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Lighthouse Desktop

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

Audit breakdown by category with detailed findings.

57

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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/faa.gov/files/styles/faa_by_the_numbers_back/publi...2576.0 s581.5 KiB
www.faa.gov/themes/custom/faa/fonts/Lato/Lato-Semibold.woff21240.0 s180.1 KiB
www.faa.gov/sites/faa.gov/files/2023-02/aviation.jpg3358.0 s185.2 KiB
/sites/faa.gov/files/css/css_p9F6AjmDoFFSmS8e_l9d5QtoKLLn...1806.0 s45.5 KiB
/sites/faa.gov/files/js/js_-IDDgUY54vBFaZ-wnmt6hmsMMT0JH9...3313.0 s39.2 KiB
/sites/faa.gov/files/js/js_t93kQP2c6wtHK4Vh5Hlrk6OAbWYyig...1457.0 s31.6 KiB
/sites/faa.gov/files/styles/faa_home_topics_main/public/2...2447.0 s28.3 KiB
/sites/faa.gov/files/js/js_oQ1_vNDnKkOlwPYNL611aNqxALicHY...1836.0 s27.3 KiB
/sites/faa.gov/files/styles/faa_home_priorities_card/publ...3048.0 s23.9 KiB
/sites/faa.gov/files/styles/faa_home_priorities_card/publ...374.0 s20.2 KiB
/sites/faa.gov/files/js/js_DYXGbe7PgkjgAXERy9PsBpLbSvMEu5...2128.0 s20.6 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
/sites/faa.gov/files/styles/faa_home_priorities_card/publ...1836.0 s18.2 KiB
/sites/faa.gov/files/css/css_NuAOq9yAl6SoIMrLcr1yQmoN5dr1...1409.0 s15.0 KiB
/sites/faa.gov/files/styles/faa_home_topics_sub/public/20...2649.0 s14.2 KiB
/sites/faa.gov/files/css/css_Cma74XMrE9FlgSoDro7nayfIjSWN...2598.0 s14.0 KiB
www.faa.gov/themes/custom/faa/images/logo-faa.svg1034.0 s12.2 KiB
/sites/faa.gov/files/styles/faa_home_news_image/public/20...1331.0 s11.8 KiB
dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOT0.0 ms9.4 KiB
www.faa.gov/akam/13/7dd5141d21600.0 s9.4 KiB
/sites/faa.gov/files/js/js_1DzfAiRK6xExZPPQyR3k7bfQREeAlK...2721.0 s5.6 KiB
dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js0.0 ms4.5 KiB
/sites/faa.gov/files/js/js_CvdUhVGZLyQvPV6aJ73oK2u18NkDsM...3235.0 s4.7 KiB
/sites/faa.gov/files/js/js_hApV7douVzMQ-1gpxBNyIR_SQYvukk...1806.0 s2.4 KiB
www.faa.gov/modules/contrib/collapsiblock/theme/dist/collapsiblock.js?tdk0161914.0 s1.7 KiB
www.faa.gov/themes/custom/dot_cms/js/custom.js?v=10.6.71690.0 s1.4 KiB
/sites/faa.gov/files/js/js_I6maBgOLeB-WpTpMaqZ3pnbo0qcPZZ...2576.0 s1.2 KiB
www.faa.gov/themes/custom/faa/images/search-gold.svg1368.0 s914 B
www.faa.gov/themes/custom/dot_cms/js/leftnav.js?v=10.6.71689.0 s841 B
www.faa.gov/themes/custom/faa/js/custom.js?v=10.6.72052.0 s735 B
www.faa.gov/themes/custom/dot_cms/images/assets/icon-dot-gov.svg2566.0 s674 B
www.faa.gov/themes/custom/dot_cms/images/assets/icon-https.svg988.0 s621 B
www.faa.gov/core/misc/throbber-inactive.png1420.0 s629 B
www.faa.gov/themes/custom/dot_cms/images/assets/us_flag_small.svg901.0 s519 B
www.faa.gov/modules/contrib/purge_ajax_processor/js/trigger_purge.js?tdk0162112.0 s544 B
www.faa.gov/themes/custom/faa/js/global.js?v=10.6.7913.0 s445 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.

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:0.546491] map[node:map[boundingRect:map[bottom:563 height:436 left:126 right:1334 top:127 width:1208] lhId:page-1-DIV nodeLabel:Main navigation (Desktop) Aircraft Air Traffic Airports Pilots & Airmen Data & … path:1,HTML,1,BODY,4,DIV,0,DIV,0,DIV,3,HEADER,0,DIV,0,NAV,0,DIV,1,DIV,0,DIV,1,DIV selector:div.row > div.wrapper__navigation > div#CollapsingNavbar > div.row snippet:<div class="row no-gutters"> type:node] score:0.463578] map[node:map[boundingRect:map[bottom:563 height:436 left:126 right:1334 top:127 width:1208] lhId:page-1-DIV nodeLabel:Main navigation (Desktop) Aircraft Air Traffic Airports Pilots & Airmen Data & … path:1,HTML,1,BODY,4,DIV,0,DIV,0,DIV,3,HEADER,0,DIV,0,NAV,0,DIV,1,DIV,0,DIV,1,DIV selector:div.row > div.wrapper__navigation > div#CollapsingNavbar > div.row snippet:<div class="row no-gutters"> type:node] score:0.082385 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:21 height:11 left:15 right:31 top:10 width:16] lhId:page-6-IMG nodeLabel:U.S. flag path:1,HTML,1,BODY,4,DIV,0,DIV,0,DIV,0,SECTION,1,DIV,0,DIV,0,DIV,0,HEADER,0,DIV,0,DIV,0,DIV,0,IMG selector:div.collapsed > div.usa-banner-guidance-gov > div.usa-media_block-icon > img.usa-banner-flag snippet:<img class="usa-banner-flag" src="/themes/custom/dot_cms/images/assets/us_flag_small.svg" alt="U.S. flag"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:127 height:60 left:626 right:1334 top:67 width:708] lhId:page-3-DIV nodeLabel:Secondary navigation About Jobs News Enter Search Term(s): path:1,HTML,1,BODY,4,DIV,0,DIV,0,DIV,3,HEADER,0,DIV,0,NAV,0,DIV,1,DIV,0,DIV,0,DIV selector:div.row > div.wrapper__navigation > div#CollapsingNavbar > div.row snippet:<div class="row no-gutters"> type:node] score:0.000528 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:21 height:11 left:15 right:31 top:10 width:16] lhId:page-6-IMG nodeLabel:U.S. flag path:1,HTML,1,BODY,4,DIV,0,DIV,0,DIV,0,SECTION,1,DIV,0,DIV,0,DIV,0,HEADER,0,DIV,0,DIV,0,DIV,0,IMG selector:div.collapsed > div.usa-banner-guidance-gov > div.usa-media_block-icon > img.usa-banner-flag snippet:<img class="usa-banner-flag" src="/themes/custom/dot_cms/images/assets/us_flag_small.svg" alt="U.S. flag"> type:node]]] type:subitems]]]

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
use.fontawesome.com/releases/v6.5.1/webfonts/fa-solid-900.woff260 ms
use.fontawesome.com/releases/v6.5.1/webfonts/fa-regular-400.woff255 ms
use.fontawesome.com/releases/v6.5.1/webfonts/fa-brands-400.woff255 ms
/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu...40 ms
/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu...30 ms
www.faa.gov/themes/custom/faa/fonts/Lato/Lato-Semibold.woff225 ms
/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj...20 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-SECTION
nodeLabel: Providing the Safest, Most Efficient Aerospace System in the World.
path: 1,HTML,1,BODY,4,DIV,0,DIV,0,DIV,4,MAIN,1,DIV,0,DIV,0,DIV,0,SECTION
selector: div.hero-space > div.view-content > div > section.jumbotron
snippet: <section data-history-node-id="71" class="jumbotron jumbotron-fluid hero home-hero node node--type-homepage-image no…" style="background-image: url(/sites/faa.gov/files/2023-02/aviation.jpg)">

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
use.fontawesome.com/releases/v6.5.1/css/all.css24.4 KiB319 ms
fonts.googleapis.com/css?family=Source+Sans+Pro:400,400i,600,600i,700,700i1.0 KiB61 ms
/css?family=Lato:100,300,400,400i,600,600i,700,700i&displ...1016 B271 ms
/css2?family=Lato:ital,wght@0,300;0,400;0,700;1,300;1,400...619 B
/css2?family=Source+Sans+Pro:ital,wght@0,300;0,400;0,600;...1.2 KiB
fonts.googleapis.com/css?family=Source+Sans+Pro:400,600,700864 B
/css2?family=Raleway:ital,wght@0,300;0,400;0,500;0,600;0,...1005 B
/sites/faa.gov/files/css/css_p9F6AjmDoFFSmS8e_l9d5QtoKLLn...45.5 KiB121 ms
/sites/faa.gov/files/js/js_t93kQP2c6wtHK4Vh5Hlrk6OAbWYyig...31.6 KiB81 ms
/sites/faa.gov/files/css/css_Cma74XMrE9FlgSoDro7nayfIjSWN...14.0 KiB
/sites/faa.gov/files/css/css_NuAOq9yAl6SoIMrLcr1yQmoN5dr1...15.0 KiB

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
FAA By the Numbers 19,482 U.S. Airports 44,360 Average Daily Flights Handled by… div.container > div.row > div.col-12 > section.numbers
/sites/faa.gov/files/styles/faa_by_the_numbers_back/publi...580.5 KiB513.7 KiB
DCA div.card > div.card-horizontal > div.col-3 > img.image-style-faa-home-topics-sub
/sites/faa.gov/files/styles/faa_home_topics_sub/public/20...14.0 KiB6.5 KiB
Travelers at airport div.card > div.card-horizontal > div.col-3 > img.image-style-faa-home-topics-sub
/sites/faa.gov/files/styles/faa_home_topics_sub/public/20...12.5 KiB4.9 KiB

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 991 ms
URLTime Spent
faa.gov/770 ms
www.faa.gov/221 ms
www.faa.gov/0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
Main navigation (Desktop) Aircraft Air Traffic Airports Pilots & Airmen Data & … div.row > div.wrapper__navigation > div#CollapsingNavbar > div.row
0.464
Main navigation (Desktop) Aircraft Air Traffic Airports Pilots & Airmen Data & … div.row > div.wrapper__navigation > div#CollapsingNavbar > div.row
0.082
Secondary navigation About Jobs News Enter Search Term(s): div.row > div.wrapper__navigation > div#CollapsingNavbar > div.row
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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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: 90 ms 89.1 KiB
URLTransfer SizeEst Savings
/sites/faa.gov/files/css/css_p9F6AjmDoFFSmS8e_l9d5QtoKLLn...45.2 KiB42.3 KiB
use.fontawesome.com/releases/v6.5.1/css/all.css23.9 KiB23.6 KiB
/sites/faa.gov/files/css/css_NuAOq9yAl6SoIMrLcr1yQmoN5dr1...14.7 KiB12.8 KiB
/sites/faa.gov/files/css/css_Cma74XMrE9FlgSoDro7nayfIjSWN...13.7 KiB10.5 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: 40 ms 606.4 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147.1 KiB106.0 KiB
www.googletagmanager.com/gtag/js?id=G-0623JYSC1Q&cx=c&gtm=4e64h1155.5 KiB67.3 KiB
www.googletagmanager.com/gtag/js?id=G-46CT7JC8WZ&cx=c&gtm=4e64h1157.0 KiB66.6 KiB
www.googletagmanager.com/gtag/js?id=G-XLYJSDG13C&cx=c&gtm=4e64h1153.1 KiB65.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-K29M3L2125.3 KiB63.8 KiB
www.googletagmanager.com/gtag/js?id=G-NQ5ZN114SB&cx=c&gtm=4e64h1155.4 KiB63.0 KiB
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1147.1 KiB62.4 KiB
www.googletagmanager.com/gtag/js?id=UA-18660041-1116.6 KiB61.5 KiB
/sites/faa.gov/files/js/js_-IDDgUY54vBFaZ-wnmt6hmsMMT0JH9...38.9 KiB28.8 KiB
/sites/faa.gov/files/js/js_oQ1_vNDnKkOlwPYNL611aNqxALicHY...27.0 KiB21.7 KiB

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.Not actionable

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/sites/faa.gov/files/styles/faa_by_the_numbers_back/publi...581.5 KiB
www.faa.gov/sites/faa.gov/files/2023-02/aviation.jpg185.2 KiB
www.faa.gov/themes/custom/faa/fonts/Lato/Lato-Semibold.woff2180.1 KiB
www.googletagmanager.com/gtag/js?id=G-46CT7JC8WZ&cx=c&gtm=4e64h1157.0 KiB
www.googletagmanager.com/gtag/js?id=G-0623JYSC1Q&cx=c&gtm=4e64h1155.5 KiB
www.googletagmanager.com/gtag/js?id=G-NQ5ZN114SB&cx=c&gtm=4e64h1155.5 KiB
use.fontawesome.com/releases/v6.5.1/webfonts/fa-solid-900.woff2153.3 KiB
www.googletagmanager.com/gtag/js?id=G-XLYJSDG13C&cx=c&gtm=4e64h1153.2 KiB
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1147.1 KiB
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Home div.row > div.col-10 > a.navbar-brand > img.img-fluid
www.faa.gov/themes/custom/faa/images/logo-faa.svg
Controller at night div.card > div.card__featured_img > div.featured__gradient > img.image-style-faa-home-topics-main
/sites/faa.gov/files/styles/faa_home_topics_main/public/2...
Chicago O'Hare Airport div.col-12 > div.views-field > span.field-content > img.image-style-faa-home-news-image
/sites/faa.gov/files/styles/faa_home_news_image/public/20...
Travelers at airport div.card > div.card-horizontal > div.col-3 > img.image-style-faa-home-topics-sub
/sites/faa.gov/files/styles/faa_home_topics_sub/public/20...
DCA div.card > div.card-horizontal > div.col-3 > img.image-style-faa-home-topics-sub
/sites/faa.gov/files/styles/faa_home_topics_sub/public/20...
U.S. flag div.collapsed > div.usa-banner-guidance-gov > div.usa-media_block-icon > img.usa-banner-flag
www.faa.gov/themes/custom/dot_cms/images/assets/us_flag_small.svg

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

●Max Potential First Input Delay 70 ms
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 29 user timings
●JavaScript execution time 0.3 s
●Minimizes main-thread work 0.9 s
●Avoid long main-thread tasks 6 long tasks found
●Network Requests
●Network Round Trip Times 180 ms
●Server Backend Latencies 40 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 10 ms
○INP breakdown
○Avoid non-composited animations
90

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
form > div.row > div.home__form > input.btn form > div.row > div.home__form > input.btn
div.quick_search-delays > form#faa-airport-status-lookup-form > div.col-4 > input#airport-code-status-search-submit div.quick_search-delays > form#faa-airport-status-lookup-form > div.col-4 > input#airport-code-status-search-submit

These are opportunities to improve the legibility of your content.

Navigation

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 about the `tabindex` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
form > div.row > div.col-12 > span.tool form > div.row > div.col-12 > span.tool

These are opportunities to improve keyboard navigation in your application.

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
div.search__wrapper > form#search_form > fieldset.form-type-search > input.button div.search__wrapper > form#search_form > fieldset.form-type-search > input.button

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
●`[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.
●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.
●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
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●ARIA IDs are unique
○`[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
○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
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○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.
○`<td>` elements in a large `<table>` have one or more table headers.
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Best Practices

Trust and Safety

All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding mixed content, where some resources are loaded over HTTP despite the initial request being served over HTTPS. 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 about HTTPS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Insecure URLRequest Resolution
www.faa.gov/Allowed
●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
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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.

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

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