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Lighthouse Desktop

· 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.

88

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:18.485 source:map[column:1679 line:1 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/cards-content-layered-module.js?tkblvm 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:2.125 source:map[column:5678 line:0 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/swiper-core.js urlProvider:network]] map[reflowTime:27.456 source:map[column:12090 line:0 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/swiper-core.js urlProvider:network]] map[reflowTime:11.156 source:map[column:1498 line:24 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:0.909 source:map[column:24378 line:0 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/map-module.js?tkblvm urlProvider:network]] map[reflowTime:0.172 source:map[column:22512 line:3 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/leaflet-src.js urlProvider:network]] map[reflowTime:3.677 source:map[column:41012 line:3 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/leaflet-src.js urlProvider:network]] map[reflowTime:0.665 source:map[column:123635 line:3 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/leaflet-src.js urlProvider:network]] map[reflowTime:1.609 source:map[column:6897 line:32 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:4.653 source:map[column:1511 line:32 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:1.07 source:map[column:7007 line:32 type:source-location url:https://www.mbda-systems.com/sites/mbda/files/js/js_mwu36U5w1hA-j95b_CRb5A9XOVA9Tc0uRCa6ohXZj_g.js?scope=footer&delta=0&language=en&theme=mbda&include=eJyVUtFu5DAI_KG95JMsbJPULTYRkPZyX1-ycaTdtJV6L_YwDBgDkLMxtG2EDoZJuNktEvzbxvvZcSJQpaKnjxhyhwvTNhWi0xSuRbFbAlNHHxiXW2J-K6hjv19VhpTbSYf3kpFPZ6iYC9xqzDCCcdUhrmbcgiZhf-7B4Tri-Qh_5A3_WuAFUrHtiS9GGBSTFc-XZV2AQpSSZzxkEbSjmTgC_VHbqLT54Ag2Xk2HidlQnrkXhHxylQnTSngWeGXvH9Tgp7G44upv8O5FgqSXEOFLzquHZYZWtO41CF85H57XFUCsJOp_6w3QIYFkDclHj82CfwUF81XDdfENubAVlitTVHdwpz2n4IgVCgWO06oJdtXhM4H05k0NdZ8KPyzF4yyusuDFIorv0HGHYgHMqzf4Xj-x1H3jmkGyu_WztuGHCnMdT-D9937bU9--RPnK5zWZjh345rb1l9Kev3ft_4K6-QmEW3vc urlProvider:network]] map[reflowTime:0.743 source:map[column:12585 line:0 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/swiper-core.js urlProvider:network]] map[reflowTime:0.966 source:map[column:2899 line:16 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:1.968 source:map[column:1006 line:0 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/cards-content-layered-module.js?tkblvm urlProvider:network]] map[reflowTime:0.315 source:map[column:8929 line:32 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:1.006 source:map[column:9072 line:32 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:3.875 source:map[column:9225 line:32 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:4.011 source:map[column:9249 line:32 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:1.33 source:map[column:9261 line:32 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:5.928 source:map[column:2574 line:32 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js urlProvider:network]] map[reflowTime:0.787 source:map[column:2724 line:32 type:source-location url:https://www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js 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.

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

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/mbda/files/js/js_nwGMf6a7_6pTFqqKrH_WZ6-de-_AvaNqY...379 B
/sites/mbda/files/js/js_9IgbLrbZtjXjFPQz95gLcZRUeGRKGg_6H...549 B
/sites/mbda/files/js/js_AVcehdrN0mVk3sQ-jMfMUyzJO02KWQrNU...846 B
/sites/mbda/files/js/js_mwu36U5w1hA-j95b_CRb5A9XOVA9Tc0uR...57.4 KiB
/sites/mbda/files/js/js_LzXdAlsoT_2BClEwm1cF8fRlNjTyzcEha...3.6 KiB
/sites/mbda/files/css/css_VdEIEPqOBXFpbDmmISxeiunbClLarQ4...40.2 KiB80 ms
www.mbda-systems.com/modules/contrib/seckit/css/seckit.no_body.css204 B
/sites/mbda/files/js/js__ZzLNgmjp0fW0BBY6xy2TIA1ikwcin3dQ...408 B
/sites/mbda/files/js/js_dRXmDYtfWiifaq4TIikoTfGsj-IfWm__A...1.5 KiB
/sites/mbda/files/css/css_xIw2EZXNq_d54hwxqOA5g-xcOJdiT3t...6.5 KiB

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
cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1/dist/cookiesjsr.min.js?v=1.0.13604800.0 s109.5 KiB
cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1/dist/cookiesjsr-preloader.min.js604800.0 s8.4 KiB

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.

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
ORP Wicher frigate launch - Miecznik programme div.article-preview__img-wrapper > div.media > picture > img.max-w-[77px]
/sites/mbda/files/styles/m_article_preview__2xl/public/20...126.5 KiB123.6 KiB
div.article-preview__img-wrapper > div.media > picture > img.media__element div.article-preview__img-wrapper > div.media > picture > img.media__element
/sites/mbda/files/styles/m_article_preview__2xl/public/im...26.2 KiB23.3 KiB
SL ASRAAM div.article-preview__img-wrapper > div.media > picture > img.max-w-[77px]
/sites/mbda/files/styles/m_article_preview__2xl/public/20...12.9 KiB7.4 KiB
FIA 2026 div.article-preview__img-wrapper > div.media > picture > img.max-w-[77px]
/sites/mbda/files/styles/m_article_preview__2xl/public/20...12.3 KiB6.8 KiB
MBDA at FIA2026 div.article-preview__img-wrapper > div.media > picture > img.max-w-[77px]
/sites/mbda/files/styles/m_article_preview__2xl/public/20...11.6 KiB6.1 KiB

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

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: 40 ms 32.6 KiB
URLTransfer SizeEst Savings
/sites/mbda/files/css/css_VdEIEPqOBXFpbDmmISxeiunbClLarQ4...40.1 KiB32.6 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: 400 ms 544.6 KiB
URLTransfer SizeEst Savings
/themes/custom/mbda/integration/dist/assets/leaflet-src.j...197.6 KiB152.3 KiB
www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/leaflet-src.js197.6 KiB100.5 KiB
/themes/custom/mbda/integration/dist/assets/swiper-core.j...70.5 KiB64.8 KiB
www.mbda-systems.com/sites/mbda/files/addtoany/menu/iho16r34/core.iho16r34.js70.8 KiB57.8 KiB
cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1/dist/cookiesjsr.min.js?v=1.0.13108.8 KiB49.7 KiB
www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js116.9 KiB46.7 KiB
www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/swiper-core.js70.5 KiB36.7 KiB
/sites/mbda/files/js/js_mwu36U5w1hA-j95b_CRb5A9XOVA9Tc0uR...57.3 KiB36.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.6 KiB
URLTransfer SizeEst Savings
/modules/custom/mbda/tracking_matomo/js/mbda_tracking_mat...5.2 KiB2.6 KiB

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
/sites/mbda/files/2025-07/air-dominance-adobestock-621540...2.7 MiB
www.mbda-systems.com/562.0 KiB
/themes/custom/mbda/integration/dist/assets/Lato-Semibold...224.3 KiB
/themes/custom/mbda/integration/dist/assets/Lato-Medium.w...217.9 KiB
www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/leaflet-src.js197.9 KiB
/themes/custom/mbda/integration/dist/assets/leaflet-src.j...197.9 KiB
/sites/mbda/files/styles/m_article_preview__2xl/public/20...126.8 KiB
www.mbda-systems.com/themes/custom/mbda/integration/dist/assets/ScrollTrigger.js117.1 KiB
cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1/dist/cookiesjsr.min.js?v=1.0.13109.5 KiB
/sites/mbda/files/2025-07/maritime-superiority-adobestock...104.2 KiB

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

●Time to Interactive 1.7 s
●Layout shift culprits
●Optimize DOM size
●Font display
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Max Potential First Input Delay 40 ms
●Minify CSS
●JavaScript execution time 0.1 s
●Minimizes main-thread work 1.3 s
●Avoid non-composited animations 13 animated elements found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 20 ms
●Server Backend Latencies 30 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 40 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○LCP request discovery
○User Timing marks and measures
○Avoid long main-thread tasks
86

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

When an element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to make command elements more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#map > div.leaflet-pane > div.leaflet-pane > div.leaflet-marker-icon div#map > div.leaflet-pane > div.leaflet-pane > div.leaflet-marker-icon

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.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
nav.slider-navigation > ul.slider-navigation__list > li.slider-navigation__item > button.slider-navigation__btn nav.slider-navigation > ul.slider-navigation__list > li.slider-navigation__item > button.slider-navigation__btn
nav.slider-navigation > ul.slider-navigation__list > li.slider-navigation__item > button.slider-navigation__btn nav.slider-navigation > ul.slider-navigation__list > li.slider-navigation__item > button.slider-navigation__btn
nav.slider-navigation > ul.slider-navigation__list > li.slider-navigation__item > button.slider-navigation__btn nav.slider-navigation > ul.slider-navigation__list > li.slider-navigation__item > button.slider-navigation__btn
nav.slider-navigation > ul.slider-navigation__list > li.slider-navigation__item > button.slider-navigation__btn nav.slider-navigation > ul.slider-navigation__list > li.slider-navigation__item > button.slider-navigation__btn
div.slider-wrapper > div.absolute > div.navigation-buttons > button.px-4 div.slider-wrapper > div.absolute > div.navigation-buttons > button.px-4
div.slider-wrapper > div.absolute > div.navigation-buttons > button.px-4 div.slider-wrapper > div.absolute > div.navigation-buttons > button.px-4
div.slider-wrapper > div.navigation-buttons-container > div.navigation-buttons > button.px-4 div.slider-wrapper > div.navigation-buttons-container > div.navigation-buttons > button.px-4
div.slider-wrapper > div.navigation-buttons-container > div.navigation-buttons > button.px-4 div.slider-wrapper > div.navigation-buttons-container > div.navigation-buttons > button.px-4
div#38849 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#38849 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#38848 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#38848 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#5568 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#5568 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#5567 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#5567 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#5569 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#5569 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#6515 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#6515 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#6514 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#6514 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#6378 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#6378 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#6377 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#6377 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#6376 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#6376 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#6375 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#6375 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#5588 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#5588 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#5587 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#5587 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#5586 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#5586 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#5584 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#5584 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#5582 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#5582 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#5581 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#5581 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#4485 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#4485 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#4484 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#4484 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#4248 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#4248 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container
div#4247 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container div#4247 > div.cartography-card__content > div.cartography-card__content-wrapper > button.close-popup-container

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.

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
MBDA IS A GLOBAL ACTOR FOR THE DEFENCE INDUSTRY div.highlight-placeholder > div.certified-div-container > div.flex > p.highlight-title
FIRMLY ANCHORED AT LOCAL LEVEL, OUR TEAMS WORK EVERY DAY TO ENSURE EXCELLENCE I… div.highlight-placeholder > div.certified-div-container > div.highlight-list > p
COOKIE SETTINGS div.cookiesjsr--app > div.cookiesjsr-banner > div.cookiesjsr-banner--action > button.cookiesjsr-btn

These are opportunities to improve the legibility of your content.

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
ADAS div.exhibitions__info > div.exhibitions__title > div.normal-case > h4
About us div.block > a > div.mb-7 > h4

These are opportunities to improve keyboard navigation in your application.

○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
●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
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[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
○`<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
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○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
○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.
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
about:blank
Failed to load resource: net::ERR_UNKNOWN_URL_SCHEME
about:blank
Failed to load resource: net::ERR_UNKNOWN_URL_SCHEME
about:blank
Failed to load resource: net::ERR_UNKNOWN_URL_SCHEME
about:blank
Failed to load resource: net::ERR_UNKNOWN_URL_SCHEME
about:blank
Failed to load resource: net::ERR_UNKNOWN_URL_SCHEME
●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
●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

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

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