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Results for https://flutter.dev

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Spain Spain · Madrid Completed: Apr 7, 2026 20:28 UTC
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Mobile 375 × 812

Screenshot of the audited page (Mobile 375×812)

Desktop 1440 × 900

Screenshot of the audited page (Desktop 1440×900)
C76

Site Health

Score: 76 / 100

Based on 8 categories, 0 sections

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

Top Priorities (5)

1

Content-Security-Policy header is missing

Security › Security Headers
2

No Content-Security-Policy header found

Security › Content Security Policy
3

Page weighs 14.9 MB (12.9 MB transferred)

Performance › Page Weight Budget
4

Cross-Origin-Embedder-Policy header is missing

Security › Security Headers
5

Cross-Origin-Opener-Policy header is missing

Security › Security Headers
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<a href="https://beavercheck.com/results/2dff06ac-21c9-aa92-589c-134fd43b72b4"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fflutter.dev" alt="BeaverCheck Score"></a>
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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

53
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

9.47 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

34.38 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

206 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

9.47 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

35.14 s

Detailed Report

Audit breakdown by category with detailed findings.

53

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

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

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

RequestCache TTLTransfer Size
flutter.dev/assets/hero-trivia-crack.f39579176518ba762b086a967ceffee5.png604800.0 s1.2 MiB
flutter.dev/assets/feature-productive.53fd3d6c01f4fca1cf8b6cdbfa6e1690.mp4604800.0 s1.2 MiB
flutter.dev/assets/feature-fast.909b8964f0e5e11075ab4fa3b5d20a7d.mp4604800.0 s838.1 KiB
flutter.dev/assets/hero-the-debertz.a52c98964e7c45b5e9f71595985690a6.png604800.0 s787.2 KiB
flutter.dev/main.client.dart.js3600.0 s63.4 KiB
flutter.dev/assets/stable-and-reliable.b4506fe2da0bee3c9718b8be5d15506b.jpg604800.0 s255.7 KiB
flutter.dev/assets/google-assistant-tablet.b8e1315ee5a6344a4ed448841e6bf53c.png604800.0 s241.8 KiB
/assets/whats-new-flutter-3-41-dart-3-11.957e6672c097c5fc...604800.0 s190.4 KiB
flutter.dev/main.css?hash=9cNOLXbDyJcD3600.0 s21.7 KiB
flutter.dev/assets/announcing-dart-3-8.w635.b23533c5ee84fd42b41e0da4569ffc28.png604800.0 s163.0 KiB
flutter.dev/assets/announcing-dart-3-9.w635.57225b0db07e00d2c29f7df4dad09268.png604800.0 s162.7 KiB
flutter.dev/assets/announcing-dart-3-7.w635.81d93b964a461bb554c47e91c57048b9.png604800.0 s162.6 KiB
/assets/developer-experience.w600.e285160842ad0ec5d52fd7c...604800.0 s159.5 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
/assets/gemini-android-studio-flutter.w635.697b9b706ddc4c...604800.0 s154.5 KiB
/assets/whats-new-flutter-3-35.w635.bf1e6edb9b971d313ea4f...604800.0 s143.2 KiB
flutter.dev/assets/flexible.6b0c42261323df3cdba2c4d4c1293e96.png604800.0 s134.4 KiB
flutter.dev/main.client.dart.js_19.part.js3600.0 s15.8 KiB
/assets/announcing-flutter-3-38-dart-3-10.w635.743c5c6cf3...604800.0 s124.0 KiB
flutter.dev/assets/capitalone.229a43d96abbf78ac7c7574906612922.svg604800.0 s122.8 KiB
flutter.dev/assets/movement-app.5040c306310ed3d4ba93a11d3d6facc2.png604800.0 s119.6 KiB
flutter.dev/assets/productive.61369f8510faa5f563eda14f9a5ff6d6.png604800.0 s109.6 KiB
flutter.dev/assets/sua-musica-app.34aea8930e35780f624d06b6a98151b2.png604800.0 s100.2 KiB
flutter.dev/assets/multi-platform.92f0a972a2eba5b0efb114c25f9cee00.jpg604800.0 s99.7 KiB
flutter.dev/assets/hero-bmw-mobile.94cb494ea9e4aeb62bd2bff7c0f14f39.png604800.0 s97.9 KiB
flutter.dev/assets/tencent.567ed8d92d9fbc68e0d5d4d7191bb50a.svg604800.0 s80.0 KiB
flutter.dev/main.client.dart.js_18.part.js3600.0 s9.7 KiB
flutter.dev/assets/get-started-background.05ad3ca19a2f2666f9368eee460aea0b.png604800.0 s75.2 KiB
flutter.dev/assets/fast.45fbf49d19c8fa342a214356992d74fb.png604800.0 s74.7 KiB
flutter.dev/assets/mgm-app.3bb2497411c3283662e0691b706f7ecc.jpg604800.0 s72.7 KiB
flutter.dev/assets/groupon.c667aef71757cca985a7b927333469eb.svg604800.0 s71.2 KiB
flutter.dev/assets/sonos.e005df3505351a3dd433e76522d7acca.svg604800.0 s70.2 KiB
flutter.dev/assets/nu-app.9e20cb7930d0a3286641e135312d1aeb.png604800.0 s58.0 KiB
flutter.dev/main.client.dart.js_16.part.js3600.0 s7.2 KiB
/assets/gpay-developer-story.w385.7012a35307ed8de20aca4db...604800.0 s57.2 KiB
flutter.dev/assets/abbeyroad.23d27f3c6c7a8de794dbf0aa42d4a8e1.svg604800.0 s56.3 KiB
flutter.dev/assets/grab.dc5bf5d55d0c40fd69e96e23bc7fc1d8.svg604800.0 s48.8 KiB
flutter.dev/assets/bmw.7156ff703f63f57817a209451b3b36e0.svg604800.0 s45.4 KiB
flutter.dev/assets/bytedance.d51a1a8d7585d5dfb9f3d8b3a18043a8.svg604800.0 s39.9 KiB
flutter.dev/main.client.dart.js_33.part.js3600.0 s4.9 KiB
flutter.dev/assets/flutter-2024-roadmap.a04966840885f110518c113c0182c45b.png604800.0 s35.9 KiB
/assets/seamless-integrations-home.64ff74fc52fcf6cbd62137...604800.0 s31.8 KiB
flutter.dev/assets/feature-flexible.49894296881c4ae30e96bed4aee6967c.mp4604800.0 s30.0 KiB
flutter.dev/assets/ebay.3705d281e7d6d2e4f61e03b4ce68ab70.svg604800.0 s26.0 KiB
flutter.dev/main.client.dart.js_5.part.js3600.0 s2.3 KiB
flutter.dev/main.client.dart.js_4.part.js3600.0 s2.2 KiB
flutter.dev/assets/whats-new-flutter-3-32.db2d1b7af3e7cabef09bfb1c802fdd89.webp604800.0 s14.3 KiB
flutter.dev/assets/philips-hue.e5fe6bdbb55fc5a4b4a5e4ed3d54db44.png604800.0 s12.9 KiB
flutter.dev/assets/flutter-at-io-2025.b9b960f052b4f8b9da905851056f52dc.webp604800.0 s12.4 KiB
flutter.dev/main.client.dart.js_1.part.js3600.0 s1.3 KiB
flutter.dev/main.client.dart.js_7.part.js3600.0 s1.0 KiB
flutter.dev/main.client.dart.js_22.part.js3600.0 s1003 B
flutter.dev/assets/flutter_logo.d0515092173211776ceed19b39c2a041.png604800.0 s7.4 KiB
flutter.dev/main.client.dart.js_12.part.js3600.0 s913 B
flutter.dev/main.client.dart.js_36.part.js3600.0 s857 B
flutter.dev/main.client.dart.js_28.part.js3600.0 s851 B
flutter.dev/main.client.dart.js_21.part.js3600.0 s837 B
flutter.dev/main.client.dart.js_3.part.js3600.0 s808 B
flutter.dev/main.client.dart.js_17.part.js3600.0 s795 B
flutter.dev/assets/dream11.352deaf10e3e3037e7abf46f2f803caf.svg604800.0 s6.0 KiB
flutter.dev/main.client.dart.js_8.part.js3600.0 s748 B
flutter.dev/main.client.dart.js_24.part.js3600.0 s725 B
flutter.dev/main.client.dart.js_25.part.js3600.0 s725 B
flutter.dev/main.client.dart.js_31.part.js3600.0 s724 B
flutter.dev/main.client.dart.js_34.part.js3600.0 s679 B
flutter.dev/main.client.dart.js_10.part.js3600.0 s634 B
flutter.dev/main.client.dart.js_15.part.js3600.0 s619 B
flutter.dev/assets/mgm.bf7edd6df44c8495b8ab6cf249d6a73f.svg604800.0 s2.5 KiB
flutter.dev/assets/alibaba.e786e4f856a7898b918aa6bed8a51115.svg604800.0 s2.0 KiB
flutter.dev/assets/flutter-logo.6ed04a8cd70b7aa540c6ec302a4e936c.svg604800.0 s2.0 KiB
flutter.dev/assets/flutter-logo-white.e4751c97b1621ac5d705e2fd662fc492.svg604800.0 s2.0 KiB
flutter.dev/assets/powered-by-dart.45386b11dc214c3b2bf657173034ec63.svg604800.0 s1.3 KiB
flutter.dev/assets/toyota.bf13533e890f3c8a078b5d82ec6f97aa.svg604800.0 s1.3 KiB
flutter.dev/assets/square.9fb506f56f2a61e46aa35b31a30a7418.svg604800.0 s1.3 KiB
flutter.dev/assets/emaar.65edd93f0a4a96f72bfb190cd00d5e81.svg604800.0 s1.1 KiB
flutter.dev/assets/nytimes.74906cb6ccd782a2804202b411594adf.svg604800.0 s1.1 KiB
flutter.dev/assets/nubank.e86e4dc6eb2ae79d2355fc49850bade4.svg604800.0 s1006 B
flutter.dev/assets/google.f34a21ce435731198bb05ed092f80cf1.svg604800.0 s896 B
flutter.dev/assets/feature-flexible.49894296881c4ae30e96bed4aee6967c.mp4604800.0 s0 B

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.

URLEst Savings
/s/materialsymbolsrounded/v325/sykO-zNym6YjUruM-QrEh7-nyT...240 ms
/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...75 ms
fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff260 ms

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

URLResource SizeEst Savings
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
flutter.dev/assets/hero-trivia-crack.f39579176518ba762b086a967ceffee5.png1.3 MiB796.3 KiB
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
flutter.dev/assets/hero-the-debertz.a52c98964e7c45b5e9f71595985690a6.png786.8 KiB678.1 KiB
Ecosystem div.features > div.feature > div.media > img
flutter.dev/assets/stable-and-reliable.b4506fe2da0bee3c9718b8be5d15506b.jpg255.9 KiB230.1 KiB
Developer experience div.features > div.feature > div.media > img
/assets/developer-experience.w600.e285160842ad0ec5d52fd7c...176.6 KiB133.9 KiB
Multi-platform div.features > div.feature > div.media > img
flutter.dev/assets/multi-platform.92f0a972a2eba5b0efb114c25f9cee00.jpg125.9 KiB88.5 KiB
Google Pay Developer Story section#developer-story > div.insert > div.media > img
/assets/gpay-developer-story.w385.7012a35307ed8de20aca4db...57.1 KiB34.3 KiB
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
flutter.dev/assets/mgm-app.3bb2497411c3283662e0691b706f7ecc.jpg74.3 KiB34.0 KiB
Seamless Integrations div.features > div.feature > div.media > img
/assets/seamless-integrations-home.64ff74fc52fcf6cbd62137...32.2 KiB18.4 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

lhId: page-8-DIV
nodeLabel: div.gallery > div.inner-fixed > div.col > div.card
path: 1,HTML,1,BODY,4,SECTION,0,MAIN,0,SECTION,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV
selector: div.gallery > div.inner-fixed > div.col > div.card
snippet: <div class="card card-a" style="background-image: url(&quot;/assets/hero-bmw-mobile.94cb494ea9e4aeb62bd2bff7c0f1…&quot;);">

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.

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.

URLTransfer SizeDuration
/css2?family=Material+Symbols+Rounded:opsz,wght,FILL,GRAD...514 B
fonts.googleapis.com/css?family=Roboto:300,400,5001.7 KiB177 ms
fonts.googleapis.com/css?family=Google+Sans:400,500,7002.3 KiB846 ms
fonts.googleapis.com/css2?family=Roboto+Mono:wght@400;500&display=swap1.1 KiB
www.gstatic.com/glue/cookienotificationbar/cookienotificationbar.min.css2.2 KiB832 ms
flutter.dev/main.css?hash=9cNOLXbDyJcD21.7 KiB450 ms

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.

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.

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.

Estimated savings: 1.9 s 395.9 KiB
URLTransfer SizeEst Savings
www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js362.4 KiB244.9 KiB
www.googletagmanager.com/gtag/js?id=G-04YGWK0175&cx=c&gtm=4e6460163.6 KiB64.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-ND4LWWZ135.0 KiB57.4 KiB
flutter.dev/main.client.dart.js63.2 KiB29.1 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

CategoryTime Spent
Other1.6 s
Script Evaluation1.0 s
Style & Layout690 ms
Script Parsing & Compilation232 ms
Rendering77 ms
Parse HTML & CSS53 ms

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.

Estimated savings: 0.0 ms 19.1 KiB
URLTransfer SizeEst Savings
flutter.dev/main.css?hash=9cNOLXbDyJcD21.6 KiB19.1 KiB

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

URLTransfer Size
flutter.dev/assets/feature-flexible.49894296881c4ae30e96bed4aee6967c.mp43.3 MiB
/s/materialsymbolsrounded/v325/sykO-zNym6YjUruM-QrEh7-nyT...1.3 MiB
flutter.dev/assets/hero-trivia-crack.f39579176518ba762b086a967ceffee5.png1.2 MiB
flutter.dev/assets/feature-productive.53fd3d6c01f4fca1cf8b6cdbfa6e1690.mp41.2 MiB
flutter.dev/assets/feature-fast.909b8964f0e5e11075ab4fa3b5d20a7d.mp4838.1 KiB
flutter.dev/assets/hero-the-debertz.a52c98964e7c45b5e9f71595985690a6.png787.2 KiB
www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js362.5 KiB
flutter.dev/assets/stable-and-reliable.b4506fe2da0bee3c9718b8be5d15506b.jpg255.7 KiB
flutter.dev/assets/google-assistant-tablet.b8e1315ee5a6344a4ed448841e6bf53c.png241.8 KiB
/assets/whats-new-flutter-3-41-dart-3-11.957e6672c097c5fc...190.4 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

URL
Multi-platform div.features > div.feature > div.media > img
flutter.dev/assets/multi-platform.92f0a972a2eba5b0efb114c25f9cee00.jpg
Ecosystem div.features > div.feature > div.media > img
flutter.dev/assets/stable-and-reliable.b4506fe2da0bee3c9718b8be5d15506b.jpg
Developer experience div.features > div.feature > div.media > img
/assets/developer-experience.w600.e285160842ad0ec5d52fd7c...
Seamless Integrations div.features > div.feature > div.media > img
/assets/seamless-integrations-home.64ff74fc52fcf6cbd62137...
Philips Hue div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/philips-hue.e5fe6bdbb55fc5a4b4a5e4ed3d54db44.png
Google Pay Developer Story section#developer-story > div.insert > div.media > img
/assets/gpay-developer-story.w385.7012a35307ed8de20aca4db...
Nubank div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/nubank.e86e4dc6eb2ae79d2355fc49850bade4.svg
Alibaba div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/alibaba.e786e4f856a7898b918aa6bed8a51115.svg
MGM div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/mgm.bf7edd6df44c8495b8ab6cf249d6a73f.svg
Google div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/google.f34a21ce435731198bb05ed092f80cf1.svg
NY Times div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/nytimes.74906cb6ccd782a2804202b411594adf.svg
Square div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/square.9fb506f56f2a61e46aa35b31a30a7418.svg
Emaar div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/emaar.65edd93f0a4a96f72bfb190cd00d5e81.svg
Toyota div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/toyota.bf13533e890f3c8a078b5d82ec6f97aa.svg
Byte Dance div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/bytedance.d51a1a8d7585d5dfb9f3d8b3a18043a8.svg
Dream11 div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/dream11.352deaf10e3e3037e7abf46f2f803caf.svg
Ebay div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/ebay.3705d281e7d6d2e4f61e03b4ce68ab70.svg
Groupon div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/groupon.c667aef71757cca985a7b927333469eb.svg
Tencent div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/tencent.567ed8d92d9fbc68e0d5d4d7191bb50a.svg
Sonos div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/sonos.e005df3505351a3dd433e76522d7acca.svg
Abbey Road div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/abbeyroad.23d27f3c6c7a8de794dbf0aa42d4a8e1.svg
Capitalone div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/capitalone.229a43d96abbf78ac7c7574906612922.svg
BMW div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/bmw.7156ff703f63f57817a209451b3b36e0.svg
Flutter div.content > div.logo > a > img
flutter.dev/assets/flutter-logo.6ed04a8cd70b7aa540c6ec302a4e936c.svg
Flutter div > div.logo > a > img
flutter.dev/assets/flutter-logo-white.e4751c97b1621ac5d705e2fd662fc492.svg
Grab div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/grab.dc5bf5d55d0c40fd69e96e23bc7fc1d8.svg

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

●Layout shift culprits
●Document request latency
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 5 user timings
●JavaScript execution time 1.2 s
●Avoid long main-thread tasks 13 long tasks found
●Avoid non-composited animations 5 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 30 ms
●Server Backend Latencies 40 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid multiple page redirects
●Initial server response time was short Root document took 0 ms
○INP breakdown
○Avoid large layout shifts
91

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Failing Elements
Fast div.tabs-content > div.tab-content > div.text > h3.text-green
Multi-platform div.feature > div.text > hgroup > h4.eyebrow
Developer experience div.feature > div.text > hgroup > h4.eyebrow
Stable & reliable div.feature > div.text > hgroup > h4.eyebrow

These are opportunities to improve the legibility of your content.

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.

Failing Elements
Dart section#dart > div.insert > div.text > h4.eyebrow
What's new in Flutter 3.41 and Dart 3.11 div.carousel-slider > div.carousel-card > a > h4

These are opportunities to improve keyboard navigation in your application.

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.

Failing Elements
arrow_circle_left div.carousel > div.carousel-progress > div.carousel-nav > a.disabled
arrow_circle_right div.carousel > div.carousel-progress > div.carousel-nav > 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
●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
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●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.
●Document has a main landmark.
●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.
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[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
○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
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○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.
92

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
Powered by Dart section#cta > div.insert > div.media > img
flutter.dev/assets/get-started-background.05ad3ca19a2f2666f9368eee460aea0b.png364 x 450 (0.81)972 x 808 (1.20)
Google Pay Developer Story section#developer-story > div.insert > div.media > img
/assets/gpay-developer-story.w385.7012a35307ed8de20aca4db...364 x 385 (0.95)385 x 385 (1.00)

General

Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.

Issue type
Content security policy
●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
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●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
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
○Detected JavaScript libraries
91

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.

Link destinationLink Text
policies.google.com/technologies/cookies?hl=enLearn more
flutter.dev/showcaseLearn more

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

○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`
○robots.txt is valid
○Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

587 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

5.47 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

7 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.160

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.43 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

5.58 s

Detailed Report

Audit breakdown by category with detailed findings.

68

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

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

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

RequestCache TTLTransfer Size
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flutter.dev/assets/feature-fast.909b8964f0e5e11075ab4fa3b5d20a7d.mp4604800.0 s838.1 KiB
flutter.dev/assets/hero-the-debertz.a52c98964e7c45b5e9f71595985690a6.png604800.0 s787.2 KiB
flutter.dev/main.client.dart.js3600.0 s63.6 KiB
flutter.dev/assets/stable-and-reliable.b4506fe2da0bee3c9718b8be5d15506b.jpg604800.0 s255.9 KiB
flutter.dev/assets/google-assistant-tablet.b8e1315ee5a6344a4ed448841e6bf53c.png604800.0 s241.8 KiB
/assets/whats-new-flutter-3-41-dart-3-11.957e6672c097c5fc...604800.0 s190.4 KiB
flutter.dev/main.css?hash=9cNOLXbDyJcD3600.0 s21.7 KiB
flutter.dev/assets/announcing-dart-3-8.w635.b23533c5ee84fd42b41e0da4569ffc28.png604800.0 s163.0 KiB
flutter.dev/assets/announcing-dart-3-9.w635.57225b0db07e00d2c29f7df4dad09268.png604800.0 s162.7 KiB
flutter.dev/assets/announcing-dart-3-7.w635.81d93b964a461bb554c47e91c57048b9.png604800.0 s162.6 KiB
/assets/developer-experience.w600.e285160842ad0ec5d52fd7c...604800.0 s159.6 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
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flutter.dev/assets/flexible.6b0c42261323df3cdba2c4d4c1293e96.png604800.0 s134.6 KiB
flutter.dev/main.client.dart.js_19.part.js3600.0 s15.8 KiB
/assets/announcing-flutter-3-38-dart-3-10.w635.743c5c6cf3...604800.0 s124.0 KiB
flutter.dev/assets/capitalone.229a43d96abbf78ac7c7574906612922.svg604800.0 s122.8 KiB
flutter.dev/assets/movement-app.5040c306310ed3d4ba93a11d3d6facc2.png604800.0 s119.6 KiB
flutter.dev/assets/productive.61369f8510faa5f563eda14f9a5ff6d6.png604800.0 s109.9 KiB
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flutter.dev/assets/multi-platform.92f0a972a2eba5b0efb114c25f9cee00.jpg604800.0 s99.9 KiB
flutter.dev/assets/hero-bmw-mobile.94cb494ea9e4aeb62bd2bff7c0f14f39.png604800.0 s97.9 KiB
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flutter.dev/main.client.dart.js_18.part.js3600.0 s9.7 KiB
flutter.dev/assets/get-started-background.05ad3ca19a2f2666f9368eee460aea0b.png604800.0 s75.2 KiB
flutter.dev/assets/fast.45fbf49d19c8fa342a214356992d74fb.png604800.0 s75.0 KiB
flutter.dev/assets/mgm-app.3bb2497411c3283662e0691b706f7ecc.jpg604800.0 s72.7 KiB
flutter.dev/assets/groupon.c667aef71757cca985a7b927333469eb.svg604800.0 s71.2 KiB
flutter.dev/assets/sonos.e005df3505351a3dd433e76522d7acca.svg604800.0 s70.2 KiB
flutter.dev/assets/nu-app.9e20cb7930d0a3286641e135312d1aeb.png604800.0 s58.0 KiB
flutter.dev/main.client.dart.js_16.part.js3600.0 s7.2 KiB
/assets/gpay-developer-story.w385.7012a35307ed8de20aca4db...604800.0 s57.4 KiB
flutter.dev/assets/abbeyroad.23d27f3c6c7a8de794dbf0aa42d4a8e1.svg604800.0 s56.2 KiB
flutter.dev/assets/grab.dc5bf5d55d0c40fd69e96e23bc7fc1d8.svg604800.0 s48.8 KiB
flutter.dev/assets/bmw.7156ff703f63f57817a209451b3b36e0.svg604800.0 s45.3 KiB
flutter.dev/assets/bytedance.d51a1a8d7585d5dfb9f3d8b3a18043a8.svg604800.0 s39.9 KiB
flutter.dev/main.client.dart.js_33.part.js3600.0 s4.9 KiB
flutter.dev/assets/flutter-2024-roadmap.a04966840885f110518c113c0182c45b.png604800.0 s35.9 KiB
/assets/seamless-integrations-home.64ff74fc52fcf6cbd62137...604800.0 s32.1 KiB
flutter.dev/assets/feature-flexible.49894296881c4ae30e96bed4aee6967c.mp4604800.0 s30.0 KiB
flutter.dev/assets/ebay.3705d281e7d6d2e4f61e03b4ce68ab70.svg604800.0 s26.0 KiB
flutter.dev/main.client.dart.js_5.part.js3600.0 s2.3 KiB
flutter.dev/main.client.dart.js_4.part.js3600.0 s2.2 KiB
flutter.dev/assets/whats-new-flutter-3-32.db2d1b7af3e7cabef09bfb1c802fdd89.webp604800.0 s14.3 KiB
flutter.dev/assets/philips-hue.e5fe6bdbb55fc5a4b4a5e4ed3d54db44.png604800.0 s12.9 KiB
flutter.dev/assets/flutter-at-io-2025.b9b960f052b4f8b9da905851056f52dc.webp604800.0 s12.4 KiB
flutter.dev/main.client.dart.js_1.part.js3600.0 s1.3 KiB
flutter.dev/main.client.dart.js_7.part.js3600.0 s1.0 KiB
flutter.dev/main.client.dart.js_22.part.js3600.0 s1003 B
flutter.dev/assets/flutter_logo.d0515092173211776ceed19b39c2a041.png604800.0 s7.4 KiB
flutter.dev/main.client.dart.js_12.part.js3600.0 s913 B
flutter.dev/main.client.dart.js_36.part.js3600.0 s858 B
flutter.dev/main.client.dart.js_28.part.js3600.0 s851 B
flutter.dev/main.client.dart.js_21.part.js3600.0 s836 B
flutter.dev/main.client.dart.js_3.part.js3600.0 s808 B
flutter.dev/main.client.dart.js_17.part.js3600.0 s794 B
flutter.dev/assets/dream11.352deaf10e3e3037e7abf46f2f803caf.svg604800.0 s6.0 KiB
flutter.dev/main.client.dart.js_8.part.js3600.0 s748 B
flutter.dev/main.client.dart.js_24.part.js3600.0 s725 B
flutter.dev/main.client.dart.js_31.part.js3600.0 s725 B
flutter.dev/main.client.dart.js_25.part.js3600.0 s724 B
flutter.dev/main.client.dart.js_34.part.js3600.0 s678 B
flutter.dev/main.client.dart.js_10.part.js3600.0 s633 B
flutter.dev/main.client.dart.js_15.part.js3600.0 s619 B
flutter.dev/assets/mgm.bf7edd6df44c8495b8ab6cf249d6a73f.svg604800.0 s2.5 KiB
flutter.dev/assets/alibaba.e786e4f856a7898b918aa6bed8a51115.svg604800.0 s2.3 KiB
flutter.dev/assets/flutter-logo.6ed04a8cd70b7aa540c6ec302a4e936c.svg604800.0 s2.0 KiB
flutter.dev/assets/flutter-logo-white.e4751c97b1621ac5d705e2fd662fc492.svg604800.0 s2.0 KiB
flutter.dev/assets/powered-by-dart.45386b11dc214c3b2bf657173034ec63.svg604800.0 s1.3 KiB
flutter.dev/assets/toyota.bf13533e890f3c8a078b5d82ec6f97aa.svg604800.0 s1.3 KiB
flutter.dev/assets/square.9fb506f56f2a61e46aa35b31a30a7418.svg604800.0 s1.3 KiB
flutter.dev/assets/emaar.65edd93f0a4a96f72bfb190cd00d5e81.svg604800.0 s1.1 KiB
flutter.dev/assets/nytimes.74906cb6ccd782a2804202b411594adf.svg604800.0 s1.1 KiB
flutter.dev/assets/nubank.e86e4dc6eb2ae79d2355fc49850bade4.svg604800.0 s1006 B
flutter.dev/assets/google.f34a21ce435731198bb05ed092f80cf1.svg604800.0 s896 B
flutter.dev/assets/feature-flexible.49894296881c4ae30e96bed4aee6967c.mp4604800.0 s0 B

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.

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:0.15998300000000001] map[node:map[boundingRect:map[bottom:1132 height:764 left:491 right:859 top:368 width:368] lhId:page-11-DIV nodeLabel:div.gallery > div.inner-fixed > div.col > div.card path:1,HTML,1,BODY,4,SECTION,0,MAIN,0,SECTION,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV selector:div.gallery > div.inner-fixed > div.col > div.card snippet:<div class="card card-a" style="background-image: url(&quot;/assets/hero-bmw-mobile.94cb494ea9e4aeb62bd2bff7c0f1…&quot;);"> type:node] score:0.049747 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/materialsymbolsrounded/v325/sykO-zNym6YjUruM-QrEh7-nyTnjDwKNJ_190FjpZIvLgyidOK7BDB_Qb9vUe2jjwjHK-P3BukXXkRzDgw.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:1132 height:764 left:491 right:859 top:368 width:368] lhId:page-11-DIV nodeLabel:div.gallery > div.inner-fixed > div.col > div.card path:1,HTML,1,BODY,4,SECTION,0,MAIN,0,SECTION,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV selector:div.gallery > div.inner-fixed > div.col > div.card snippet:<div class="card card-a" style="background-image: url(&quot;/assets/hero-bmw-mobile.94cb494ea9e4aeb62bd2bff7c0f1…&quot;);"> type:node] score:0.036018] map[node:map[boundingRect:map[bottom:1132 height:764 left:491 right:859 top:368 width:368] lhId:page-11-DIV nodeLabel:div.gallery > div.inner-fixed > div.col > div.card path:1,HTML,1,BODY,4,SECTION,0,MAIN,0,SECTION,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV selector:div.gallery > div.inner-fixed > div.col > div.card snippet:<div class="card card-a" style="background-image: url(&quot;/assets/hero-bmw-mobile.94cb494ea9e4aeb62bd2bff7c0f1…&quot;);"> type:node] score:0.01672] map[node:map[boundingRect:map[bottom:1132 height:764 left:491 right:859 top:368 width:368] lhId:page-11-DIV nodeLabel:div.gallery > div.inner-fixed > div.col > div.card path:1,HTML,1,BODY,4,SECTION,0,MAIN,0,SECTION,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV selector:div.gallery > div.inner-fixed > div.col > div.card snippet:<div class="card card-a" style="background-image: url(&quot;/assets/hero-bmw-mobile.94cb494ea9e4aeb62bd2bff7c0f1…&quot;);"> type:node] score:0.014491] map[node:map[boundingRect:map[bottom:1132 height:764 left:491 right:859 top:368 width:368] lhId:page-11-DIV nodeLabel:div.gallery > div.inner-fixed > div.col > div.card path:1,HTML,1,BODY,4,SECTION,0,MAIN,0,SECTION,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV selector:div.gallery > div.inner-fixed > div.col > div.card snippet:<div class="card card-a" style="background-image: url(&quot;/assets/hero-bmw-mobile.94cb494ea9e4aeb62bd2bff7c0f1…&quot;);"> type:node] score:0.008034]]

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.

URLEst Savings
/s/materialsymbolsrounded/v325/sykO-zNym6YjUruM-QrEh7-nyT...230 ms
/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...70 ms
fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff265 ms

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

URLResource SizeEst Savings
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
flutter.dev/assets/hero-trivia-crack.f39579176518ba762b086a967ceffee5.png1.3 MiB796.3 KiB
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
flutter.dev/assets/hero-the-debertz.a52c98964e7c45b5e9f71595985690a6.png786.8 KiB678.1 KiB
Ecosystem div.features > div.feature > div.media > img
flutter.dev/assets/stable-and-reliable.b4506fe2da0bee3c9718b8be5d15506b.jpg255.9 KiB212.8 KiB
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
flutter.dev/assets/google-assistant-tablet.b8e1315ee5a6344a4ed448841e6bf53c.png242.7 KiB148.9 KiB
Developer experience div.features > div.feature > div.media > img
/assets/developer-experience.w600.e285160842ad0ec5d52fd7c...176.6 KiB116.6 KiB
Multi-platform div.features > div.feature > div.media > img
flutter.dev/assets/multi-platform.92f0a972a2eba5b0efb114c25f9cee00.jpg125.9 KiB81.1 KiB
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
flutter.dev/assets/sua-musica-app.34aea8930e35780f624d06b6a98151b2.png101.7 KiB59.6 KiB
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
flutter.dev/assets/mgm-app.3bb2497411c3283662e0691b706f7ecc.jpg74.3 KiB34.0 KiB
Google Pay Developer Story section#developer-story > div.insert > div.media > img
/assets/gpay-developer-story.w385.7012a35307ed8de20aca4db...57.1 KiB33.0 KiB
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
flutter.dev/assets/nu-app.9e20cb7930d0a3286641e135312d1aeb.png59.0 KiB19.2 KiB
Seamless Integrations div.features > div.feature > div.media > img
/assets/seamless-integrations-home.64ff74fc52fcf6cbd62137...32.2 KiB9.4 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

lhId: page-1-DIV
nodeLabel: div.gallery > div.inner-fixed > div.col > div.card
path: 1,HTML,1,BODY,4,SECTION,0,MAIN,0,SECTION,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV
selector: div.gallery > div.inner-fixed > div.col > div.card
snippet: <div class="card card-a" style="background-image: url(&quot;/assets/hero-the-debertz.a52c98964e7c45b5e9f71595985…&quot;);">

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.

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
value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

URLTransfer SizeDuration
fonts.googleapis.com/css?family=Google+Sans:400,500,7002.2 KiB293 ms
fonts.googleapis.com/css2?family=Roboto+Mono:wght@400;500&display=swap755 B
/css2?family=Material+Symbols+Rounded:opsz,wght,FILL,GRAD...514 B
fonts.googleapis.com/css?family=Roboto:300,400,5002.1 KiB69 ms
www.gstatic.com/glue/cookienotificationbar/cookienotificationbar.min.css2.2 KiB286 ms
flutter.dev/main.css?hash=9cNOLXbDyJcD21.7 KiB80 ms

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

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

ElementLayout shift score
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.050
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.036
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.017
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.014
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.008
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.006
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.006
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.006
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.005
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.003
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.002
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.002
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.001
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.001
div.gallery > div.inner-fixed > div.col > div.card div.gallery > div.inner-fixed > div.col > div.card
0.001

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.

TTI

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.

Estimated savings: 60 ms 396.6 KiB
URLTransfer SizeEst Savings
www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js362.4 KiB244.9 KiB
www.googletagmanager.com/gtag/js?id=G-04YGWK0175&cx=c&gtm=4e6460163.6 KiB65.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-ND4LWWZ135.0 KiB57.4 KiB
flutter.dev/main.client.dart.js63.2 KiB29.1 KiB

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

Estimated savings: 0.0 ms 18.8 KiB
URLTransfer SizeEst Savings
flutter.dev/main.css?hash=9cNOLXbDyJcD21.6 KiB18.8 KiB

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

URLTransfer Size
flutter.dev/assets/feature-flexible.49894296881c4ae30e96bed4aee6967c.mp42.3 MiB
/s/materialsymbolsrounded/v325/sykO-zNym6YjUruM-QrEh7-nyT...1.3 MiB
flutter.dev/assets/hero-trivia-crack.f39579176518ba762b086a967ceffee5.png1.2 MiB
flutter.dev/assets/feature-productive.53fd3d6c01f4fca1cf8b6cdbfa6e1690.mp41.2 MiB
flutter.dev/assets/feature-fast.909b8964f0e5e11075ab4fa3b5d20a7d.mp4838.1 KiB
flutter.dev/assets/hero-the-debertz.a52c98964e7c45b5e9f71595985690a6.png787.2 KiB
www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js362.5 KiB
flutter.dev/assets/stable-and-reliable.b4506fe2da0bee3c9718b8be5d15506b.jpg255.9 KiB
flutter.dev/assets/google-assistant-tablet.b8e1315ee5a6344a4ed448841e6bf53c.png241.8 KiB
/assets/whats-new-flutter-3-41-dart-3-11.957e6672c097c5fc...190.4 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

URL
Multi-platform div.features > div.feature > div.media > img
flutter.dev/assets/multi-platform.92f0a972a2eba5b0efb114c25f9cee00.jpg
Ecosystem div.features > div.feature > div.media > img
flutter.dev/assets/stable-and-reliable.b4506fe2da0bee3c9718b8be5d15506b.jpg
Developer experience div.features > div.feature > div.media > img
/assets/developer-experience.w600.e285160842ad0ec5d52fd7c...
Seamless Integrations div.features > div.feature > div.media > img
/assets/seamless-integrations-home.64ff74fc52fcf6cbd62137...
Philips Hue div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/philips-hue.e5fe6bdbb55fc5a4b4a5e4ed3d54db44.png
Nubank div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/nubank.e86e4dc6eb2ae79d2355fc49850bade4.svg
Alibaba div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/alibaba.e786e4f856a7898b918aa6bed8a51115.svg
MGM div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/mgm.bf7edd6df44c8495b8ab6cf249d6a73f.svg
Google div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/google.f34a21ce435731198bb05ed092f80cf1.svg
NY Times div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/nytimes.74906cb6ccd782a2804202b411594adf.svg
Square div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/square.9fb506f56f2a61e46aa35b31a30a7418.svg
Emaar div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/emaar.65edd93f0a4a96f72bfb190cd00d5e81.svg
Toyota div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/toyota.bf13533e890f3c8a078b5d82ec6f97aa.svg
Byte Dance div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/bytedance.d51a1a8d7585d5dfb9f3d8b3a18043a8.svg
Dream11 div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/dream11.352deaf10e3e3037e7abf46f2f803caf.svg
Ebay div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/ebay.3705d281e7d6d2e4f61e03b4ce68ab70.svg
Groupon div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/groupon.c667aef71757cca985a7b927333469eb.svg
Tencent div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/tencent.567ed8d92d9fbc68e0d5d4d7191bb50a.svg
Sonos div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/sonos.e005df3505351a3dd433e76522d7acca.svg
Abbey Road div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/abbeyroad.23d27f3c6c7a8de794dbf0aa42d4a8e1.svg
Capitalone div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/capitalone.229a43d96abbf78ac7c7574906612922.svg
BMW div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/bmw.7156ff703f63f57817a209451b3b36e0.svg
Flutter div.content > div.logo > a > img
flutter.dev/assets/flutter-logo.6ed04a8cd70b7aa540c6ec302a4e936c.svg
Flutter div > div.logo > a > img
flutter.dev/assets/flutter-logo-white.e4751c97b1621ac5d705e2fd662fc492.svg
Grab div.inner-fixed > div.logo-col > div > img
flutter.dev/assets/grab.dc5bf5d55d0c40fd69e96e23bc7fc1d8.svg

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

●Document request latency
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Max Potential First Input Delay 60 ms
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 5 user timings
●JavaScript execution time 0.2 s
●Minimizes main-thread work 0.9 s
●Avoid long main-thread tasks 2 long tasks found
●Avoid non-composited animations 5 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 40 ms
●Server Backend Latencies 40 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid multiple page redirects
●Initial server response time was short Root document took 0 ms
○INP breakdown
91

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Failing Elements
Multi-platform div.feature > div.text > hgroup > h4.eyebrow
Developer experience div.feature > div.text > hgroup > h4.eyebrow

These are opportunities to improve the legibility of your content.

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.

Failing Elements
Dart section#dart > div.insert > div.text > h4.eyebrow
What's new in Flutter 3.41 and Dart 3.11 div.carousel-slider > div.carousel-card > a > h4

These are opportunities to improve keyboard navigation in your application.

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.

Failing Elements
arrow_circle_left div.carousel > div.carousel-progress > div.carousel-nav > a.disabled
arrow_circle_right div.carousel > div.carousel-progress > div.carousel-nav > 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
●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
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●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.
●Document has a main landmark.
●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.
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[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
○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
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○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.
96

Best Practices

General

Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.

Issue type
Content security policy
●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
●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
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
○Detected JavaScript libraries
91

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.

Link destinationLink Text
policies.google.com/technologies/cookies?hl=enLearn more
flutter.dev/showcaseLearn more

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

○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`
○robots.txt is valid
○Document has a valid `rel=canonical`

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