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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.

63

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 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:158.272 source:map[column:8788 line:1 type:source-location url:https://duckduckgo.com/_next/static/chunks/framework-64870e4997d77dcd.js 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:0.6 source:map[column:96483 line:0 type:source-location url:https://duckduckgo.com/_next/static/chunks/pages/%5Blocale%5D/home/mobile-426cc61491e964ed.js urlProvider:network]] map[reflowTime:4.014 source:map[column:26752 line:0 type:source-location url:https://duckduckgo.com/_next/static/chunks/pages/_app-907f2a2b90aba8a9.js urlProvider:network]] map[reflowTime:27.739 source:map[column:37903 line:0 type:source-location url:https://duckduckgo.com/_next/static/chunks/4751-69e0e9c695824b9a.js urlProvider:network]] map[reflowTime:77.959 source:map[column:6073 line:0 type:source-location url:https://duckduckgo.com/_next/static/chunks/5599-ef030bff867d48ec.js urlProvider:network]] map[reflowTime:10.561 source:map[column:70856 line:0 type:source-location url:https://duckduckgo.com/_next/static/chunks/9587-7e45286cb59e48ef.js urlProvider:network]] map[reflowTime:13.445 source:map[column:58621 line:0 type:source-location url:https://duckduckgo.com/_next/static/chunks/7458-55dd9af37e88136a.js urlProvider:network]] map[reflowTime:23.954 source:map[column:21308 line:0 type:source-location url:https://duckduckgo.com/_next/static/chunks/pages/_app-907f2a2b90aba8a9.js urlProvider:network]]]

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
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-3-mobile-lay...148.5 KiB141.3 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
duckduckgo.com/static-assets/image/pages/app/feature-image-2-layer2-light.png103.9 KiB98.8 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-3-mobile-lay...102.6 KiB97.5 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
duckduckgo.com/static-assets/image/pages/app/feature-image-2-layer3-light.png94.3 KiB89.7 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-1-mobile-lay...83.2 KiB79.1 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
duckduckgo.com/static-assets/image/pages/app/feature-image-2-layer1-light.png67.6 KiB64.3 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-3-mobile-lay...37.7 KiB35.8 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-1-mobile-lay...35.0 KiB33.3 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-1-mobile-lay...32.8 KiB31.2 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-1-mobile-lay...24.5 KiB23.3 KiB
section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a > img section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a > img
duckduckgo.com/_next/static/media/google-play-store-v2.962e9ea3.png22.6 KiB22.4 KiB
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-3-mobile-lay...19.2 KiB18.3 KiB
div.home-btf-hero_heroButtonContainer__OurbA > a.app-hero-download-button_button__7du6k > span.button_icon__eid__ > img.app-hero-download-button_animatedDownloadIcon__UOKjA div.home-btf-hero_heroButtonContainer__OurbA > a.app-hero-download-button_button__7du6k > span.button_icon__eid__ > img.app-hero-download-button_animatedDownloadIcon__UOKjA
duckduckgo.com/static-assets/icons/animated-download-icon-light.gif14.0 KiB11.6 KiB
The browser that actively protects your personal information. Download DuckDuck… div.homepage-skeleton_root__hTNhj > main.minimal-homepage_layout__5B6f9 > div#features > main.app-legacy_root__gRed1
duckduckgo.com/static-assets/backgrounds/grain.png11.1 KiB9.5 KiB

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

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.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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 reduce Javascript execution time.

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 Evaluation2.6 s
Other917 ms
Style & Layout793 ms
Script Parsing & Compilation413 ms
Rendering105 ms
Parse HTML & CSS91 ms
Garbage Collection27 ms

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
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-1-mobile-lay...
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
duckduckgo.com/static-assets/image/pages/app/feature-image-2-layer1-light.png
div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri div.stack_root__raz5U > div > div.app-single-column-feature-cards_parallaxImage__j7R2N > img.app-single-column-feature-cards_imageLayer__QY_Ri
/static-assets/image/pages/app/feature-image-3-mobile-lay...
section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a > img section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a > img
duckduckgo.com/_next/static/media/google-play-store-v2.962e9ea3.png
section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a > img section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a > img
duckduckgo.com/_next/static/media/google-play-store-v2.962e9ea3.png
The Verge div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/the-verge-light.svg
Wired div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/wired-light.svg
Engadget div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/engadget-light.svg
CNET div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/cnet.svg
TechRadar div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/techradar-light.svg
The Verge div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/the-verge-light.svg
Wired div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/wired-light.svg
Engadget div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/engadget-light.svg
CNET div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/cnet.svg
TechRadar div > a.card_card___ZlNq > picture.themedImage_wrapper__Q1Y7W > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/techradar-light.svg
Apple App Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/apple-appstore-40.svg
Apple App Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/apple-appstore-40.svg
Apple App Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/apple-appstore-40.svg
Google Play Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/google-play.svg
Google Play Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/google-play.svg
Google Play Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/google-play.svg
Apple App Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/apple-appstore-40.svg
Apple App Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/apple-appstore-40.svg
Apple App Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/apple-appstore-40.svg
Google Play Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/google-play.svg
Google Play Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/google-play.svg
Google Play Store div.carousel_content__fdsrZ > div > a.card_card___ZlNq > img.quotes-carousel_sourceImage__4kfEC
duckduckgo.com/static-assets/image/pages/app/media-logos/google-play.svg

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

Use efficient cache lifetimes
Layout shift culprits
Document request latency
Optimize DOM size
Font display
LCP breakdown
Modern HTTP
Network dependency tree
Render blocking requests
Optimize viewport for mobile
Minify CSS
Minify JavaScript
Avoids enormous network payloads Total size was 2,428 KiB
User Timing marks and measures 4 user timings
Avoid long main-thread tasks 10 long tasks found
Page didn't prevent back/forward cache restoration
Network Requests
Network Round Trip Times 10 ms
Server Backend Latencies 50 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Avoid multiple page redirects
Initial server response time was short Root document took 0 ms
INP breakdown
LCP request discovery
Avoid non-composited animations
Avoid large layout shifts
91

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.

ARIA

Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid values. Learn more about valid values for ARIA attributes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Chrome div.chip-tabs_root___5P_z > div > div > button#tabs--tab--0

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Take back your privacy! div.mobile-atb-banner_atbBanner__2BCOH > div.mobile-atb-banner_wrapperComponent__f_cud > div.mobile-atb-banner_atbContent__j5f2T > h4.mobile-atb-banner_newTitle__0Ih7K
Learn more main.minimal-homepage_layout__5B6f9 > div.minimal-homepage_minimalHero__2yzex > div.homepage-cta-section_scrollCta__Wmixn > h6.heading_heading6__1lVXi
Protection div.app-hero-card-buttons_root__lL3qk > button.card_card___ZlNq > div.app-hero-card-buttons_headingAndBodyContainer__EdbRh > h5.app-hero-card-buttons_headingText__OaqQi
Protection div.app-hero-card-buttons_root__lL3qk > button.card_card___ZlNq > div.app-hero-card-buttons_headingAndBodyContainer__EdbRh > h5.app-hero-card-buttons_headingText__OaqQi
Goodbye Incognito mode, hello real privacy in every tab div.single-column-feature-card_bitesContainer__9erSa > div.single-column-feature-card-detail-bite_root__8q0rO > button.card_card___ZlNq > h5.single-column-feature-card-detail-bite_cardButtonHeading__KJQuU
Stop ads following you everywhere div.single-column-feature-card_bitesContainer__9erSa > div.single-column-feature-card-detail-bite_root__8q0rO > button.card_card___ZlNq > h5.single-column-feature-card-detail-bite_cardButtonHeading__KJQuU
Search without being tracked div.single-column-feature-card_bitesContainer__9erSa > div.single-column-feature-card-detail-bite_root__8q0rO > button.card_card___ZlNq > h5.single-column-feature-card-detail-bite_cardButtonHeading__KJQuU

These are opportunities to improve keyboard navigation in your application.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.minimal-homepage_minimalHero__2yzex > section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a div.minimal-homepage_minimalHero__2yzex > section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a
div.minimal-homepage_minimalHero__2yzex > section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a div.minimal-homepage_minimalHero__2yzex > section.mobile-badge-banner_hideOnLandscape__ji4KC > div.mobile-badge-banner_atbBadge__ISxcF > a
main.minimal-homepage_layout__5B6f9 > div.minimal-homepage_minimalHero__2yzex > div.homepage-cta-section_scrollCta__Wmixn > a.homepage-cta-section_scrollArow__of6hD main.minimal-homepage_layout__5B6f9 > div.minimal-homepage_minimalHero__2yzex > div.homepage-cta-section_scrollCta__Wmixn > a.homepage-cta-section_scrollArow__of6hD

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.

Screen readers have features to make navigating tables easier. Ensuring that `<td>` elements in a large table (3 or more cells in width and height) have an associated table header may improve the experience for screen reader users. Learn more about table headers.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Search privately by default Chat privately with popular AI chatb… div.stack_root__raz5U > div.stack_root__raz5U > div.stack_root__raz5U > table.marketing-compare-privacy-table_table__UDHdq
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 are valid and not misspelled
Buttons have an accessible name
Image elements have `[alt]` attributes
Form elements have associated labels
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
ARIA attributes are used as specified for the element's role
`[aria-hidden="true"]` elements do not contain focusable descendents
Elements use only permitted ARIA attributes
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.
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
Touch targets have sufficient size and spacing.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Document has a main landmark.
Deprecated ARIA roles were not used
Identical links have the same purpose.
Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
`[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 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
The document does not use `<meta http-equiv="refresh">`
`<object>` elements have alternate text
Select elements have associated label elements.
Skip links are focusable.
`<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.
96

Best Practices

General

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
Failed to load resource: the server responded with a status of 400 ()
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
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
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
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

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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