
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