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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.

96

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.

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:0.118823] map[node:map[boundingRect:map[bottom:701 height:19 left:186 right:1174 top:682 width:988] lhId:page-1-DIV nodeLabel:2025 JCP EC Elections Results Published! path:2,HTML,1,BODY,3,TABLE,0,TBODY,0,TR,7,TD,2,TABLE,0,TBODY,0,TR,0,TD,0,TABLE,0,TBODY,0,TR,0,TD,43,DIV selector:tbody > tr > td#centercontent > div.header1 snippet:<div class="header1"> type:node] score:0.118674] map[node:map[boundingRect:map[bottom:295 height:24 left:186 right:1174 top:271 width:988] lhId:page-5-P nodeLabel:       path:2,HTML,1,BODY,3,TABLE,0,TBODY,0,TR,7,TD,2,TABLE,0,TBODY,0,TR,0,TD,0,TABLE,0,TBODY,0,TR,0,TD,13,P selector:tbody > tr > td#centercontent > p snippet:<p> type:node] score:0.000149]]

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.

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

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
jcp.org/images/logo-black.png1786.0 s100.5 KiB
jcp.org/images/Facebook_Logo_Primary.png1786.0 s54.1 KiB
jcp.org/images/logo2.gif1786.0 s6.9 KiB
s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38N-LMMNY-SBQP2604800.0 s56.8 KiB
jcp.org/images/ad_banner2.gif1786.0 s4.0 KiB
jcp.org/includes/scripts/menu.js1786.0 s3.3 KiB
jcp.org/includes/css/style.css1786.0 s2.6 KiB
jcp.org/includes/scripts/tabs.js1786.0 s2.0 KiB
jcp.org/images/bar_bot.gif1787.0 s1.3 KiB
jcp.org/includes/css/tabs.css1786.0 s1.2 KiB
jcp.org/includes/css/menu.css1786.0 s1.1 KiB
jcp.org/images/global/hd_quick-links.gif1787.0 s1.1 KiB
jcp.org/images/hd_my-jcp.gif1786.0 s1.1 KiB
jcp.org/images/hd_jcp-info.gif1787.0 s1.1 KiB
jcp.org/images/common/logo_oracle_footer.gif1786.0 s1.0 KiB
jcp.org/images/global/hd_news.gif1786.0 s1.0 KiB
jcp.org/images/hd_find-jsrs.gif1787.0 s1.0 KiB
jcp.org/images/button_go.gif1786.0 s925 B
jcp.org/images/global/hr_dots1.gif1787.0 s644 B
jcp.org/images/arrow_submenus.gif1787.0 s630 B
jcp.org/images/dots.gif1787.0 s619 B
jcp.org/images/hr_dots1.gif1787.0 s617 B
jcp.org/images/nav-arrow.gif1787.0 s605 B
jcp.org/images/common/trans.gif1787.0 s600 B
jcp.org/images/global/bar_green.gif1787.0 s597 B
jcp.org/images/spacer.gif1786.0 s593 B
jcp.org/images/global/spacer.gif1786.0 s592 B

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
Follow us on X (formerly Twitter) td#centercontent > p > a > img
jcp.org/images/logo-black.png99.9 KiB99.9 KiB
Find us on Facebook td#centercontent > p > a > img
jcp.org/images/Facebook_Logo_Primary.png53.5 KiB53.5 KiB

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 Size
jcp.org/includes/scripts/menu.js3.3 KiB
jcp.org/includes/scripts/tabs.js2.0 KiB
jcp.org/includes/css/tabs.css1.2 KiB
jcp.org/includes/css/style.css2.6 KiB
jcp.org/includes/css/menu.css1.1 KiB

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

Diagnostics

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
The page has an unload handler in a sub frame.Actionable

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: 20 ms 26.7 KiB
URLTransfer SizeEst Savings
s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38N-LMMNY-SBQP256.6 KiB26.7 KiB

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

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: 338 ms
URLTime Spent
jcp.org/228 ms
jcp.org/en/home/index110 ms
jcp.org/en/home/index0.0 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
2025 JCP EC Elections Results Published! tbody > tr > td#centercontent > div.header1
0.119
      tbody > tr > td#centercontent > p
0.000
●Optimize DOM size
●Font display
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Time to Interactive 0.7 s
●Max Potential First Input Delay 20 ms
●Minify CSS
●Minify JavaScript
●Reduce unused CSS
●Avoids enormous network payloads Total size was 259 KiB
●JavaScript execution time 0.0 s
●Minimizes main-thread work 0.2 s
●Image elements have explicit `width` and `height`
●Network Requests
●Network Round Trip Times 0 ms
●Server Backend Latencies 210 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 330 ms
○INP breakdown
○LCP request discovery
○User Timing marks and measures
○Avoid long main-thread tasks
○Avoid non-composited animations
56

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
Register for Site td#leftcontent > ul#p7PMnav > div.noNav > a
JCP Terms of Use td#leftcontent > ul#p7PMnav > div.noNav > a
Oracle Privacy Policy td#leftcontent > ul#p7PMnav > div.noNav > a
Welcome to the Java Community Process! tbody > tr > td#centercontent > div.header1
register now tbody > tr > td#centercontent > a
overview page tr > td#centercontent > p > a
Annual JCP Community Party at JavaOne 2026! tbody > tr > td#centercontent > div.header1
2025 JCP Award Winners! tbody > tr > td#centercontent > div.header1
2025 JCP Award winners tbody > tr > td#centercontent > a
December 2025 Newsletter is Released! tbody > tr > td#centercontent > div.header1
December 2025 edition of the JCP Newsletter tbody > tr > td#centercontent > a
December Public EC Meeting Agenda and Recording Published tbody > tr > td#centercontent > div.header1
The agenda and recording tr > td#centercontent > p > a
2025 JCP EC Elections Results Published! tbody > tr > td#centercontent > div.header1
results of the 2025 JCP EC elections tr > td#centercontent > p > a
25 Years of the JCP Program Celebration tbody > tr > td#centercontent > div.header1
Twenty-five years of the Java Community Process tr > td#centercontent > p > a
Celebrating 25 years of the JCP with JUGs around the world tr > td#centercontent > p > a
JCP Working Groups tbody > tr > td#centercontent > div.header1
Java in Education td#centercontent > ul > li > a
message from Heather VanCura ul > li > p > a
Java Ecosystem JCP Working Group td#centercontent > ul > li > a
Java and AI Working Group td#centercontent > ul > li > a
JSR Updates tbody > tr > td#centercontent > h1
New JSRs tr > td > b > a
JSR 402 tbody > tr > td > a
Public Reviews td > p > b > a
JSR 401 tr > td > p > a
Final Releases td > p > b > a
JSR 378 tr > td > p > a
JSR 381 tr > td > p > a
JSR 393 tr > td > p > a
JSR 394 tr > td > p > a
JSR 395 tr > td > p > a
JSR 396 tr > td > p > a
JSR 397 tr > td > p > a
JSR 398 tr > td > p > a
JSR 399 tr > td > p > a
JSR 400 tr > td > p > a
JSR 401 tr > td > p > a
Maintenance Reviews tr > td > b > a
Maintenance Releases td > p > b > a
JSR 384 tr > td > p > a
JSR 385 tr > td > p > a
JSR 387 tr > td > p > a
JSR 392 tr > td > p > a
JSR 907 tr > td > p > a
JSR 199 tr > td > p > a
JSR 221 tr > td > p > a
JSR 269 tr > td > p > a
Recent News and Announcements tbody > tr > td#centercontent > div.header1
Inside the JCP Executive Committee: Purpose, Structure, and Impact td#centercontent > ul > li > a
From Hokkaido to the World: How Hiroto Yamakawa Built a Java Community that Ins… td#centercontent > ul > li > a
Java in Education at the Dominican Republic Java User Group td#centercontent > ul > li > a
JCP's 25th Anniversary - Twenty-five years of the Java Community Process td#centercontent > ul > li > a
News and Announcements from the Program Management Office (PMO) tbody > tr > td#centercontent > a
Spec Lead Guide tr > td#rightcontent > span.rightcol > a
JCP 2 tr > td#rightcontent > span.rightcol > a
EC meeting summaries tr > td#rightcontent > span.rightcol > a
Calendar tr > td#rightcontent > span.rightcol > a
Multimedia page tr > td#rightcontent > span.rightcol > a
Submit a new JSR tr > td#rightcontent > span.rightcol > a
JCP Community Github tr > td#rightcontent > span.rightcol > a
JSR 221 JDBC 4.5 Maintenance Release td#rightcontent > span.rightcol > b > a
JSR 401 Java SE 26 Final Release td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing API Maintenance Release 12 td#rightcontent > span.rightcol > b > a
JSR 401 Java SE 26 Public Review td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing API Maintenance Review 20 td#rightcontent > span.rightcol > b > a
JSR 402 Java SE 27 iteration begins td#rightcontent > span.rightcol > b > a
JSR 221 JDBC 4 API Specification Maintenance Review 5 td#rightcontent > span.rightcol > b > a
JSR 400 Java SE 25 Final Release td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing API Maintenance Release 11 td#rightcontent > span.rightcol > b > a
JSR 400 Java SE 25 Public Review td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing API Maintenance Review 19 td#rightcontent > span.rightcol > b > a
JSR 401 Java SE 26 iteration begins td#rightcontent > span.rightcol > b > a
JSR 399 Java SE 24 Final Release td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing API Maintenance Release 10 td#rightcontent > span.rightcol > b > a
JSR 199 Java Compiler API Maintenance Release 5 td#rightcontent > span.rightcol > b > a
JSR 399 Java SE 24 Public Review td#rightcontent > span.rightcol > b > a
JSR 199 Java Compiler API Maintenance Review 8 td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing API Maintenance Review 18 td#rightcontent > span.rightcol > b > a
JSR 400 Java SE 25 iteration begins td#rightcontent > span.rightcol > b > a
JSR 398 Java SE 23 Final Release td#rightcontent > span.rightcol > b > a
JSR 199 Java Compiler API Maintenance Release 4 td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing API Maintenance Release 9 td#rightcontent > span.rightcol > b > a
JSR 398 Java SE 23 Public Review td#rightcontent > span.rightcol > b > a
JSR 199 Java Compiler API Maintenance Review 7 td#rightcontent > span.rightcol > b > a
JSR 282 Real-Time Specification for Java 2.0 Final Release td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing API Maintenance Review 17 td#rightcontent > span.rightcol > b > a
JSR 392 Java SE 17 Maintenance Release td#rightcontent > span.rightcol > b > a
JSR 384 Java SE 11 Maintenance Release 3 td#rightcontent > span.rightcol > b > a
JSR 337 Java SE 8 Release Contents Maintenance Release 6 td#rightcontent > span.rightcol > b > a
JSR 399 Java SE 24 iteration begins td#rightcontent > span.rightcol > b > a
JSR 392 Java SE 17 Maintenance Review td#rightcontent > span.rightcol > b > a
JSR 384 Java SE 11 Maintenance Review 3 td#rightcontent > span.rightcol > b > a
JSR 337 Java SE 8 Release Contents Maintenance Review 6 td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing Maintenance Release td#rightcontent > span.rightcol > b > a
JSR 397 Java SE 22 Final Release td#rightcontent > span.rightcol > b > a
JSR 385 Units of Measurement API 2 Maintenance Release 2 td#rightcontent > span.rightcol > b > a
JSR 398 Java SE 23 iteration begins td#rightcontent > span.rightcol > b > a
JSR 396 Java SE 21 Final Release td#rightcontent > span.rightcol > b > a
JSR 269 Pluggable Annotation Processing API Maintenance Release 7 td#rightcontent > span.rightcol > b > a
JSR 384 Java SE 11 Maintenance Release 2 td#rightcontent > span.rightcol > b > a
JSR 337 Java SE 8 Maintenance Release 5 td#rightcontent > span.rightcol > b > a
JSR 384 Java SE 11 Maintenance Review 2 td#rightcontent > span.rightcol > b > a
JSR 337 Java SE 8 Maintenance Review 5 td#rightcontent > span.rightcol > b > a
JSR 378 Portlet 3.0 Bridge for JavaServer Faces 2.2 Final Release td#rightcontent > span.rightcol > b > a
JSR 243 Java Data Objects Maintenance Release 4 td#rightcontent > span.rightcol > b > a
JSR 381 Visual Recognition Specification Final Release td#rightcontent > span.rightcol > b > a
JSR 392 Java SE 17 Final Release td#rightcontent > span.rightcol > b > a
Contact Us body > div#footer > div.footleft > a
© 2026, Oracle Corporation and/or its affiliates. Terms of Use. Privacy Policy.… body > div#footer > div.footleft2
Terms of Use body > div#footer > div.footleft2 > a
Privacy Policy body > div#footer > div.footleft2 > a
Trademarks body > div#footer > div.footleft2 > a

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
JCP Terms of Use td#leftcontent > ul#p7PMnav > div.noNav > a
Oracle Privacy Policy td#leftcontent > ul#p7PMnav > div.noNav > a
register now tbody > tr > td#centercontent > a
overview page tr > td#centercontent > p > a
2025 JCP Award winners tbody > tr > td#centercontent > a
December 2025 edition of the JCP Newsletter tbody > tr > td#centercontent > a
The agenda and recording tr > td#centercontent > p > a
Twenty-five years of the Java Community Process tr > td#centercontent > p > a
Celebrating 25 years of the JCP with JUGs around the world tr > td#centercontent > p > a
Java in Education td#centercontent > ul > li > a
message from Heather VanCura ul > li > p > a
Java Ecosystem JCP Working Group td#centercontent > ul > li > a
Java and AI Working Group td#centercontent > ul > li > a
JSR 402 tbody > tr > td > a
JSR 401 tr > td > p > a
JSR 378 tr > td > p > a
JSR 381 tr > td > p > a
JSR 393 tr > td > p > a
JSR 394 tr > td > p > a
JSR 395 tr > td > p > a
JSR 396 tr > td > p > a
JSR 397 tr > td > p > a
JSR 398 tr > td > p > a
JSR 399 tr > td > p > a
JSR 400 tr > td > p > a
JSR 401 tr > td > p > a
JSR 384 tr > td > p > a
JSR 385 tr > td > p > a
JSR 387 tr > td > p > a
JSR 392 tr > td > p > a
JSR 907 tr > td > p > a
JSR 199 tr > td > p > a
JSR 221 tr > td > p > a
JSR 269 tr > td > p > a
Terms of Use body > div#footer > div.footleft2 > a
Privacy Policy body > div#footer > div.footleft2 > a
Trademarks body > div#footer > div.footleft2 > a

These are opportunities to improve the legibility of your content.

Internationalization and localization

If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

These are opportunities to improve the interpretation of your content by users in different locales.

Names and labels

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#tools > div.search > form#[object HTMLInputElement] > input.form div#tools > div.search > form#[object HTMLInputElement] > input.form
tr > td#leftcontent > form#[object HTMLInputElement] > input.form tr > td#leftcontent > form#[object HTMLInputElement] > input.form

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
JSRs by Platform JSRs by Technology JSRs by Stage JSRs by Committee List of All… tbody > tr > td#leftcontent > ul#p7PMnav

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

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
JSRs by Platform td#leftcontent > ul#p7PMnav > li > a
JSRs by Technology td#leftcontent > ul#p7PMnav > li > a
JSRs by Stage td#leftcontent > ul#p7PMnav > li > a
JSRs by Committee td#leftcontent > ul#p7PMnav > li > a
List of All JSRs td#leftcontent > ul#p7PMnav > li > a
About JCP td#leftcontent > ul#p7PMnav > li > a.p7PMtrg
Get Involved td#leftcontent > ul#p7PMnav > li > a.p7PMtrg
Community Resources td#leftcontent > ul#p7PMnav > li > a.p7PMtrg
Community News td#leftcontent > ul#p7PMnav > li > a.p7PMtrg
FAQ td#leftcontent > ul#p7PMnav > li > a
Contact Us td#leftcontent > ul#p7PMnav > li > a
New JSRs tr > td > b > a
Public Reviews td > p > b > a
Final Releases td > p > b > a
Inside the JCP Executive Committee: Purpose, Structure, and Impact td#centercontent > ul > li > a
From Hokkaido to the World: How Hiroto Yamakawa Built a Java Community that Ins… td#centercontent > ul > li > a
Java in Education at the Dominican Republic Java User Group td#centercontent > ul > li > a
JCP's 25th Anniversary - Twenty-five years of the Java Community Process td#centercontent > ul > li > a
JCP 2 tr > td#rightcontent > span.rightcol > a
Calendar tr > td#rightcontent > span.rightcol > a
Multimedia page tr > td#rightcontent > span.rightcol > a
Submit a new JSR tr > td#rightcontent > span.rightcol > a
JCP Community Github tr > td#rightcontent > span.rightcol > a

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

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-hidden="true"]` is not present on the document `<body>`
●Image elements have `[alt]` attributes
●Input buttons have discernible text.
●Document has a `<title>` element
●Links have a discernible name
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●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
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`[aria-*]` attributes match their roles
○`button`, `link`, and `menuitem` elements have accessible names
○ARIA attributes are used as specified for the element's role
○Deprecated ARIA roles were not used
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○`[aria-hidden="true"]` elements do not contain focusable descendents
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements use only permitted ARIA attributes
○`[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
○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
○`[aria-*]` attributes have valid values
○`[aria-*]` attributes are valid and not misspelled
○Buttons have an accessible name
○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 a valid value for its `[lang]` attribute
○`<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">`
○`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○No element has a `[tabindex]` value greater than 0
○`<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.
○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.
73

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
Java Community Process div#header > div#logo > a > img
jcp.org/images/spacer.gif151 x 811 x 1151 x 81
tbody > tr > td#rightcontent > img tbody > tr > td#rightcontent > img
jcp.org/images/global/spacer.gif150 x 51 x 1150 x 5

Browser Compatibility

Specifying a doctype prevents the browser from switching to quirks-mode. Learn more about the doctype declaration.

Why this matters

Performance issues directly impact user engagement and conversion rates.

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
Unload event listeners are deprecated and will be removed.
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●Uses HTTPS
●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
●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.

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

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