Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/webfonts/fa-brands-400.woff2	65 ms
www.criteo.com/wp-content/themes/criteo2017/fonts/fa-brands-400.woff	25 ms
www.criteo.com/wp-content/themes/criteo2017/fonts/fa-brands-400.ttf	15 ms

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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:42.389 source:map[type:text value:[unattributed]]]]

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG

nodeLabel: body.home > div#page-modular > section#sID-0 > img.hero-bg-grid

path: 1,HTML,1,BODY,7,DIV,1,SECTION,0,IMG

selector: body.home > div#page-modular > section#sID-0 > img.hero-bg-grid

snippet: <img src="https://www.criteo.com/wp-content/uploads/2025/03/Homepage-Hero-bg.png" class="hero-bg-grid">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/all.min.css	10.9 KiB	826 ms
www.criteo.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	35.0 KiB	150 ms
www.criteo.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1	5.5 KiB
www.criteo.com/wp-content/themes/criteo2017/js/cookies.js	778 B

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.

Request	Cache TTL	Transfer Size
cdn.drda.io/scripts/analytics/next/dreamdata.cl.min.js	1800.0 s	34.6 KiB
web.cmp.usercentrics.eu/ui/TvGdprCmpView.f8e69ac0.js	3600.0 s	29.4 KiB
web.cmp.usercentrics.eu/ui/loader.js	3600.0 s	15.7 KiB
app.usercentrics.eu/session/1px.png?settingsId=eETjrQB6y3u-TA	1800.0 s	1023 B
/a?v=3&t=l&pid=1283422330&rv=64f0&tag_exp=0~115938465~115...	0.0 ms	11 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.

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.

	URL	Resource Size	Est Savings
div.row > div.quote-wrapper > div.quote_author > img.mr-st-6 `div.row > div.quote-wrapper > div.quote_author > img.mr-st-6`	www.criteo.com/wp-content/uploads/2025/03/Adele-Nasr-Headshot.jpg	76.9 KiB	76.0 KiB
div.content-box-wrapp > div.content-box > div.tab-content-image > img `div.content-box-wrapp > div.content-box > div.tab-content-image > img`	www.criteo.com/wp-content/uploads/2025/03/hp-bento-advertisers-retail-media.png	58.1 KiB	47.0 KiB
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`	www.criteo.com/wp-content/uploads/2026/02/Wine-Country-Logo-250.png	15.6 KiB	13.1 KiB
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`	www.criteo.com/wp-content/uploads/2024/01/Represent_Black.png	6.6 KiB	6.4 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: 759 ms

URL	Time Spent
criteo.com/	759 ms
www.criteo.com/	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

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: 750 ms 160.9 KiB

URL	Transfer Size	Est Savings
www.criteo.com/wp-content/themes/criteo2017/css/theme.min.css?ver=2026041656	143.3 KiB	137.2 KiB
.overlay { --color-cmp-overlay: #303030; --feature-overlay-opacity: 0.4; } …	14.8 KiB	13.5 KiB
cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/all.min.css	10.2 KiB	10.1 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: 300 ms 636.6 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-W0WYERL9HS&cx=c&gtm=4e64f0	174.7 KiB	112.0 KiB
/assets/external/engines/hls_video.js@4a7b909604c9049f14b...	158.7 KiB	82.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-M4Z343H	193.8 KiB	74.3 KiB
fast.wistia.com/assets/external/publicApi.js	146.8 KiB	67.6 KiB
www.googletagmanager.com/gtag/js?id=G-W0WYERL9HS	175.7 KiB	66.2 KiB
www.googletagmanager.com/gtag/js?id=AW-878667505&cx=c&gtm=4e64f0	146.0 KiB	63.8 KiB
www.googletagmanager.com/gtag/js?id=DC-12766688&cx=c&gtm=4e64f0	129.2 KiB	62.5 KiB
web.cmp.usercentrics.eu/ui/v/3.114.0/WebSdk.lib.c9b98563.js	55.9 KiB	35.9 KiB
www.criteo.com/wp-content/themes/criteo2017/js/theme.min.js?ver=2026041656	54.0 KiB	29.4 KiB
browser.sentry-cdn.com/9.6.1/bundle.min.js	24.6 KiB	21.1 KiB
www.criteo.com/wp-content/themes/criteo2017/js/select2.min.js	45.2 KiB	21.0 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
/wp-content/plugins/motionpage/assets/js/gsap/ScrollTrigg...	9.1 s	147 ms	3.7 ms
www.criteo.com/	2.2 s	604 ms	28 ms
Unattributable	1.9 s	159 ms	0.0 ms
/wp-content/plugins/motionpage/assets/js/gsap/gsap.min.js...	1.9 s	46 ms	9.4 ms
fast.wistia.com/assets/external/publicApi.js	1.3 s	1.0 s	76 ms
/assets/external/engines/hls_video.js@4a7b909604c9049f14b...	1.0 s	780 ms	2.7 ms
www.criteo.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	626 ms	387 ms	8.2 ms
www.googletagmanager.com/gtag/js?id=G-W0WYERL9HS	536 ms	462 ms	68 ms
www.googletagmanager.com/gtm.js?id=GTM-M4Z343H	480 ms	391 ms	68 ms
www.googletagmanager.com/gtag/js?id=AW-878667505&cx=c&gtm=4e64f0	379 ms	325 ms	48 ms
fast.wistia.com/player.js	378 ms	341 ms	25 ms
web.cmp.usercentrics.eu/ui/v/3.114.0/WebSdk.lib.c9b98563.js	269 ms	205 ms	25 ms
www.criteo.com/wp-content/themes/criteo2017/js/theme.min.js?ver=2026041656	246 ms	212 ms	22 ms
www.googletagmanager.com/gtag/js?id=DC-12766688&cx=c&gtm=4e64f0	236 ms	191 ms	43 ms
js-agent.newrelic.com/nr-full-1.312.1.min.js	181 ms	146 ms	10.0 ms
cdn.drda.io/scripts/analytics/next/dreamdata.cl.min.js	151 ms	128 ms	19 ms
www.googletagmanager.com/gtag/js?id=G-W0WYERL9HS&cx=c&gtm=4e64f0	108 ms	42 ms	64 ms
www.criteo.com/wp-content/themes/criteo2017/js/wavegradient.js	72 ms	71 ms	0.2 ms
web.cmp.usercentrics.eu/ui/v/3.114.0/UcGdprCmpView.c071ab9b.js	70 ms	48 ms	8.9 ms

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.

Category	Time Spent
Other	12.6 s
Script Evaluation	5.9 s
Style & Layout	1.2 s
Rendering	809 ms
Script Parsing & Compilation	623 ms
Parse HTML & CSS	201 ms
Garbage Collection	122 ms

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 15.9 KiB

URL	Transfer Size	Est Savings
www.criteo.com/wp-content/themes/criteo2017/js/select2.min.js	45.2 KiB	15.9 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.

URL	Transfer Size
/deliveries/5495f0ebeb224d5a96cede0d56fc5be47b9b11ac.m3u8...	862.6 KiB
www.criteo.com/wp-content/uploads/2025/03/hp-bento-publishers-criteo-demand.svg	597.1 KiB
/deliveries/e247218881161f9e92b5c600918e6d978c5870a2.m3u8...	436.2 KiB
www.criteo.com/wp-content/uploads/2025/03/agencies_efficient-outcomes.svg	404.2 KiB
/deliveries/e247218881161f9e92b5c600918e6d978c5870a2.m3u8...	403.8 KiB
/deliveries/e247218881161f9e92b5c600918e6d978c5870a2.m3u8...	342.0 KiB
/deliveries/e247218881161f9e92b5c600918e6d978c5870a2.m3u8...	315.6 KiB
/deliveries/e247218881161f9e92b5c600918e6d978c5870a2.m3u8...	292.1 KiB
/deliveries/e247218881161f9e92b5c600918e6d978c5870a2.m3u8...	271.5 KiB
/deliveries/e247218881161f9e92b5c600918e6d978c5870a2.m3u8...	256.8 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
div.content-box-wrapp > div.content-box > div.tab-content-image > img `div.content-box-wrapp > div.content-box > div.tab-content-image > img`	www.criteo.com/wp-content/uploads/2025/03/hp-bento-advertisers-retail-media.png
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`	www.criteo.com/wp-content/uploads/2024/01/Represent_Black.png
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`	www.criteo.com/wp-content/uploads/2024/01/Represent_Black.png
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`	www.criteo.com/wp-content/uploads/2024/01/Represent_Black.png
div.content-box-wrapp > div.content-box > div.tab-content-image > img `div.content-box-wrapp > div.content-box > div.tab-content-image > img`	www.criteo.com/wp-content/uploads/2025/03/hp-bento-performance-media-4.svg
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`	www.criteo.com/wp-content/uploads/2026/02/Wine-Country-Logo-250.png
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`	www.criteo.com/wp-content/uploads/2026/02/Wine-Country-Logo-250.png
div.block-wrapper > div.block-inner-wrapper > div.img-wrapper > img.block-image `div.block-wrapper > div.block-inner-wrapper > div.img-wrapper > img.block-image`	www.criteo.com/wp-content/uploads/2025/03/Group-1000004380.svg
div.block-wrapper > div.block-inner-wrapper > div.img-wrapper > img.block-image `div.block-wrapper > div.block-inner-wrapper > div.img-wrapper > img.block-image`	www.criteo.com/wp-content/uploads/2025/03/Frame-1000004615.svg
div.row > div.col-12 > a > img `div.row > div.col-12 > a > img`	tree-nation.com/images/tracking/label-co2-website-white-en.png
div.block-wrapper > div.block-inner-wrapper > div.img-wrapper > img.block-image `div.block-wrapper > div.block-inner-wrapper > div.img-wrapper > img.block-image`	www.criteo.com/wp-content/uploads/2025/03/Group-1000004326.svg
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`	www.criteo.com/wp-content/uploads/2024/05/Patch-Media-ss-logo.png
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`	www.criteo.com/wp-content/uploads/2024/05/Patch-Media-ss-logo.png
div.container > div > div.customers-logos > img `div.container > div > div.customers-logos > img`	www.criteo.com/wp-content/uploads/2025/09/WPP-Media_Wordmark_White.svg
div.content-box-wrapp > div.content-box > div.tab-content-logo > img `div.content-box-wrapp > div.content-box > div.tab-content-logo > img`	www.criteo.com/wp-content/uploads/2025/03/ysl_beauty_logo.svg.svg
div.container > div > div.customers-logos > img `div.container > div > div.customers-logos > img`	www.criteo.com/wp-content/uploads/2025/03/comcast.svg
div.container > div > div.customers-logos > img `div.container > div > div.customers-logos > img`	www.criteo.com/wp-content/uploads/2025/03/deliveroo-1.svg
div.container > div > div.customers-logos > img `div.container > div > div.customers-logos > img`	www.criteo.com/wp-content/uploads/2025/03/shopify-2.svg
div.container > div > div.customers-logos > img `div.container > div > div.customers-logos > img`	www.criteo.com/wp-content/uploads/2025/03/bounding-box.svg
Criteo `div.mobile-left > div.logo > a > img`	www.criteo.com/wp-content/themes/criteo2017/img/criteo-logo-orange.svg
Criteo logo `div.row > div.col-12 > a.d-block > img.footer-logo`	www.criteo.com/wp-content/themes/criteo2017/img/criteo-logo-orange.svg
div.container > div.row > div.customer-story-inner > img.mb-st-6 `div.container > div.row > div.customer-story-inner > img.mb-st-6`	www.criteo.com/wp-content/uploads/2025/03/aventon-seeklogo.com-2.svg
div.container > div > div.customers-logos > img `div.container > div > div.customers-logos > img`	www.criteo.com/wp-content/uploads/2025/03/PG_Logo_SVG.svg
li.nav-item > a.tab > div.icon > img.tab-icon `li.nav-item > a.tab > div.icon > img.tab-icon`	www.criteo.com/wp-content/uploads/2025/03/bento-retailers.svg
li.nav-item > a.tab > div.icon > img.tab-icon `li.nav-item > a.tab > div.icon > img.tab-icon`	www.criteo.com/wp-content/uploads/2025/03/bento-agencies.svg
li.nav-item > a.tab > div.icon > img.tab-icon `li.nav-item > a.tab > div.icon > img.tab-icon`	www.criteo.com/wp-content/uploads/2025/04/hp-advertisers-icon-1.svg
li.nav-item > a.tab > div.icon > img.tab-icon `li.nav-item > a.tab > div.icon > img.tab-icon`	www.criteo.com/wp-content/uploads/2025/03/bento-publishers.svg

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

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●User Timing marks and measures 188 user timings

●Avoid long main-thread tasks 20 long tasks found

●Avoid non-composited animations 129 animated elements found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 100 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 0 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

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

Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn how to match ARIA attributes to their roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Advertisers Increase brand visibility and sales `div.slick-list > div.slick-track > li.nav-item > a.tab`

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Advertisers Increase brand visibility and sales Retailers Control, scale, and m… `div.container > div.content > div.pt-st-4 > ul#mobile-slider-tabs`

ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
By clicking “Accept All Cookies”, you agree to the storing of cookies on your d… `div.cmp-wrapper > div#uc-main-dialog`

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

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body.home > div#page-modular > section#sID-0 > img.hero-bg-grid `body.home > div#page-modular > section#sID-0 > img.hero-bg-grid`
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`
div.row > div.col-12 > a > img `div.row > div.col-12 > a > img`

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.container > div.banner-content > span.banner-right > a `div.container > div.banner-content > span.banner-right > a`
div.header-container > div#global-banner > div.container > a.overlay-link `div.header-container > div#global-banner > div.container > a.overlay-link`
div.slick-list > div.slick-track > div.solution > a.overlay-link `div.slick-list > div.slick-track > div.solution > a.overlay-link`
div.post-wrapper > article#post-417529 > div.background-wrapper > a.article-link `div.post-wrapper > article#post-417529 > div.background-wrapper > a.article-link`
div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link `div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link`
div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link `div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link`
div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link `div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link`
div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link `div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link`
div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link `div.container > div.technologies-wrapper > div.content-box-wrapp > a.overlay-link`
div.row > div.col-12 > div.inner-block > a.overlay-link `div.row > div.col-12 > div.inner-block > a.overlay-link`
div.row > div.col-12 > div.inner-block > a.overlay-link `div.row > div.col-12 > div.inner-block > a.overlay-link`
div.row > div.col-12 > div.inner-block > a.overlay-link `div.row > div.col-12 > div.inner-block > a.overlay-link`
div.col-12 > div.social-links > div.social-icons > a `div.col-12 > div.social-links > div.social-icons > a`
div.col-12 > div.social-links > div.social-icons > a `div.col-12 > div.social-links > div.social-icons > a`
div.col-12 > div.social-links > div.social-icons > a `div.col-12 > div.social-links > div.social-icons > a`
div.col-12 > div.social-links > div.social-icons > a `div.col-12 > div.social-links > div.social-icons > a`
div.row > div.col-12 > div > a.d-block `div.row > div.col-12 > div > a.d-block`
div.container > div.row > div.col-12 > a `div.container > div.row > div.col-12 > a`

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 require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Advertisers Increase brand visibility and sales `ul#mobile-slider-tabs > div.slick-list > div.slick-track > li.nav-item`
Success Stories `div.col-12 > div.footer-menu > ul.mt-4 > li`
Agencies `div.col-12 > div.footer-menu > ul.mt-4 > li`
Marketplace Performance Outcome `div.col-12 > div.footer-menu > ul.mt-4 > li`
Partners `div.col-12 > div.footer-menu > ul.mt-4 > li`
Privacy Policy `div.col-12 > div.footer-menu > ul.mt-4 > li`
CCPA Privacy Policy `div.col-12 > div.footer-menu > ul.mt-4 > li`
Website Privacy Policy `div.col-12 > div.footer-menu > ul.mt-4 > li`
Do Not Sell or Share My Personal Information `div.col-12 > div.footer-menu > ul.mt-4 > li`
Cookie Management `div.col-12 > div.footer-menu > ul.mt-4 > li`
Privacy Guidelines for Clients and Publisher Partners `div.col-12 > div.footer-menu > ul.mt-4 > li`
Trust Center `div.col-12 > div.footer-menu > ul.mt-4 > li`
Security `div.col-12 > div.footer-menu > ul.mt-4 > li`
Reports & Research `div.col-12 > div.footer-menu > ul.mt-4 > li`
Blog `div.col-12 > div.footer-menu > ul.mt-4 > li`
Webinars `div.col-12 > div.footer-menu > ul.mt-4 > li`
Events `div.col-12 > div.footer-menu > ul.mt-4 > li`
Developers `div.col-12 > div.footer-menu > ul.mt-4 > li`
Terms and Conditions `div.col-12 > div.footer-menu > ul.mt-4 > li`
Legal Mentions `div.col-12 > div.footer-menu > ul.mt-4 > li`
Supply Partner Guidelines `div.col-12 > div.footer-menu > ul.mt-4 > li`
Advertising Guidelines `div.col-12 > div.footer-menu > ul.mt-4 > li`
Supported Platforms `div.col-12 > div.footer-menu > ul.mt-4 > li`
UK Modern Slavery Act `div.col-12 > div.footer-menu > ul.mt-4 > li`
Tax Strategy `div.col-12 > div.footer-menu > ul.mt-4 > li`
Careers `div.col-12 > div.footer-menu > ul.mt-4 > li`
Company `div.col-12 > div.footer-menu > ul.mt-4 > li`
Investors `div.col-12 > div.footer-menu > ul.mt-4 > li`
In the News `div.col-12 > div.footer-menu > ul.mt-4 > li`
Sustainability `div.col-12 > div.footer-menu > ul.mt-4 > li`
Diversity, Equity & Inclusion `div.col-12 > div.footer-menu > ul.mt-4 > li`
Contact Us `div.col-12 > div.footer-menu > ul.mt-4 > li`
Office Locations `div.col-12 > div.footer-menu > ul.mt-4 > li`
Retail Media `div.col-12 > div.footer-menu > ul.mt-4 > li`
Retargeting `div.col-12 > div.footer-menu > ul.mt-4 > li`
Customer Acquisition `div.col-12 > div.footer-menu > ul.mt-4 > li`
Display Advertising `div.col-12 > div.footer-menu > ul.mt-4 > li`
Customer Targeting `div.col-12 > div.footer-menu > ul.mt-4 > li`

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

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

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>`

●`[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

●`button`, `link`, and `menuitem` elements have accessible names

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●`<video>` elements contain a `<track>` element with `[kind="captions"]`

●All heading elements contain content.

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○`[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

○Form elements have associated labels

○Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

○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>`.

○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.

Best Practices

User Experience

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
div.row > div.quote-wrapper > div.quote_author > img.mr-st-6 `div.row > div.quote-wrapper > div.quote_author > img.mr-st-6`	www.criteo.com/wp-content/uploads/2025/03/Adele-Nasr-Headshot.jpg	64 x 64 (1.00)	1086 x 974 (1.11)

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.

Source	Description
www.criteo.com/	`Access to XMLHttpRequest at 'https://tree-nation.com/track/web/195755' from origin 'https://www.criteo.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
tree-nation.com/track/web/195755	`Failed to load resource: net::ERR_FAILED`

●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

●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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

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.

Link destination	Link Text
www.criteo.com/technology/product-recommendations/	Learn more
www.criteo.com/technology/commerce-ai/	Learn more
www.criteo.com/technology/predictive-bidding/	Learn more
www.criteo.com/technology/shopper-graph/	Learn more
www.criteo.com/technology/dco/	Learn more
www.criteo.com/go/	Learn more

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body.home > div#page-modular > section#sID-0 > img.hero-bg-grid `body.home > div#page-modular > section#sID-0 > img.hero-bg-grid`
div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide `div.background-wrapper-inner > div.post-inner > div.post-logo > img.logo-slide`
div.row > div.col-12 > a > img `div.row > div.col-12 > a > img`

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

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
Platform … `div.mobile-mega-menu > ul#mobile-menu > li.main-menu-item > a.main-menu-item-link`
Solutions … `div.mobile-mega-menu > ul#mobile-menu > li.main-menu-item > a.main-menu-item-link`
Capabilities … `div.mobile-mega-menu > ul#mobile-menu > li.main-menu-item > a.main-menu-item-link`
Resources … `div.mobile-mega-menu > ul#mobile-menu > li.main-menu-item > a.main-menu-item-link`
About … `div.mobile-mega-menu > ul#mobile-menu > li.main-menu-item > a.main-menu-item-link`

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`