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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.

36

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
/signals/config/1553612424888078?v=2.9.303&r=stable&domai...1200.0 s127.4 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
/v1/js/10041335-10042655.js?environment=production&ver=1.0300.0 s61.1 KiB
/v1/js/10041335-10042655.js?environment=production?ver=1.0300.0 s57.2 KiB
cdn.livechatinc.com/tracking.js28800.0 s32.9 KiB
www.redditstatic.com/ads/pixel.js60.0 s19.0 KiB
/signals/config/787220167986438?v=2.9.303&r=stable&domain...1200.0 s16.8 KiB
resources.peta.org/googleAnalytics/global/ga_constants.js?ver=6.9.40.0 ms13.2 KiB
services.peta.org/validate.js?v=1.20.0 ms10.9 KiB
www.peta.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?14400.0 s12.8 KiB
cdn.onesignal.com/sdks/web/v16/OneSignalSDK.page.es6.js?v=160603259200.0 s42.1 KiB
tags.srv.stackadapt.com/events.js5.0 s7.7 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
/v3.6/customer/action/get_localization?organization_id=e7...599.0 s4.7 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.7 KiB
/api/v2/script/9ee35884-0ef0-48af-be3a-75255460d71c/widge...5046.0 s2.6 KiB
/v3.6/customer/action/get_configuration?organization_id=e...600.0 s1.5 KiB
resources.peta.org/googleAnalytics/petaUS/peta/gaBase.js?ver=6.9.40.0 ms1001 B
/collect?v=2&fmt=js&pid=3515218&time=1776813649855&url=ht...0.0 ms691 B
/rp.gif?ts=1776813643470&id=t2_j7s82s5t&event=PageVisit&m...0.0 ms666 B
/sync?c=16b6410431b6374e780104abb0443ca8&p=7d4adc634e3150...0.0 ms634 B
/v3.6/customer/action/get_dynamic_configuration?x-region=...0.0 ms603 B
/global-mapper/lc_license_id/15530271/region?jsonp=__lc_r...0.0 ms201 B
cdn.onesignal.com/sdks/web/v16/OneSignalSDK.page.js259200.0 s902 B
/tr/?id=1553612424888078&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms18 B
/tr/?id=787220167986438&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms16 B

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.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:33.131 source:map[column:157116 line:1 type:source-location url:https://www.peta.org/wp-content/themes/peta/build/index.js?ver=1776357774 urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:59.54 source:map[type:text value:[unattributed]]] map[reflowTime:1.06 source:map[column:8849 line:0 type:source-location url:https://www.peta.org/wp-content/plugins/pgb-slideshow/build/slideshow.js?ver=af94f50da015458a4bbb urlProvider:network]] map[reflowTime:0.495 source:map[column:3929 line:0 type:source-location url:https://www.peta.org/wp-content/plugins/pgb-slideshow/build/slideshow.js?ver=af94f50da015458a4bbb urlProvider:network]] map[reflowTime:0.617 source:map[column:14817 line:0 type:source-location url:https://www.peta.org/wp-content/plugins/pgb-slideshow/build/slideshow.js?ver=af94f50da015458a4bbb urlProvider:network]] map[reflowTime:0.565 source:map[column:50335 line:1 type:source-location url:https://www.peta.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:0.178 source:map[column:50393 line:1 type:source-location url:https://www.peta.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:0.161 source:map[column:50457 line:1 type:source-location url:https://www.peta.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:0.177 source:map[column:49637 line:1 type:source-location url:https://www.peta.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:0.268 source:map[column:49615 line:1 type:source-location url:https://www.peta.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:0.252 source:map[column:51395 line:1 type:source-location url:https://www.peta.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]] map[reflowTime:20.246 source:map[column:4892 line:0 type:source-location url:https://www.peta.org/wp-content/themes/peta/build/index.js?ver=1776357774 urlProvider:network]] map[reflowTime:10.228 source:map[column:11279 line:0 type:source-location url:https://www.peta.org/wp-content/themes/peta/build/index.js?ver=1776357774 urlProvider:network]] map[reflowTime:1.874 source:map[column:129769 line:0 type:source-location url:https://www.peta.org/wp-content/themes/peta/build/index.js?ver=1776357774 urlProvider:network]] map[reflowTime:0.18 source:map[column:110628 line:0 type:source-location url:https://www.peta.org/wp-content/themes/peta/build/index.js?ver=1776357774 urlProvider:network]] map[reflowTime:0.117 source:map[column:109757 line:0 type:source-location url:https://www.peta.org/wp-content/themes/peta/build/index.js?ver=1776357774 urlProvider:network]] map[reflowTime:0.289 source:map[column:107110 line:0 type:source-location url:https://www.peta.org/wp-content/themes/peta/build/index.js?ver=1776357774 urlProvider:network]] map[reflowTime:1.589 source:map[column:33975 line:0 type:source-location url:https://www.peta.org/wp-content/plugins/page-links-to/dist/new-tab.js?ver=3.4.1 urlProvider:network]]]

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.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.
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
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

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
Staff with suitcases filled with vegan food div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
www.peta.org/wp-content/uploads/2026/03/TSA-Donation-PIA-750x375.jpg81.2 KiB75.4 KiB
A demonstrator hung upside down as a 'chicken' div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
www.peta.org/wp-content/uploads/2026/04/Raisin-Canes-PIA--750x375.jpg73.1 KiB67.3 KiB
Demonstrators in pink elephant costimes div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
www.peta.org/wp-content/uploads/2026/04/Chanchal-PIA--750x375.jpg67.2 KiB61.4 KiB
Red Lobster demo div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
www.peta.org/wp-content/uploads/2026/04/Red-Lobster-PIA-750x375.jpg64.4 KiB58.5 KiB
Students seeing Abduction div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
www.peta.org/wp-content/uploads/2026/04/Abudction-PIA-750x375.jpg59.1 KiB53.3 KiB
Ingrid getting mock-chopped by someone dressed as a dying fish div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
www.peta.org/wp-content/uploads/2026/03/EN-Fish-Demo-2026--750x375.jpg56.9 KiB51.0 KiB
Viola demo div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
www.peta.org/wp-content/uploads/2026/04/Viola-PIA-750x375.jpg55.2 KiB49.3 KiB
div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170 div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170
www.peta.org/wp-content/uploads/2026/04/veg-mom-baby-cow-nature-ftc-298x436.jpg45.0 KiB41.9 KiB
A black jaguar looking at the viewer div.grid-item__inner > div.grid-item__thumb > a.grid-item__link > img.attachment-668x336
www.peta.org/wp-content/uploads/2025/05/black-jaguar-668x336.jpg54.9 KiB41.0 KiB
Goat costumes div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
/wp-content/uploads/2026/04/Paul-Smith-Demo-PIA-H-Giles-P...43.2 KiB37.6 KiB
A before and after for Kisa, who was heavily matted div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
www.peta.org/wp-content/uploads/2026/02/Kisa-Cat-PIA-750x375.jpg43.0 KiB37.4 KiB
A side by side view showing a severely matted dog next to a div#swiper-wrapper-10b162af8ca9c5115 > div.pgb-slideshow__slide > div.pgb-slideshow__slide-img > img.attachment-full
www.peta.org/wp-content/uploads/2026/04/Lucky-PIA-HP--750x375.jpg39.5 KiB34.3 KiB
Pastel Cargo act div.grid-item__inner > div.grid-item__thumb > a.grid-item__link > img.attachment-668x336
www.peta.org/wp-content/uploads/2026/03/Cargo-Act-2026-Pastel-668x336.jpg40.3 KiB26.4 KiB
S/N group div.grid-item__inner > div.grid-item__thumb > a.grid-item__link > img.attachment-668x336
/wp-content/uploads/2026/04/Final-PETA-Asia-GCF-April-202...38.5 KiB24.6 KiB
div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170 div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170
www.peta.org/wp-content/uploads/2026/04/wld-turtles-on-ramp-ftc-298x436.jpeg26.2 KiB23.1 KiB
Staff and client with cat div.grid-item__inner > div.grid-item__thumb > a.grid-item__link > img.attachment-668x336
www.peta.org/wp-content/uploads/2026/04/Cancun-April-2026-HP-Cat-668x336.jpg36.0 KiB22.3 KiB
div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170 div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170
www.peta.org/wp-content/uploads/2026/04/skn-down-ducks-ftc-298x436.jpg24.3 KiB21.2 KiB
Hearty vegan salad div#promo-acf-block-69a98e81db1d3 > div.promo__content > picture > img
www.peta.org/wp-content/uploads/2025/08/VSK-Food-2025-Avocado-Bowl-640x265-1.jpg43.6 KiB20.8 KiB
Dogs in Alaska’s dog-sledding industry are often kept chained outside in the bi… div.grid-item__inner > div.grid-item__thumb > a.grid-item__link > img.attachment-668x336
www.peta.org/wp-content/uploads/2026/04/image-40-602x336.png36.1 KiB20.7 KiB
div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170 div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170
/wp-content/uploads/2026/04/wld-sewn-rattlesnake-mouth-ft...20.4 KiB17.3 KiB
Beagle looking at the camera div.grid-item__inner > div.grid-item__thumb > a.grid-item__link > img.attachment-668x336
www.peta.org/wp-content/uploads/2026/04/Beagle-orangered-668x336.jpg25.7 KiB15.9 KiB
div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170 div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170
www.peta.org/wp-content/uploads/2026/04/ent-hdc-meridia-ftc-298x436.jpg16.7 KiB13.7 KiB
A languishing hen div.grid-item__inner > div.grid-item__thumb > a.grid-item__link > img.attachment-668x336
www.peta.org/wp-content/uploads/2026/02/Cage-Free-HP-Screencap-668x336.jpg22.0 KiB13.6 KiB
div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170 div.grid-item__thumb > a.grid-item__link > picture > img.attachment-300x170
www.peta.org/wp-content/uploads/2026/04/skn-steiff-mohair-bear-ftc-298x436.jpg15.4 KiB12.8 KiB

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: 802 ms
URLTime Spent
peta.org/802 ms
www.peta.org/0.0 ms

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

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: 150 ms 5.0 KiB

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: 0.0 ms 25.7 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.

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 Evaluation2.8 s
Other1.1 s
Style & Layout654 ms
Script Parsing & Compilation385 ms
Parse HTML & CSS171 ms
Rendering64 ms
Garbage Collection27 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 WebSocket cannot enter back/forward cache.Pending browser support

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

Layout shift culprits
Optimize DOM size
Font display
LCP breakdown
LCP request discovery
Modern HTTP
Optimize viewport for mobile
Minify CSS
User Timing marks and measures 14 user timings
Avoid long main-thread tasks 19 long tasks found
Image elements have explicit `width` and `height`
Network Requests
Network Round Trip Times 100 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 70 ms
INP breakdown
Avoid non-composited animations
Avoid large layout shifts
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
© iStock.com/Adrian Dockerty div.grid-item__inner > div.media-credit__wrap > div.media-credit > a.media-credit__credit-link
Go to slide 1 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Go to slide 2 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Go to slide 3 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Go to slide 4 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Go to slide 5 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Go to slide 6 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Go to slide 7 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Go to slide 8 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Go to slide 9 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Go to slide 10 div#pgb-slideshow-acf-block-69e779c788350 > div.pgb-slideshow__slider > div.pgb-slideshow__pagination > span.swiper-pagination-bullet
Novedades de Yucatán div.grid-item__inner > div.media-credit__wrap > div.media-credit > a.media-credit__credit-link
© iStock.com/EyeEm Mobile GmbH div.grid-item__inner > div.media-credit__wrap > div.media-credit > a.media-credit__credit-link
For Media: Order PSAs div.menu-for-media-container > ul#menu-for-media > li#menu-item-986778 > a
Contact Media Team div.menu-for-media-container > ul#menu-for-media > li#menu-item-986779 > a
Make a Monthly Gift div.menu-support-peta-container > ul#menu-support-peta > li#menu-item-986781 > a
Make a Memorial Gift div.menu-support-peta-container > ul#menu-support-peta > li#menu-item-986783 > a
Gifts in Wills div.menu-support-peta-container > ul#menu-support-peta > li#menu-item-986785 > a
What Is the Vanguard Society? div.menu-support-peta-container > ul#menu-support-peta > li#menu-item-986786 > a
Contact div.menu-general-info-container > ul#menu-general-info > li#menu-item-145390 > a
Contest Terms & Conditions div.menu-general-info-container > ul#menu-general-info > li#menu-item-145329 > a
Disclaimer div.menu-general-info-container > ul#menu-general-info > li#menu-item-151439 > a
Texting Terms & Conditions div.menu-general-info-container > ul#menu-general-info > li#menu-item-145337 > a
Terms of Use div.menu-general-info-container > ul#menu-general-info > li#menu-item-145334 > 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
TAKE ACTION div.grid-item__inner > div.grid-item__description > div.grid-item__button-wrap > a.site-button
TAKE ACTION div.grid-item__inner > div.grid-item__description > div.grid-item__button-wrap > a.site-button
TAKE ACTION div.grid-item__inner > div.grid-item__description > div.grid-item__button-wrap > a.site-button
TAKE ACTION div.grid-item__inner > div.grid-item__description > div.grid-item__button-wrap > a.site-button
TAKE ACTION div.grid-item__inner > div.grid-item__description > div.grid-item__button-wrap > a.site-button
TAKE ACTION div.grid-item__inner > div.grid-item__description > div.grid-item__button-wrap > a.site-button
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.
`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
`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Definition list items are wrapped in `<dl>` elements
Document has a `<title>` element
`<frame>` or `<iframe>` elements have a title
`<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
Identical links have the same purpose.
`[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 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
ARIA IDs are unique
No form fields have multiple labels
`<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.
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.
77

Best Practices

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
SharedStorage
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.
Fledge
AttributionReporting

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
Uncaught TypeError: Cannot read properties of undefined (reading 'on')
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
Serves images with appropriate resolution
Page has the HTML doctype
Properly defines charset
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
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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