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· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

87

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
/sites/default/files/styles/large/public/2023-10/Capitol ...56859.0 s404.2 KiB
/sites/default/files/styles/large/public/2023-01/Floor Pr...38405.0 s44.6 KiB
/sites/default/files/styles/homepage_carousel/public/uplo...4849.0 s28.2 KiB
/sites/default/files/styles/large/public/2024-10/constitu...43662.0 s32.4 KiB
www.house.gov/core/assets/vendor/jquery/jquery.min.js?v=4.0.036743.0 s27.6 KiB
/sites/default/files/styles/homepage_carousel/public/uplo...76038.0 s28.7 KiB
/sites/default/files/styles/homepage_carousel/public/uplo...41375.0 s23.5 KiB
/sites/default/files/styles/homepage_carousel/public/uplo...78727.0 s23.8 KiB
/sites/default/files/styles/homepage_carousel/public/uplo...52505.0 s16.8 KiB
/sites/default/files/styles/homepage_carousel/public/uplo...51270.0 s16.4 KiB
/sites/default/files/styles/large/public/uploads/images-s...71651.0 s16.5 KiB
/sites/default/files/css/css_vKwGOib_wDyOY1O6NucuWZVuQj0p...17703.0 s4.0 KiB
www.house.gov/sites/default/themes/housegov/logo.svg71651.0 s1.6 KiB

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.192331] map[node:map[boundingRect:map[bottom:1235 height:556 left:195 right:1155 top:679 width:960] lhId:page-17-DIV nodeLabel:House Overview Representatives Leadership Committees Officers and Organizations… path:1,HTML,1,BODY,4,DIV,0,DIV,1,DIV,0,SECTION,1,DIV,1,DIV,1,DIV selector:section.col-xs-16 > div.region > div.home-layout > div.row snippet:<div class="row"> type:node] score:0.192331]]

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:80.018 source:map[column:156 line:16 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:27.586 source:map[column:86369 line:63 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]] map[reflowTime:6.436 source:map[column:50118 line:63 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]] map[reflowTime:1.232 source:map[column:50843 line:63 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]] map[reflowTime:0.501 source:map[column:50901 line:63 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]] map[reflowTime:0.439 source:map[column:50965 line:63 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]] map[reflowTime:37.842 source:map[column:80171 line:63 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]] map[reflowTime:0.673 source:map[column:51910 line:63 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]] map[reflowTime:1.132 source:map[column:50140 line:63 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]] map[reflowTime:4.177 source:map[column:84729 line:63 type:source-location url:https://www.house.gov/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2TocOq1F97fQZRE.js?scope=footer&delta=1&language=en&theme=housegov&include=eJxtjlESgzAIRC8k5kgORoyZJiED2NbbN-1o04_-LW93Ac9CznOuXKiYjhvvSoHvAB8FsYCSauQyND_aMQmtk-E8rSwZzUgces-ytEhnAz0txXJzi-wV03iOw7XezcymJlihdanzkHjGBGpHy4fON85UMRC00_qLz3c9ylumP9ZV7RY_0rfwAkQKZbc urlProvider:network]]]

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Interior of the U.S. Capitol dome. div.owl-stage > div.owl-item > div.carousel-item > img
/sites/default/files/styles/large/public/2023-10/Capitol ...403.7 KiB375.6 KiB
Image of House Chamber div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...28.2 KiB21.5 KiB
A lighthouse by the ocean div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...27.6 KiB21.0 KiB
Home div.row > div.col-xs-16 > div.region > a.logo
www.house.gov/sites/default/themes/housegov/images/houseLogoScreenIn.png28.8 KiB19.5 KiB
Emancipation Hall in the Capitol Visitor Center div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...23.9 KiB17.8 KiB
Orchid at the United States Botanic Garden div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...23.3 KiB17.3 KiB
Logo of Kids in the House div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...23.0 KiB17.1 KiB
Black and white image of a group of Hispanic American Congressmen div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...22.2 KiB16.5 KiB
section#committee-schedules > div.carousel-controls > a.right > span.icon-next section#committee-schedules > div.carousel-controls > a.right > span.icon-next
www.house.gov/sites/default/themes/housegov/images/arrows-sprite.png16.9 KiB16.2 KiB
House Floor Proceedings div.owl-stage > div.owl-item > div.carousel-item > img
/sites/default/files/styles/large/public/2023-01/Floor Pr...44.1 KiB15.9 KiB
Black and white image of a Congresswoman standing in front of U.S. flag div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...20.1 KiB14.9 KiB
Congressman Joseph Hayne Rainey div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...19.6 KiB14.6 KiB
logo for Wounded Warrior Program div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...16.3 KiB12.1 KiB
Congressional App Challenge div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...15.9 KiB11.8 KiB
Artistic rendering of a former Congressman div.carousel-caption--owl > a > div.carousel-image > img
/sites/default/files/styles/homepage_carousel/public/uplo...10.7 KiB7.9 KiB
Watch Most Recent House Floor Activity div#carousel-events > div.view-header > div#homepage-committee-schedules-houselive > a.ext
www.house.gov/sites/default/themes/housegov/images/bgSprite.png14.8 KiB7.4 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-16-IMG
nodeLabel: What to Know Before Visiting the House
path: 1,HTML,1,BODY,4,DIV,0,DIV,1,DIV,0,SECTION,1,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG
selector: div.owl-stage > div.owl-item > div.carousel-item > img
snippet: <img loading="lazy" src="/sites/default/files/styles/large/public/2024-10/constituent_pic_cap_rotun…" width="480" height="360" alt="What to Know Before Visiting the House">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
www.house.gov/http/1.1
www.house.gov/ruxitagentjs_ICA7NQVfqrux_10331260218130851.jshttp/1.1
/sites/default/files/css/css_vKwGOib_wDyOY1O6NucuWZVuQj0p...http/1.1
/sites/default/files/css/css_z0wHwbPsLix_f19iiTkAgbSGcT7P...http/1.1
www.house.gov/sites/default/themes/housegov/logo.svghttp/1.1
www.house.gov/sites/default/themes/housegov/images/map-home-states.gifhttp/1.1
www.house.gov/core/assets/vendor/jquery/jquery.min.js?v=4.0.0http/1.1
/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2T...http/1.1
www.house.gov/sites/default/themes/housegov/images/bgHTML.jpghttp/1.1
www.house.gov/sites/default/themes/housegov/images/bgBody_lg.jpghttp/1.1
www.house.gov/sites/default/themes/housegov/images/houseLogoScreen.gifhttp/1.1
www.house.gov/sites/default/themes/housegov/images/bgFind.jpghttp/1.1
www.house.gov/sites/default/themes/housegov/images/arrows-sprite.pnghttp/1.1
www.house.gov/sites/default/themes/housegov/images/bgSprite.pnghttp/1.1
/sites/default/files/styles/large/public/2024-10/constitu...http/1.1
/sites/default/files/styles/large/public/2023-10/Capitol ...http/1.1
/sites/default/files/styles/large/public/uploads/images-s...http/1.1
/sites/default/files/styles/large/public/2023-01/Floor Pr...http/1.1
www.house.gov/in-session.phphttp/1.1
www.house.gov/sites/default/themes/housegov/images/houseLogoScreenIn.pnghttp/1.1
/sites/default/themes/housegov/components/house-in-sessio...http/1.1
www.house.gov/sites/default/themes/housegov/images/bgTabsFeatureActive.gifhttp/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
/sites/default/files/styles/homepage_carousel/public/uplo...http/1.1
www.house.gov/sites/default/themes/housegov/favicon.icohttp/1.1
/rb_84936baa-290a-41c1-8aba-c50589e8f708?type=js3&sn=v_4_...http/1.1
/rb_84936baa-290a-41c1-8aba-c50589e8f708?type=js3&flavor=...http/1.1
/rb_84936baa-290a-41c1-8aba-c50589e8f708?type=js3&flavor=...http/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates
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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
www.house.gov/ruxitagentjs_ICA7NQVfqrux_10331260218130851.js106.8 KiB282 ms
/sites/default/files/css/css_z0wHwbPsLix_f19iiTkAgbSGcT7P...27.9 KiB202 ms
/sites/default/files/css/css_vKwGOib_wDyOY1O6NucuWZVuQj0p...4.0 KiB82 ms

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

Diagnostics

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 40 ms 21.4 KiB
URLTransfer SizeEst Savings
/sites/default/files/css/css_z0wHwbPsLix_f19iiTkAgbSGcT7P...27.1 KiB21.4 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 80 ms 226.5 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtm.js?id=GTM-TQX94K2166.3 KiB72.7 KiB
www.googletagmanager.com/gtag/js?id=G-65K8PR1QER&cx=c&gtm=4e64h1144.8 KiB63.1 KiB
www.house.gov/ruxitagentjs_ICA7NQVfqrux_10331260218130851.js106.2 KiB49.9 KiB
/sites/default/files/js/js_yLfC_csMovnaXacCikH96zR8H2WU2T...84.5 KiB40.9 KiB

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

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
House Overview Representatives Leadership Committees Officers and Organizations… section.col-xs-16 > div.region > div.home-layout > div.row
0.192
●Max Potential First Input Delay 100 ms
●Time to Interactive 1.9 s
●Document request latency
●Optimize DOM size
●Font display
●LCP breakdown
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●Avoids enormous network payloads Total size was 1,546 KiB
●User Timing marks and measures 5 user timings
●JavaScript execution time 0.6 s
●Minimizes main-thread work 1.1 s
●Avoid long main-thread tasks 3 long tasks found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 0 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 10 ms
○INP breakdown
○Avoid non-composited animations
97

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Accessibility section#block-footer-menu > ul.menu > li.expanded > a
Contact Webmaster section#block-footer-menu > ul.menu > li.expanded > a
Feature Stories section#block-footer-menu > ul.menu > li.expanded > a
Privacy Policy section#block-footer-menu > ul.menu > li.expanded > a
Site Map section#block-footer-menu > ul.menu > li.expanded > a
Site Tools section#block-footer-menu > ul.menu > li.expanded > a
Terms of Use section#block-footer-menu > ul.menu > li.expanded > a
Watch live.house.gov section#block-footer-menu > ul.menu > li.expanded > a

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●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
●`[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
●Input buttons have discernible text.
●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.
●Select elements have associated label elements.
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●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.
●Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`[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 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 type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○`<td>` elements in a large `<table>` have one or more table headers.
100

Best Practices

●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
92

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

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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