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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.

43

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
home.treasury.gov/themes/custom/hamilton/videos/freedom250-fireworks-overlay.mp430.0 s641.6 KiB
home.treasury.gov/themes/custom/hamilton/sass/components/tile-link/box-blue.png1559.0 s117.3 KiB
home.treasury.gov/themes/custom/hamilton/sass/components/tile-link/box-gray.png1567.0 s68.6 KiB
/sites/default/files/js/js_h9tBUrkLUDgMVdF74hwOrsFhbGJ6KH...33207.0 s97.1 KiB
/sites/default/files/css/css_uCi-fy9m2pDKqUD32quD8CZ864_0...33345.0 s90.4 KiB
home.treasury.gov/themes/custom/hamilton/images/freedom-250-logo-color.png1272.0 s44.3 KiB
/sites/default/files/js/js_hoOrcluwgkAeT6ZqgVtVXDUa0Q6Dpi...35708.0 s38.8 KiB
home.treasury.gov/themes/custom/hamilton/sass/components/footer/seal.png849.0 s21.7 KiB
/libraries/uswds/dist/fonts/source-sans-pro/sourcesanspro...290.0 s20.1 KiB
/sites/default/files/js/js_EF_HuS9dv1flDPUbFVgB5fqP820q55...33208.0 s32.2 KiB
home.treasury.gov/themes/custom/hamilton/logo.old.svg1580.0 s19.9 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
home.treasury.gov/themes/custom/hamilton/logo.svg1494.0 s15.0 KiB
/Universal-Federated-Analytics-Min.js?agency=TRE&pua=UA-1...0.0 ms9.5 KiB
s.go-mpulse.net/boomerang/M33KD-YMV8Y-625W4-V96WF-R28AJ604800.0 s56.8 KiB
home.treasury.gov/akam/13/77aad58821600.0 s8.6 KiB
/sites/default/files/js/js_IMwaQVcYmh93X5LNpBRTC95jDT5vWk...22251.0 s8.2 KiB
/sites/default/files/css/css_00cNwv72zd11kA6rKNtHOzIkos2T...33703.0 s8.7 KiB
dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js0.0 ms4.6 KiB
/sites/default/files/css/css_zbin96D660k4JaDc3rCqDzjG7aza...31862.0 s2.2 KiB
home.treasury.gov/libraries/uswds/src/img/icon-dot-gov.svg1358.0 s889 B
home.treasury.gov/libraries/uswds/src/img/us_flag_small.png455.0 s617 B
/themes/custom/hamilton/sass/components/tile-link/arrow-r...1567.0 s562 B
/themes/custom/hamilton/sass/components/tile-link/arrow-s...556.0 s497 B
home.treasury.gov/libraries/uswds/src/img/icon-https.svg1521.0 s419 B
home.treasury.gov/libraries/uswds/dist/img/usa-icons/expand_more.svg999.0 s195 B
home.treasury.gov/themes/custom/hamilton/videos/freedom250-fireworks-overlay.mp430.0 s0 B
home.treasury.gov/themes/custom/hamilton/videos/freedom250-fireworks-overlay.mp430.0 s0 B

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

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:0.16486800000000001] map[node:map[boundingRect:map[bottom:2779 height:2332 left:0 right:412 top:447 width:412] lhId:page-9-DIV nodeLabel:Featured Stories January 28, 2025 Scott Bessent sworn in as 79th Secretary of… path:2,HTML,1,BODY,1,DIV,0,DIV,16,DIV,5,DIV selector:div.dialog-off-canvas-main-canvas > div#pg__c > div#main-content > div#preface-inner snippet:<div class="clearfix preface-region" id="preface-inner"> type:node] score:0.163216 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwlxdu3cOWxw.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:164 height:15 left:131 right:202 top:149 width:70] lhId:page-8-A nodeLabel:MyMoney.gov path:2,HTML,1,BODY,1,DIV,0,DIV,7,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,DIV,0,P,1,A selector:div > div.treasury-america250-banner > p > a snippet:<a href="https://www.mymoney.gov/"> type:node] score:0.001531 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:238 height:36 left:356 right:392 top:202 width:36] lhId:page-7-SPAN nodeLabel:MENU path:2,HTML,1,BODY,1,DIV,0,DIV,10,HEADER,0,DIV,0,DIV,0,DIV,0,DIV,0,BUTTON,1,SPAN selector:div#region-header > div#block-burgermenublock-2 > button.burger > span.hidden-text snippet:<span class="hidden-text"> type:node] score:0.000113] map[node:map[boundingRect:map[bottom:41 height:16 left:153 right:169 top:25 width:16] lhId:page-11-::after nodeLabel:div.usa-banner__inner > div.grid-col-fill > p.usa-banner__header-action > ::after path:2,HTML,1,BODY,1,DIV,0,DIV,6,SECTION,0,DIV,0,HEADER,0,DIV,1,DIV,1,P,0,::after selector:div.usa-banner__inner > div.grid-col-fill > p.usa-banner__header-action > ::after snippet:<::after> type:node] score:8e-06 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://home.treasury.gov/libraries/uswds/dist/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2]]] 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
/libraries/uswds/dist/fonts/source-sans-pro/sourcesanspro...120 ms
/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpP...85 ms
/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu...45 ms
/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zwlxdu...35 ms
/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj...30 ms

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
Treasury building in the winter. div.treas-slideshow > div.slide__image > div.field-content > img
home.treasury.gov/system/files/2025-12/Treasury-building-snow.png2.5 MiB2.5 MiB
Treasury Seal div > div.featured-stories--horizontal > span > img.image-style-featured
/system/files/styles/featured/private/default_images/Gree...171.1 KiB151.7 KiB
aside.two-two-row2-col2 > div.block-region-row2-col2 > div.block > ::after aside.two-two-row2-col2 > div.block-region-row2-col2 > div.block > ::after
home.treasury.gov/themes/custom/hamilton/sass/components/tile-link/box-blue.png117.2 KiB79.5 KiB
Secretary Scott Bessent div.treas-slideshow > div.slide__image > div.field-content > img
home.treasury.gov/system/files/136/secretary-bessent-homepage-1.jpg94.1 KiB75.0 KiB
Freedom 250 logo div#banner--treasury-alert > div.treasury-america250-banner > span.treasury-america250-banner__brand > img.treasury-america250-banner__logo
home.treasury.gov/themes/custom/hamilton/images/freedom-250-logo-color.png44.2 KiB44.2 KiB
aside.two-two-row2-col2 > div.block-region-row2-col2 > div.block > ::after aside.two-two-row2-col2 > div.block-region-row2-col2 > div.block > ::after
home.treasury.gov/themes/custom/hamilton/sass/components/tile-link/box-gray.png68.6 KiB30.8 KiB
div#pg__c > footer#footer > div#portal-footer > ::before div#pg__c > footer#footer > div#portal-footer > ::before
home.treasury.gov/themes/custom/hamilton/sass/components/footer/seal.png21.7 KiB19.6 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:1486.2880009765624 label:Time to first byte subpart:timeToFirstByte] map[duration:10.8719990234375 label:Resource load delay subpart:resourceLoadDelay] map[duration:777.335 label:Resource load duration subpart:resourceLoadDuration] map[duration:379.894 label:Element render delay subpart:elementRenderDelay]]
lhId: page-3-IMG
nodeLabel: Secretary Scott Bessent
path: 2,HTML,1,BODY,1,DIV,0,DIV,16,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,ARTICLE,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG
selector: div.treas-slideshow > div.slide__image > div.field-content > img
snippet: <img src="/system/files/136/secretary-bessent-homepage-1.jpg" alt="Secretary Scott Bessent">

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-3-IMG
nodeLabel: Secretary Scott Bessent
path: 2,HTML,1,BODY,1,DIV,0,DIV,16,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,ARTICLE,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG
selector: div.treas-slideshow > div.slide__image > div.field-content > img
snippet: <img src="/system/files/136/secretary-bessent-homepage-1.jpg" alt="Secretary Scott Bessent">

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.

URLTransfer SizeDuration
/sites/default/files/js/js_hoOrcluwgkAeT6ZqgVtVXDUa0Q6Dpi...38.8 KiB450 ms
/sites/default/files/css/css_uCi-fy9m2pDKqUD32quD8CZ864_0...90.4 KiB1.4 s
/sites/default/files/css/css_00cNwv72zd11kA6rKNtHOzIkos2T...8.7 KiB
/sites/default/files/css/css_zbin96D660k4JaDc3rCqDzjG7aza...2.2 KiB
/sites/default/files/js/js_EF_HuS9dv1flDPUbFVgB5fqP820q55...32.2 KiB300 ms
fonts.googleapis.com/css?family=Open+Sans:400,700,3001.8 KiB
fonts.googleapis.com/css?family=Signika:400,700596 B
fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,700915 B176 ms
fonts.googleapis.com/css?family=Merriweather:400,700,3001.1 KiB835 ms

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

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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: 2.2 s
URLTime Spent
treas.gov/1.2 s
www.treasury.gov/981 ms
home.treasury.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
Featured Stories January 28, 2025 Scott Bessent sworn in as 79th Secretary of… div.dialog-off-canvas-main-canvas > div#pg__c > div#main-content > div#preface-inner
0.163
MyMoney.gov div > div.treasury-america250-banner > p > a
0.002
MENU div#region-header > div#block-burgermenublock-2 > button.burger > span.hidden-text
0.000
div.usa-banner__inner > div.grid-col-fill > p.usa-banner__header-action > ::after div.usa-banner__inner > div.grid-col-fill > p.usa-banner__header-action > ::after
0.000

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: 420 ms 84.6 KiB
URLTransfer SizeEst Savings
/sites/default/files/css/css_uCi-fy9m2pDKqUD32quD8CZ864_0...89.9 KiB84.6 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: 1.5 s 432.1 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147.0 KiB105.8 KiB
/sites/default/files/js/js_h9tBUrkLUDgMVdF74hwOrsFhbGJ6KH...97.1 KiB67.8 KiB
www.googletagmanager.com/gtag/js?id=UA-19138737-19&cx=c&gtm=4e64k1115.5 KiB63.7 KiB
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k1147.0 KiB62.5 KiB
www.googletagmanager.com/gtag/js?id=G-QTKLZK8R7K159.3 KiB62.1 KiB
s.go-mpulse.net/boomerang/M33KD-YMV8Y-625W4-V96WF-R28AJ56.7 KiB37.1 KiB
/sites/default/files/js/js_hoOrcluwgkAeT6ZqgVtVXDUa0Q6Dpi...38.3 KiB33.0 KiB

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation1.0 s
Other547 ms
Style & Layout351 ms
Script Parsing & Compilation269 ms
Rendering78 ms
Parse HTML & CSS66 ms

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
home.treasury.gov/system/files/2025-12/Treasury-building-snow.png2.5 MiB
home.treasury.gov/themes/custom/hamilton/videos/freedom250-fireworks-overlay.mp4641.6 KiB
use.fontawesome.com/releases/v5.13.1/js/all.js428.4 KiB
/system/files/styles/featured/private/default_images/Gree...171.2 KiB
www.googletagmanager.com/gtag/js?id=G-QTKLZK8R7K159.6 KiB
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k1147.0 KiB
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147.0 KiB
home.treasury.gov/themes/custom/hamilton/sass/components/tile-link/box-blue.png117.3 KiB
www.googletagmanager.com/gtag/js?id=UA-19138737-19&cx=c&gtm=4e64k1115.6 KiB
/sites/default/files/js/js_h9tBUrkLUDgMVdF74hwOrsFhbGJ6KH...97.1 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
Freedom 250 logo div#banner--treasury-alert > div.treasury-america250-banner > span.treasury-america250-banner__brand > img.treasury-america250-banner__logo
home.treasury.gov/themes/custom/hamilton/images/freedom-250-logo-color.png
Secretary Scott Bessent div.treas-slideshow > div.slide__image > div.field-content > img
home.treasury.gov/system/files/136/secretary-bessent-homepage-1.jpg
Treasury building in the winter. div.treas-slideshow > div.slide__image > div.field-content > img
home.treasury.gov/system/files/2025-12/Treasury-building-snow.png
U.S. flag header.usa-banner__header > div.usa-banner__inner > div.grid-col-auto > img.usa-banner__header-flag
home.treasury.gov/libraries/uswds/src/img/us_flag_small.png

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

●Optimize DOM size
●Forced reflow
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 18 user timings
●JavaScript execution time 1.1 s
●Avoid long main-thread tasks 8 long tasks found
●Network Requests
●Network Round Trip Times 170 ms
●Server Backend Latencies 230 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 490 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
Google Privacy div.site-menu > ul > li > a
Careers div.site-menu > ul > li > a

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Learn More div#banner--treasury-alert > div.treasury-america250-banner > div.treasury-america250-banner__meta > a.treasury-america250-banner__cta
○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
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●`button`, `link`, and `menuitem` elements have accessible names
●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
●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
○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
○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
○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.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
92

Best Practices

User Experience

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
Freedom 250 logo div#banner--treasury-alert > div.treasury-america250-banner > span.treasury-america250-banner__brand > img.treasury-america250-banner__logo
home.treasury.gov/themes/custom/hamilton/images/freedom-250-logo-color.png38 x 22 (1.73)2052 x 1080 (1.90)

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. flag header.usa-banner__header > div.usa-banner__inner > div.grid-col-auto > img.usa-banner__header-flag
home.treasury.gov/libraries/uswds/src/img/us_flag_small.png16 x 1116 x 1124 x 17
●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
●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
●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
○Use a strong HSTS policy
○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.

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.

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.

Link destinationLink Text
freedom250.org/Learn More
home.treasury.gov/about/general-information/officials/scott-bessentRead More
home.treasury.gov/about/general-information/role-of-the-treasuryRead More

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

Crawling and Indexing

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.

Why this matters

Performance issues directly impact user engagement and conversion rates.

To appear in search results, crawlers need access to your app.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Page has successful HTTP status code
●Links are crawlable
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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