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report.json
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report.json
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{
"userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/76.0.3809.87 Safari/537.36",
"environment": {
"networkUserAgent": "Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5 Build/MRA58N) AppleWebKit/537.36(KHTML, like Gecko) Chrome/71.0.3559.0 Mobile Safari/537.36",
"hostUserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/76.0.3809.87 Safari/537.36",
"benchmarkIndex": 1672
},
"lighthouseVersion": "3.2.1",
"fetchTime": "2019-07-31T18:25:07.131Z",
"requestedUrl": "http://127.0.0.1:4001/",
"finalUrl": "http://127.0.0.1:4001/",
"runWarnings": [
"Lighthouse was unable to reliably load the page you requested. Make sure you are testing the correct URL and that the server is properly responding to all requests. net::ERR_CONNECTION_REFUSED."
],
"runtimeError": {
"code": "FAILED_DOCUMENT_REQUEST",
"message": "Lighthouse was unable to reliably load the page you requested. Make sure you are testing the correct URL and that the server is properly responding to all requests. net::ERR_CONNECTION_REFUSED."
},
"audits": {
"is-on-https": {
"id": "is-on-https",
"title": "Uses HTTPS",
"description": "All sites should be protected with HTTPS, even ones that don't handle sensitive data. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/https).",
"score": 1,
"scoreDisplayMode": "binary",
"rawValue": true,
"displayValue": "",
"details": {
"type": "table",
"headings": [],
"items": []
}
},
"redirects-http": {
"id": "redirects-http",
"title": "Does not redirect HTTP traffic to HTTPS",
"description": "If you've already set up HTTPS, make sure that you redirect all HTTP traffic to HTTPS. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/http-redirects-to-https).",
"score": 0,
"scoreDisplayMode": "binary",
"rawValue": false
},
"service-worker": {
"id": "service-worker",
"title": "Does not register a service worker",
"description": "The service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/registered-service-worker).",
"score": 0,
"scoreDisplayMode": "binary",
"rawValue": false
},
"works-offline": {
"id": "works-offline",
"title": "Does not respond with a 200 when offline",
"description": "If you're building a Progressive Web App, consider using a service worker so that your app can work offline. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/http-200-when-offline).",
"score": 0,
"scoreDisplayMode": "binary",
"rawValue": false,
"warnings": []
},
"viewport": {
"id": "viewport",
"title": "Does not have a `<meta name=\"viewport\">` tag with `width` or `initial-scale`",
"description": "Add a viewport meta tag to optimize your app for mobile screens. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/has-viewport-meta-tag).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Viewport gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"without-javascript": {
"id": "without-javascript",
"title": "Does not provide fallback content when JavaScript is not available",
"description": "Your app should display some content when JavaScript is disabled, even if it's just a warning to the user that JavaScript is required to use the app. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/no-js).",
"score": 0,
"scoreDisplayMode": "binary",
"rawValue": false,
"explanation": "The page body should render some content if its scripts are not available."
},
"first-contentful-paint": {
"id": "first-contentful-paint",
"title": "First Contentful Paint",
"description": "First Contentful Paint marks the time at which the first text or image is painted. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/first-contentful-paint).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"first-meaningful-paint": {
"id": "first-meaningful-paint",
"title": "First Meaningful Paint",
"description": "First Meaningful Paint measures when the primary content of a page is visible. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/first-meaningful-paint).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"load-fast-enough-for-pwa": {
"id": "load-fast-enough-for-pwa",
"title": "Page load is not fast enough on 3G",
"description": "A fast page load over a 3G network ensures a good mobile user experience. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/fast-3g).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"speed-index": {
"id": "speed-index",
"title": "Speed Index",
"description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/speed-index).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"screenshot-thumbnails": {
"id": "screenshot-thumbnails",
"title": "Screenshot Thumbnails",
"description": "This is what the load of your site looked like.",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"final-screenshot": {
"id": "final-screenshot",
"title": "Final Screenshot",
"description": "The last screenshot captured of the pageload.",
"score": null,
"scoreDisplayMode": "informative",
"rawValue": true,
"details": {
"type": "screenshot",
"timestamp": 511246715.98,
"data": "data:image/jpeg;base64,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"
}
},
"estimated-input-latency": {
"id": "estimated-input-latency",
"title": "Estimated Input Latency",
"description": "The score above is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/estimated-input-latency).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"errors-in-console": {
"id": "errors-in-console",
"title": "Browser errors were logged to the console",
"description": "Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns.",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required ChromeConsoleMessages gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"time-to-first-byte": {
"id": "time-to-first-byte",
"title": "Server response times are low (TTFB)",
"description": "Time To First Byte identifies the time at which your server sends a response. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/ttfb).",
"score": 1,
"scoreDisplayMode": "binary",
"rawValue": 0,
"displayValue": "Root document took 0 ms",
"details": {
"type": "opportunity",
"overallSavingsMs": -600,
"headings": [],
"items": []
}
},
"first-cpu-idle": {
"id": "first-cpu-idle",
"title": "First CPU Idle",
"description": "First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/first-interactive).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"interactive": {
"id": "interactive",
"title": "Time to Interactive",
"description": "Interactive marks the time at which the page is fully interactive. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/consistently-interactive).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"user-timings": {
"id": "user-timings",
"title": "User Timing marks and measures",
"description": "Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/user-timing).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"critical-request-chains": {
"id": "critical-request-chains",
"title": "Minimize Critical Requests Depth",
"description": "The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/critical-request-chains).",
"score": null,
"scoreDisplayMode": "not-applicable",
"rawValue": true,
"displayValue": "",
"details": {
"type": "criticalrequestchain",
"chains": {
"8F43DBB14A4BA81FA79ED7AA10244176": {
"request": {
"url": "http://127.0.0.1:4001/",
"startTime": 511246.637514,
"endTime": 511246.644484,
"responseReceivedTime": -1,
"transferSize": 0
},
"children": {}
}
},
"longestChain": {
"duration": 6.969999987632036,
"length": 1,
"transferSize": 0
}
}
},
"redirects": {
"id": "redirects",
"title": "Avoid multiple page redirects",
"description": "Redirects introduce additional delays before the page can be loaded. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/redirects).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"webapp-install-banner": {
"id": "webapp-install-banner",
"title": "User will not be prompted to Install the Web App",
"description": "Browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/install-prompt).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Manifest gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"splash-screen": {
"id": "splash-screen",
"title": "Is not configured for a custom splash screen",
"description": "A themed splash screen ensures a high-quality experience when users launch your app from their homescreens. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/custom-splash-screen).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Manifest gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"themed-omnibox": {
"id": "themed-omnibox",
"title": "Address bar does not match brand colors",
"description": "The browser address bar can be themed to match your site. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/address-bar).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Manifest gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"manifest-short-name-length": {
"id": "manifest-short-name-length",
"title": "The `short_name` will be truncated on the homescreen",
"description": "Make your app's `short_name` fewer than 12 characters to ensure that it's not truncated on homescreens. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/manifest-short_name-is-not-truncated).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Manifest gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"content-width": {
"id": "content-width",
"title": "Content is not sized correctly for the viewport",
"description": "If the width of your app's content doesn't match the width of the viewport, your app might not be optimized for mobile screens. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/content-sized-correctly-for-viewport).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required ViewportDimensions gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"image-aspect-ratio": {
"id": "image-aspect-ratio",
"title": "Displays images with incorrect aspect ratio",
"description": "Image display dimensions should match natural aspect ratio. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/aspect-ratio).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required ImageUsage gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"deprecations": {
"id": "deprecations",
"title": "Uses deprecated APIs",
"description": "Deprecated APIs will eventually be removed from the browser. [Learn more](https://www.chromestatus.com/features#deprecated).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required ChromeConsoleMessages gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"mainthread-work-breakdown": {
"id": "mainthread-work-breakdown",
"title": "Minimize main-thread work",
"description": "Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this.",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"bootup-time": {
"id": "bootup-time",
"title": "Reduce JavaScript execution time",
"description": "Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/bootup).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"uses-rel-preload": {
"id": "uses-rel-preload",
"title": "Preload key requests",
"description": "Consider using <link rel=preload> to prioritize fetching resources that are currently requested later in page load. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/preload).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"uses-rel-preconnect": {
"id": "uses-rel-preconnect",
"title": "Preconnect to required origins",
"description": "Consider adding preconnect or dns-prefetch resource hints to establish early connections to important third-party origins. [Learn more](https://developers.google.com/web/fundamentals/performance/resource-prioritization#preconnect).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: No timing information available"
},
"font-display": {
"id": "font-display",
"title": "Ensure text remains visible during webfont load",
"description": "Leverage the font-display CSS feature to ensure text is user-visible while webfonts are loading. [Learn more](https://developers.google.com/web/updates/2016/02/font-display).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Fonts gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"network-requests": {
"id": "network-requests",
"title": "Network Requests",
"description": "Lists the network requests that were made during page load.",
"score": null,
"scoreDisplayMode": "informative",
"rawValue": 1,
"details": {
"type": "table",
"headings": [
{
"key": "url",
"itemType": "url",
"text": "URL"
},
{
"key": "startTime",
"itemType": "ms",
"granularity": 1,
"text": "Start Time"
},
{
"key": "endTime",
"itemType": "ms",
"granularity": 1,
"text": "End Time"
},
{
"key": "transferSize",
"itemType": "bytes",
"displayUnit": "kb",
"granularity": 1,
"text": "Transfer Size"
},
{
"key": "statusCode",
"itemType": "text",
"text": "Status Code"
},
{
"key": "mimeType",
"itemType": "text",
"text": "MIME Type"
},
{
"key": "resourceType",
"itemType": "text",
"text": "Resource Type"
}
],
"items": [
{
"url": "http://127.0.0.1:4001/",
"startTime": 0,
"endTime": 6.969999987632036,
"transferSize": 0,
"statusCode": -1,
"mimeType": "",
"resourceType": "Document"
}
]
}
},
"metrics": {
"id": "metrics",
"title": "Metrics",
"description": "Collects all available metrics.",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"pwa-cross-browser": {
"id": "pwa-cross-browser",
"title": "Site works cross-browser",
"description": "To reach the most number of users, sites should work across every major browser. [Learn more](https://developers.google.com/web/progressive-web-apps/checklist#site-works-cross-browser).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"pwa-page-transitions": {
"id": "pwa-page-transitions",
"title": "Page transitions don't feel like they block on the network",
"description": "Transitions should feel snappy as you tap around, even on a slow network, a key to perceived performance. [Learn more](https://developers.google.com/web/progressive-web-apps/checklist#page-transitions-dont-feel-like-they-block-on-the-network).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"pwa-each-page-has-url": {
"id": "pwa-each-page-has-url",
"title": "Each page has a URL",
"description": "Ensure individual pages are deep linkable via the URLs and that URLs are unique for the purpose of shareability on social media. [Learn more](https://developers.google.com/web/progressive-web-apps/checklist#each-page-has-a-url).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"accesskeys": {
"id": "accesskeys",
"title": "`[accesskey]` values are not unique",
"description": "Access keys let users quickly focus a part of the page. For proper navigation, each access key must be unique. [Learn more](https://dequeuniversity.com/rules/axe/2.2/accesskeys?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"aria-allowed-attr": {
"id": "aria-allowed-attr",
"title": "`[aria-*]` attributes do not match their roles",
"description": "Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. [Learn more](https://dequeuniversity.com/rules/axe/2.2/aria-allowed-attr?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"aria-required-attr": {
"id": "aria-required-attr",
"title": "`[role]`s do not have all required `[aria-*]` attributes",
"description": "Some ARIA roles have required attributes that describe the state of the element to screen readers. [Learn more](https://dequeuniversity.com/rules/axe/2.2/aria-required-attr?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"aria-required-children": {
"id": "aria-required-children",
"title": "Elements with `[role]` that require specific children `[role]`s, are missing.",
"description": "Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. [Learn more](https://dequeuniversity.com/rules/axe/2.2/aria-required-children?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"aria-required-parent": {
"id": "aria-required-parent",
"title": "`[role]`s are not contained by their required parent element",
"description": "Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. [Learn more](https://dequeuniversity.com/rules/axe/2.2/aria-required-parent?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"aria-roles": {
"id": "aria-roles",
"title": "`[role]` values are not valid",
"description": "ARIA roles must have valid values in order to perform their intended accessibility functions. [Learn more](https://dequeuniversity.com/rules/axe/2.2/aria-roles?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"aria-valid-attr-value": {
"id": "aria-valid-attr-value",
"title": "`[aria-*]` attributes do not have valid values",
"description": "Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid values. [Learn more](https://dequeuniversity.com/rules/axe/2.2/aria-valid-attr-value?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"aria-valid-attr": {
"id": "aria-valid-attr",
"title": "`[aria-*]` attributes are not valid or misspelled",
"description": "Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid names. [Learn more](https://dequeuniversity.com/rules/axe/2.2/aria-valid-attr?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"audio-caption": {
"id": "audio-caption",
"title": "`<audio>` elements are missing a `<track>` element with `[kind=\"captions\"]`.",
"description": "Captions make audio elements usable for deaf or hearing-impaired users, providing critical information such as who is talking, what they're saying, and other non-speech information. [Learn more](https://dequeuniversity.com/rules/axe/2.2/audio-caption?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"button-name": {
"id": "button-name",
"title": "Buttons do not have an accessible name",
"description": "When a button doesn't have an accessible name, screen readers announce it as \"button\", making it unusable for users who rely on screen readers. [Learn more](https://dequeuniversity.com/rules/axe/2.2/button-name?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"bypass": {
"id": "bypass",
"title": "The page does not contain a heading, skip link, or landmark region",
"description": "Adding ways to bypass repetitive content lets keyboard users navigate the page more efficiently. [Learn more](https://dequeuniversity.com/rules/axe/2.2/bypass?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"color-contrast": {
"id": "color-contrast",
"title": "Background and foreground colors do not have a sufficient contrast ratio.",
"description": "Low-contrast text is difficult or impossible for many users to read. [Learn more](https://dequeuniversity.com/rules/axe/2.2/color-contrast?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"definition-list": {
"id": "definition-list",
"title": "`<dl>`'s do not contain only properly-ordered `<dt>` and `<dd>` groups, `<script>` or `<template>` elements.",
"description": "When definition lists are not properly marked up, screen readers may produce confusing or inaccurate output. [Learn more](https://dequeuniversity.com/rules/axe/2.2/definition-list?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"dlitem": {
"id": "dlitem",
"title": "Definition list items are not wrapped in `<dl>` elements",
"description": "Definition list items (`<dt>` and `<dd>`) must be wrapped in a parent `<dl>` element to ensure that screen readers can properly announce them. [Learn more](https://dequeuniversity.com/rules/axe/2.2/dlitem?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"document-title": {
"id": "document-title",
"title": "Document doesn't have a `<title>` element",
"description": "The title gives screen reader users an overview of the page, and search engine users rely on it heavily to determine if a page is relevant to their search. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/title).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"duplicate-id": {
"id": "duplicate-id",
"title": "`[id]` attributes on the page are not unique",
"description": "The value of an id attribute must be unique to prevent other instances from being overlooked by assistive technologies. [Learn more](https://dequeuniversity.com/rules/axe/2.2/duplicate-id?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"frame-title": {
"id": "frame-title",
"title": "`<frame>` or `<iframe>` elements do not have a title",
"description": "Screen reader users rely on frame titles to describe the contents of frames. [Learn more](https://dequeuniversity.com/rules/axe/2.2/frame-title?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"html-has-lang": {
"id": "html-has-lang",
"title": "`<html>` element does not have a `[lang]` attribute",
"description": "If a page doesn't specify a lang attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. [Learn more](https://dequeuniversity.com/rules/axe/2.2/html-lang?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"html-lang-valid": {
"id": "html-lang-valid",
"title": "`<html>` element does not have a valid value for its `[lang]` attribute.",
"description": "Specifying a valid [BCP 47 language](https://www.w3.org/International/questions/qa-choosing-language-tags#question) helps screen readers announce text properly. [Learn more](https://dequeuniversity.com/rules/axe/2.2/valid-lang?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"image-alt": {
"id": "image-alt",
"title": "Image elements do not have `[alt]` attributes",
"description": "Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. [Learn more](https://dequeuniversity.com/rules/axe/2.2/image-alt?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"input-image-alt": {
"id": "input-image-alt",
"title": "`<input type=\"image\">` elements do not have `[alt]` text",
"description": "When an image is being used as an `<input>` button, providing alternative text can help screen reader users understand the purpose of the button. [Learn more](https://dequeuniversity.com/rules/axe/2.2/input-image-alt?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"label": {
"id": "label",
"title": "Form elements do not have associated labels",
"description": "Labels ensure that form controls are announced properly by assistive technologies, like screen readers. [Learn more](https://dequeuniversity.com/rules/axe/2.2/label?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"layout-table": {
"id": "layout-table",
"title": "Presentational `<table>` elements do not avoid using `<th>`, `<caption>` or the `[summary]` attribute.",
"description": "A table being used for layout purposes should not include data elements, such as the th or caption elements or the summary attribute, because this can create a confusing experience for screen reader users. [Learn more](https://dequeuniversity.com/rules/axe/2.2/layout-table?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"link-name": {
"id": "link-name",
"title": "Links do not have a discernible name",
"description": "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 more](https://dequeuniversity.com/rules/axe/2.2/link-name?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"list": {
"id": "list",
"title": "Lists do not contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).",
"description": "Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. [Learn more](https://dequeuniversity.com/rules/axe/2.2/list?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"listitem": {
"id": "listitem",
"title": "List items (`<li>`) are not contained within `<ul>` or `<ol>` parent elements.",
"description": "Screen readers require list items (`<li>`) to be contained within a parent `<ul>` or `<ol>` to be announced properly. [Learn more](https://dequeuniversity.com/rules/axe/2.2/listitem?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"meta-refresh": {
"id": "meta-refresh",
"title": "The document uses `<meta http-equiv=\"refresh\">`",
"description": "Users do not expect a page to refresh automatically, and doing so will move focus back to the top of the page. This may create a frustrating or confusing experience. [Learn more](https://dequeuniversity.com/rules/axe/2.2/meta-refresh?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"meta-viewport": {
"id": "meta-viewport",
"title": "`[user-scalable=\"no\"]` is used in the `<meta name=\"viewport\">` element or the `[maximum-scale]` attribute is less than 5.",
"description": "Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. [Learn more](https://dequeuniversity.com/rules/axe/2.2/meta-viewport?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"object-alt": {
"id": "object-alt",
"title": "`<object>` elements do not have `[alt]` text",
"description": "Screen readers cannot translate non-text content. Adding alt text to `<object>` elements helps screen readers convey meaning to users. [Learn more](https://dequeuniversity.com/rules/axe/2.2/object-alt?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"tabindex": {
"id": "tabindex",
"title": "Some elements have a `[tabindex]` value greater than 0",
"description": "A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. [Learn more](https://dequeuniversity.com/rules/axe/2.2/tabindex?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"td-headers-attr": {
"id": "td-headers-attr",
"title": "Cells in a `<table>` element that use the `[headers]` attribute refers to other cells of that same table.",
"description": "Screen readers have features to make navigating tables easier. Ensuring `<td>` cells using the `[headers]` attribute only refer to other cells in the same table may improve the experience for screen reader users. [Learn more](https://dequeuniversity.com/rules/axe/2.2/td-headers-attr?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"th-has-data-cells": {
"id": "th-has-data-cells",
"title": "`<th>` elements and elements with `[role=\"columnheader\"/\"rowheader\"]` do not have data cells they describe.",
"description": "Screen readers have features to make navigating tables easier. Ensuring table headers always refer to some set of cells may improve the experience for screen reader users. [Learn more](https://dequeuniversity.com/rules/axe/2.2/th-has-data-cells?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"valid-lang": {
"id": "valid-lang",
"title": "`[lang]` attributes do not have a valid value",
"description": "Specifying a valid [BCP 47 language](https://www.w3.org/International/questions/qa-choosing-language-tags#question) on elements helps ensure that text is pronounced correctly by a screen reader. [Learn more](https://dequeuniversity.com/rules/axe/2.2/valid-lang?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"video-caption": {
"id": "video-caption",
"title": "`<video>` elements do not contain a `<track>` element with `[kind=\"captions\"]`.",
"description": "When a video provides a caption it is easier for deaf and hearing impaired users to access its information. [Learn more](https://dequeuniversity.com/rules/axe/2.2/video-caption?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"video-description": {
"id": "video-description",
"title": "`<video>` elements do not contain a `<track>` element with `[kind=\"description\"]`.",
"description": "Audio descriptions provide relevant information for videos that dialogue cannot, such as facial expressions and scenes. [Learn more](https://dequeuniversity.com/rules/axe/2.2/video-description?application=lighthouse).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Accessibility gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"custom-controls-labels": {
"id": "custom-controls-labels",
"title": "Custom controls have associated labels",
"description": "Custom interactive controls have associated labels, provided by aria-label or aria-labelledby. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#try_it_with_a_screen_reader).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"custom-controls-roles": {
"id": "custom-controls-roles",
"title": "Custom controls have ARIA roles",
"description": "Custom interactive controls have appropriate ARIA roles. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#try_it_with_a_screen_reader).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"focus-traps": {
"id": "focus-traps",
"title": "User focus is not accidentally trapped in a region",
"description": "A user can tab into and out of any control or region without accidentally trapping their focus. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#start_with_the_keyboard).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"focusable-controls": {
"id": "focusable-controls",
"title": "Interactive controls are keyboard focusable",
"description": "Custom interactive controls are keyboard focusable and display a focus indicator. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#start_with_the_keyboard).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"heading-levels": {
"id": "heading-levels",
"title": "Headings don't skip levels",
"description": "Headings are used to create an outline for the page and heading levels are not skipped. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#take_advantage_of_headings_and_landmarks).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"interactive-element-affordance": {
"id": "interactive-element-affordance",
"title": "Interactive elements indicate their purpose and state",
"description": "Interactive elements, such as links and buttons, should indicate their state and be distinguishable from non-interactive elements. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#interactive_elements_like_links_and_buttons_should_indicate_their_purpose_and_state).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"logical-tab-order": {
"id": "logical-tab-order",
"title": "The page has a logical tab order",
"description": "Tabbing through the page follows the visual layout. Users cannot focus elements that are offscreen. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#start_with_the_keyboard).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"managed-focus": {
"id": "managed-focus",
"title": "The user's focus is directed to new content added to the page",
"description": "If new content, such as a dialog, is added to the page, the user's focus is directed to it. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#start_with_the_keyboard).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"offscreen-content-hidden": {
"id": "offscreen-content-hidden",
"title": "Offscreen content is hidden from assistive technology",
"description": "Offscreen content is hidden with display: none or aria-hidden=true. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#try_it_with_a_screen_reader).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"use-landmarks": {
"id": "use-landmarks",
"title": "HTML5 landmark elements are used to improve navigation",
"description": "Landmark elements (<main>, <nav>, etc.) are used to improve the keyboard navigation of the page for assistive technology. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#take_advantage_of_headings_and_landmarks).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"visual-order-follows-dom": {
"id": "visual-order-follows-dom",
"title": "Visual order on the page follows DOM order",
"description": "DOM order matches the visual order, improving navigation for assistive technology. [Learn more](https://developers.google.com/web/fundamentals/accessibility/how-to-review#try_it_with_a_screen_reader).",
"score": null,
"scoreDisplayMode": "manual",
"rawValue": false
},
"uses-long-cache-ttl": {
"id": "uses-long-cache-ttl",
"title": "Uses efficient cache policy on static assets",
"description": "A long cache lifetime can speed up repeat visits to your page. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/cache-policy).",
"score": 1,
"scoreDisplayMode": "numeric",
"rawValue": 0,
"displayValue": "0 resources found",
"details": {
"type": "table",
"headings": [],
"items": [],
"summary": {
"wastedBytes": 0
}
}
},
"total-byte-weight": {
"id": "total-byte-weight",
"title": "Avoids enormous network payloads",
"description": "Large network payloads cost users real money and are highly correlated with long load times. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/network-payloads).",
"score": 1,
"scoreDisplayMode": "numeric",
"rawValue": 0,
"displayValue": "Total size was 0 KB",
"details": {
"type": "table",
"headings": [
{
"key": "url",
"itemType": "url",
"text": "URL"
},
{
"key": "totalBytes",
"itemType": "bytes",
"text": "Size (KB)"
}
],
"items": [
{
"url": "http://127.0.0.1:4001/",
"totalBytes": 0,
"totalMs": 0
}
]
}
},
"offscreen-images": {
"id": "offscreen-images",
"title": "Defer offscreen images",
"description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/offscreen-images).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required ImageUsage gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"render-blocking-resources": {
"id": "render-blocking-resources",
"title": "Eliminate render-blocking resources",
"description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/blocking-resources).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required TagsBlockingFirstPaint gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"unminified-css": {
"id": "unminified-css",
"title": "Minify CSS",
"description": "Minifying CSS files can reduce network payload sizes. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/minify-css).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required CSSUsage gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"unminified-javascript": {
"id": "unminified-javascript",
"title": "Minify JavaScript",
"description": "Minifying JavaScript files can reduce payload sizes and script parse time. [Learn more](https://developers.google.com/speed/docs/insights/MinifyResources).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Scripts gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"unused-css-rules": {
"id": "unused-css-rules",
"title": "Defer unused CSS",
"description": "Remove unused rules from stylesheets to reduce unnecessary bytes consumed by network activity. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/unused-css).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required CSSUsage gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"uses-webp-images": {
"id": "uses-webp-images",
"title": "Serve images in next-gen formats",
"description": "Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/webp).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required OptimizedImages gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"uses-optimized-images": {
"id": "uses-optimized-images",
"title": "Efficiently encode images",
"description": "Optimized images load faster and consume less cellular data. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/optimize-images).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required OptimizedImages gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"uses-text-compression": {
"id": "uses-text-compression",
"title": "Enable text compression",
"description": "Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/text-compression).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required ResponseCompression gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"uses-responsive-images": {
"id": "uses-responsive-images",
"title": "Properly size images",
"description": "Serve images that are appropriately-sized to save cellular data and improve load time. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/oversized-images).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required ImageUsage gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"efficient-animated-content": {
"id": "efficient-animated-content",
"title": "Use video formats for animated content",
"description": "Large GIFs are inefficient for delivering animated content. Consider using MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF to save network bytes. [Learn more](https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/replace-animated-gifs-with-video/)",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Something went wrong with recording the trace over your page load. Please run Lighthouse again. (NO_TRACING_STARTED)"
},
"appcache-manifest": {
"id": "appcache-manifest",
"title": "Uses Application Cache",
"description": "Application Cache is deprecated. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/appcache).",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required AppCacheManifest gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"doctype": {
"id": "doctype",
"title": "Page is missing the HTML doctype",
"description": "Specifying a doctype prevents the browser from switching to quirks-mode.Read more on the [MDN Web Docs page](https://developer.mozilla.org/en-US/docs/Glossary/Doctype)",
"score": null,
"scoreDisplayMode": "error",
"rawValue": null,
"errorMessage": "Audit error: Required Doctype gatherer encountered an error: FAILED_DOCUMENT_REQUEST"
},
"dom-size": {
"id": "dom-size",
"title": "Avoid an excessive DOM size",
"description": "Browser engineers recommend pages contain fewer than ~1,500 DOM nodes. The sweet spot is a tree depth < 32 elements and fewer than 60 children/parent element. A large DOM can increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn more](https://developers.google.com/web/tools/lighthouse/audits/dom-size).",
"score": null,