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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

40

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
www.ada.gov/assets/images/hero-flag-mobile.jpg60.0 s340.5 KiB
www.ada.gov/assets/images/landing/parking.jpg60.0 s112.9 KiB
www.ada.gov/assets/images/landing/service_animals.jpg60.0 s98.4 KiB
www.ada.gov/assets/css/styles.css60.0 s82.4 KiB
www.ada.gov/assets/images/doj-logo.png60.0 s71.5 KiB
www.ada.gov/assets/images/landing/intro_ada.jpg60.0 s32.6 KiB
www.ada.gov/assets/fonts/public-sans/PublicSans-Regular.woff260.0 s32.4 KiB
www.ada.gov/assets/fonts/public-sans/PublicSans-Bold.woff260.0 s32.2 KiB
www.ada.gov/assets/images/landing/effective_communication.jpg60.0 s28.5 KiB
www.ada.gov/assets/js/vendor/uswds/uswds.min.js60.0 s24.4 KiB
www.ada.gov/assets/fonts/merriweather/Latin-Merriweather-Bold.woff260.0 s21.4 KiB
www.ada.gov/assets/js/dist/main-compiled.js60.0 s10.0 KiB
dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOJ0.0 ms9.4 KiB
dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js0.0 ms4.5 KiB
www.ada.gov/assets/images/ic_phone-circle.svg60.0 s2.1 KiB
www.ada.gov/assets/images/phone.svg60.0 s1.8 KiB
www.ada.gov/assets/js/dist/accordion-compiled.js60.0 s1.4 KiB
www.ada.gov/assets/images/landing/laws_regs_standards_gold.png60.0 s1.3 KiB
www.ada.gov/assets/images/landing/featured_topics_grey_bg.png60.0 s1.3 KiB
www.ada.gov/assets/images/landing/laws_regs_standards_grey_bg.png60.0 s1.3 KiB
www.ada.gov/assets/images/mail.svg60.0 s1.3 KiB
www.ada.gov/assets/images/landing/guidance_resource_materials_gold.png60.0 s1.2 KiB
www.ada.gov/assets/images/landing/guidance_resource_materials_grey_bg.png60.0 s1.2 KiB
www.ada.gov/assets/images/uswds/us_flag_small.png60.0 s1.1 KiB
www.ada.gov/assets/images/uswds/icon-dot-gov.svg60.0 s1.0 KiB
www.ada.gov/assets/images/uswds/icon-https.svg60.0 s986 B
www.ada.gov/assets/images/landing/featured_topics_gold.svg60.0 s957 B
www.ada.gov/assets/js/vendor/uswds/uswds-init.min.js60.0 s849 B
www.ada.gov/assets/images/uswds/usa-icons/close.svg60.0 s752 B
www.ada.gov/assets/images/uswds/usa-icons/expand_more.svg60.0 s743 B
www.ada.gov/assets/images/uswds/usa-icons/warning.svg60.0 s738 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:0.765377] map[node:map[boundingRect:map[bottom:7698 height:7518 left:0 right:412 top:179 width:412] lhId:page-6-MAIN nodeLabel:Changes to the ADA Title II Rule on Web Content and Mobile App Accessibility T… path:1,HTML,1,BODY,3,MAIN selector:body > main#main-content snippet:<main id="main-content" class="margin-top-0 margin-bottom-0"> type:node] score:0.295957 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:97 height:45 left:48 right:93 top:52 width:45] lhId:page-13-IMG nodeLabel:The United States Department of Justice path:1,HTML,1,BODY,2,HEADER,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,A,0,DIV,0,IMG selector:div.grid-container > a.usa-footer__logo > div.flex-none > img.margin-right-1 snippet:<img src="/assets/images/doj-logo.png" alt="The United States Department of Justice" class="margin-right-1"> type:node]] map[cause:Web font extra:map[type:url value:https://www.ada.gov/assets/fonts/public-sans/PublicSans-Regular.woff2]] map[cause:Web font extra:map[type:url value:https://www.ada.gov/assets/fonts/public-sans/PublicSans-Bold.woff2]] map[cause:Web font extra:map[type:url value:https://www.ada.gov/assets/fonts/merriweather/Latin-Merriweather-Bold.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:7698 height:7518 left:0 right:412 top:179 width:412] lhId:page-6-MAIN nodeLabel:Changes to the ADA Title II Rule on Web Content and Mobile App Accessibility T… path:1,HTML,1,BODY,3,MAIN selector:body > main#main-content snippet:<main id="main-content" class="margin-top-0 margin-bottom-0"> type:node] score:0.295957 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:97 height:45 left:48 right:93 top:52 width:45] lhId:page-13-IMG nodeLabel:The United States Department of Justice path:1,HTML,1,BODY,2,HEADER,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,A,0,DIV,0,IMG selector:div.grid-container > a.usa-footer__logo > div.flex-none > img.margin-right-1 snippet:<img src="/assets/images/doj-logo.png" alt="The United States Department of Justice" class="margin-right-1"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:979 height:373 left:0 right:412 top:606 width:412] lhId:page-4-DIV nodeLabel:The Americans with Disabilities Act (ADA) protects people with disabilities fro… path:1,HTML,1,BODY,3,MAIN,1,DIV,2,DIV selector:body > main#main-content > div.crt-landing--section > div.grid-container snippet:<div class="grid-container"> type:node] score:0.173144 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:602 height:264 left:0 right:412 top:338 width:412] lhId:page-0-IMG nodeLabel:'American flag flying in front of a government building' path:1,HTML,1,BODY,3,MAIN,1,DIV,1,IMG selector:body > main#main-content > div.crt-landing--section > img.height-full snippet:<img src="/assets/images/hero-flag-mobile.jpg" alt="'American flag flying in front of a government building'" class="height-full width-full desktop:display-none"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:823 height:41 left:223 right:392 top:782 width:169] lhId:page-12-A nodeLabel:Give Us Feedback path:1,HTML,1,BODY,5,A selector:body > a#feedback-button snippet:<a id="feedback-button" class="fixed-tab-button usa-button crt-button--large" href="#touchpoints-modal" aria-controls="touchpoints-modal" data-open-modal="" role="button"> type:node] score:0.000319]]

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.

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
'American flag flying in front of a government building' body > main#main-content > div.crt-landing--section > img.height-full
www.ada.gov/assets/images/hero-flag-mobile.jpg339.5 KiB295.2 KiB
The United States Department of Justice div.grid-container > div.usa-footer__logo > div.grid-col-auto > img
www.ada.gov/assets/images/doj-logo.png70.8 KiB69.8 KiB
A man in a wheelchair approaching a vehicle with his hand on the door handle div.usa-card__container > div.usa-card__media > div.usa-card__img > img
www.ada.gov/assets/images/landing/parking.jpg112.3 KiB67.1 KiB
A service animal helps a blind person down the stairs div.usa-card__container > div.usa-card__media > div.usa-card__img > img
www.ada.gov/assets/images/landing/service_animals.jpg97.7 KiB50.7 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-0-IMG
nodeLabel: 'American flag flying in front of a government building'
path: 1,HTML,1,BODY,3,MAIN,1,DIV,1,IMG
selector: body > main#main-content > div.crt-landing--section > img.height-full
snippet: <img src="/assets/images/hero-flag-mobile.jpg" alt="'American flag flying in front of a government building'" class="height-full width-full desktop:display-none">

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

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.

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: 877 ms
URLTime Spent
ada.gov/877 ms
www.ada.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
Changes to the ADA Title II Rule on Web Content and Mobile App Accessibility T… body > main#main-content
0.296
Changes to the ADA Title II Rule on Web Content and Mobile App Accessibility T… body > main#main-content
0.296
The Americans with Disabilities Act (ADA) protects people with disabilities fro… body > main#main-content > div.crt-landing--section > div.grid-container
0.173
Give Us Feedback body > a#feedback-button
0.000

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

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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: 300 ms 128.8 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: 1.2 s 232.0 KiB

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 5.6 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 9.6 KiB
URLTransfer SizeEst Savings
touchpoints.app.cloud.gov/touchpoints/060c43e3.js77.8 KiB9.6 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
'American flag flying in front of a government building' body > main#main-content > div.crt-landing--section > img.height-full
www.ada.gov/assets/images/hero-flag-mobile.jpg
The United States Department of Justice div.grid-container > a.usa-footer__logo > div.flex-none > img.margin-right-1
www.ada.gov/assets/images/doj-logo.png
The United States Department of Justice div.grid-container > div.usa-footer__logo > div.grid-col-auto > img
www.ada.gov/assets/images/doj-logo.png
U.S. Department of Justice logo header > h1#fba-form-title-060c43e3 > div.margin-bottom-2 > img.form-header-logo-square
/uploads/form/logo/3748/logo_square_logo_square_doj-logo-...
U.S.Flag header.usa-banner__header > div.usa-banner__inner > div.grid-col-auto > img.usa-banner__header-flag
www.ada.gov/assets/images/uswds/us_flag_small.png
U.S. flag footer.usa-banner__header > div.usa-banner__inner > div.grid-col-auto > img.usa-banner__header-flag
touchpoints.app.cloud.gov/img/us_flag_small.png
div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img
www.ada.gov/assets/images/landing/featured_topics_gold.svg
div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img
www.ada.gov/assets/images/landing/guidance_resource_materials_gold.png
div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img
www.ada.gov/assets/images/landing/featured_topics_grey_bg.png
div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img
www.ada.gov/assets/images/landing/guidance_resource_materials_grey_bg.png
div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img
www.ada.gov/assets/images/landing/laws_regs_standards_grey_bg.png
div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img div.tablet:grid-col-4 > div.crt-landing--reporting_column > div.h4 > img
www.ada.gov/assets/images/landing/laws_regs_standards_gold.png
mail div#contact-crt > div.usa-footer__section > div.usa-footer__icon > img.icon
www.ada.gov/assets/images/mail.svg
phone div#contact-crt > div.usa-footer__section > div.usa-footer__icon > img.icon
www.ada.gov/assets/images/phone.svg

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

●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Avoids enormous network payloads Total size was 1,504 KiB
●User Timing marks and measures 14 user timings
●JavaScript execution time 0.7 s
●Minimizes main-thread work 1.5 s
●Avoid long main-thread tasks 7 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 180 ms
●Server Backend Latencies 450 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 0 ms
○INP breakdown
○Avoid non-composited animations
100

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.

○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
●`[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
●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 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
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Form elements have associated labels
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label 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.
○`<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.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
96

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLDisplayed sizeActual sizeExpected size
U.S. Department of Justice logo header > h1#fba-form-title-060c43e3 > div.margin-bottom-2 > img.form-header-logo-square
/uploads/form/logo/3748/logo_square_logo_square_doj-logo-...80 x 8080 x 80120 x 120
●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
●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
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
○Detected JavaScript libraries
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

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

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
●Document has a meta description
●Page has successful HTTP status code
●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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