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

Audit breakdown by category with detailed findings.

84

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
www.guinnessworldrecords.com/images/london-venue-homepage-banner.png0.0 ms578.1 KiB
www.guinnessworldrecords.com/images/b2b-online-records-banner.jpg0.0 ms321.6 KiB
www.guinnessworldrecords.com/news/2026/4/images/love-locks-thumbnail.png0.0 ms200.8 KiB
/products/images/largest-loop-the-loop-in-a-car-for-tile.jpg0.0 ms196.3 KiB
www.guinnessworldrecords.com/news/2026/4/images/oldest-rabbit-new-thumbnail.jpg0.0 ms192.7 KiB
/products/images/banner-with-gwr2026-homepage-1900x650.jpg0.0 ms189.0 KiB
/products/images/tile-for-record-selector-homepage.jpg0.0 ms186.8 KiB
/news/2026/4/images/most-marvel-tattoos-thumbnail.jpg0.0 ms184.8 KiB
www.guinnessworldrecords.com/images/dr-howard-carousel.jpg0.0 ms147.0 KiB
www.guinnessworldrecords.com/news/2026/4/images/stilts-24hr-thumbnail.jpg0.0 ms141.4 KiB
www.guinnessworldrecords.com/news/2026/4/images/strongest-bodypart-thumbnail.png0.0 ms133.7 KiB
/news/2026/4/images/stelarc-ear-on-arm-header-image.jpg0.0 ms123.7 KiB
www.guinnessworldrecords.com/news/2026/4/images/phm-lego-header-image.jpg0.0 ms120.5 KiB
www.guinnessworldrecords.com/images/gwr-studios.jpg0.0 ms95.5 KiB
www.guinnessworldrecords.com/images/marathon-runner-group-home.jpg0.0 ms91.7 KiB
www.ezojs.com/identity.js900.0 s101.7 KiB
/products/images/view-our-case-studies-with-certificate-a...0.0 ms88.2 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
/images/guinness-world-records-kids-logo-on-purple-backgr...0.0 ms71.9 KiB
www.guinnessworldrecords.com/images/employee-engagement-home.jpg0.0 ms62.0 KiB
www.ezojs.com/ezoic/sa.min.js600.0 s65.8 KiB
sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.js0.0 ms60.3 KiB
www.guinnessworldrecords.com/images/logo.png0.0 ms56.6 KiB
go.ezodn.com/ezoic/ezorca.min.js14400.0 s74.0 KiB
/signals/config/1034594633413716?v=2.9.303&r=stable&domai...1200.0 s44.4 KiB
www.guinnessworldrecords.com/js/scripts.min.js0.0 ms33.4 KiB
www.guinnessworldrecords.com/images/css/loading.gif0.0 ms30.8 KiB
www.guinnessworldrecords.com/js/jquery.js0.0 ms30.0 KiB
www.guinnessworldrecords.com/css/fonts/gwr.ttf0.0 ms29.4 KiB
www.guinnessworldrecords.com/css/main.min.css0.0 ms28.5 KiB
www.guinnessworldrecords.com/css/fonts/rubik/rubik-medium-webfont.woff20.0 ms27.5 KiB
www.guinnessworldrecords.com/css/fonts/rubik/rubik-regular-webfont.woff20.0 ms27.3 KiB
www.guinnessworldrecords.com/images/og_image.jpg0.0 ms18.6 KiB
www.guinnessworldrecords.com/images/css/gwr_kids_link.jpg0.0 ms16.4 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
ssl.pstatic.net/melona/libs/gfp-nac-module/synchronizer.js2204.0 s18.2 KiB
wcs.naver.net/wcslog.js60.0 s10.5 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
www.guinnessworldrecords.com/images/footer-strapline.png0.0 ms4.7 KiB
the.gatekeeperconsent.com/cmp.min.js300.0 s3.0 KiB
www.guinnessworldrecords.com/scripts.js0.0 ms2.2 KiB
cmp.gatekeeperconsent.com/min.js0.0 ms855 B
/collect?v=2&fmt=js&pid=8785889&time=1776804644183&url=ht...0.0 ms695 B
go.ezodn.com/ezoicanalytics.js?cb=1&dcb=195-42&shcb=3486400.0 s1.5 KiB
/tr/?id=1034594633413716&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms16 B

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:1.519 source:map[column:30333 line:2 type:source-location url:https://www.guinnessworldrecords.com/js/jquery.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:11.988 source:map[type:text value:[unattributed]]] map[reflowTime:5.445 source:map[column:51681 line:1 type:source-location url:https://www.guinnessworldrecords.com/js/jquery.js urlProvider:network]] map[reflowTime:9.765 source:map[column:52357 line:1 type:source-location url:https://www.guinnessworldrecords.com/js/jquery.js urlProvider:network]] map[reflowTime:0.308 source:map[column:52415 line:1 type:source-location url:https://www.guinnessworldrecords.com/js/jquery.js urlProvider:network]] map[reflowTime:0.162 source:map[column:52479 line:1 type:source-location url:https://www.guinnessworldrecords.com/js/jquery.js urlProvider:network]] map[reflowTime:0.447 source:map[column:51703 line:1 type:source-location url:https://www.guinnessworldrecords.com/js/jquery.js urlProvider:network]] map[reflowTime:0.226 source:map[column:53392 line:1 type:source-location url:https://www.guinnessworldrecords.com/js/jquery.js urlProvider:network]] map[reflowTime:0.212 source:map[column:22968 line:3 type:source-location url:https://www.guinnessworldrecords.com/js/scripts.min.js urlProvider:network]] map[reflowTime:0.317 source:map[column:87613 line:1 type:source-location url:https://www.guinnessworldrecords.com/js/jquery.js urlProvider:network]] map[reflowTime:1.085 source:map[column:23446 line:10 type:source-location url:https://sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.js urlProvider:network]] map[reflowTime:0.232 source:map[column:23788 line:10 type:source-location url:https://sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.js urlProvider:network]] map[reflowTime:0.123 source:map[column:1222 line:0 type:source-location url:https://wcs.naver.net/wcslog.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
Guinness World Records Announces First Permanent UK Attraction - image of The O… div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
www.guinnessworldrecords.com/images/london-venue-homepage-banner.png577.0 KiB475.6 KiB
Explore creative campaigns – image of a car performing a loop-the-loop article > a > div.columned-image > img.lazy
/products/images/largest-loop-the-loop-in-a-car-for-tile.jpg195.6 KiB187.8 KiB
Record selector screenshot article > a > div.columned-image > img.lazy
/products/images/tile-for-record-selector-homepage.jpg186.1 KiB171.4 KiB
Pont-des-Arts with love-locks on the railing a > article.news-item > figure > img
www.guinnessworldrecords.com/news/2026/4/images/love-locks-thumbnail.png200.2 KiB169.5 KiB
Herbie the rabbit then and now a > article.news-item > figure > img
www.guinnessworldrecords.com/news/2026/4/images/oldest-rabbit-new-thumbnail.jpg192.0 KiB167.0 KiB
split image of Tom with certificate and some of his tattoos a > article.news-item > figure > img
/news/2026/4/images/most-marvel-tattoos-thumbnail.jpg184.1 KiB159.0 KiB
GWR for Business We’re on a mission to show off your brilliant brand, and your… body.en > main#main > section.component-wrapper
www.guinnessworldrecords.com/images/b2b-online-records-banner.jpg320.8 KiB135.2 KiB
Split image of Saimaiti Yiming walking in his stilts and at the ceremony a > article.news-item > figure > img
www.guinnessworldrecords.com/news/2026/4/images/stilts-24hr-thumbnail.jpg140.8 KiB115.7 KiB
Split image of a man lifting weight with his tongue; another man lifting weight… a > article.news-item > figure > img
www.guinnessworldrecords.com/news/2026/4/images/strongest-bodypart-thumbnail.png133.1 KiB108.1 KiB
GWR-Store div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
/products/images/banner-with-gwr2026-homepage-1900x650.jpg188.3 KiB93.2 KiB
The LEGO display in front of planet Earth a > article.news-item > figure > img
www.guinnessworldrecords.com/news/2026/4/images/phm-lego-header-image.jpg119.9 KiB89.2 KiB
Explore GWR Studios - record breaker taking photograph article > a > div.columned-image > img.lazy
www.guinnessworldrecords.com/images/gwr-studios.jpg95.0 KiB87.2 KiB
Explore case studies - group of record breakers with certificate article > a > div.columned-image > img.lazy
/products/images/view-our-case-studies-with-certificate-a...87.7 KiB79.8 KiB
Marathon runner group article > a > div.columned-image > img.lazy
www.guinnessworldrecords.com/images/marathon-runner-group-home.jpg91.1 KiB76.3 KiB
banner for news story div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
www.guinnessworldrecords.com/images/dr-howard-carousel.jpg146.4 KiB72.5 KiB
Stelarc showing off the ear on his arm a > article.news-item > figure > img
/news/2026/4/images/stelarc-ear-on-arm-header-image.jpg123.1 KiB66.7 KiB
Guinness World Records Kids logo article > a > div.columned-image > img.lazy
/images/guinness-world-records-kids-logo-on-purple-backgr...71.4 KiB56.6 KiB
Explore Employee engagement - group gathering article > a > div.columned-image > img.lazy
www.guinnessworldrecords.com/images/employee-engagement-home.jpg61.5 KiB53.7 KiB
Guinness World Records Navy Beanie- div.shopify-buy__collection-products > div.has-image > div.shopify-buy__product-img-wrapper > img.shopify-buy__product__variant-img
/s/files/1/0570/8388/7782/files/guinness-world-records-na...34.4 KiB31.0 KiB
Black Cap div.shopify-buy__collection-products > div.has-image > div.shopify-buy__product-img-wrapper > img.shopify-buy__product__variant-img
/s/files/1/0570/8388/7782/files/Black_Cap_Packshots_1_550...25.0 KiB22.0 KiB
Guinness World Records header#header > div.logo > a > img
www.guinnessworldrecords.com/images/og_image.jpg18.1 KiB17.4 KiB
Guinness World Records Aluminium Water Bottle-Silver div.shopify-buy__collection-products > div.has-image > div.shopify-buy__product-img-wrapper > img.shopify-buy__product__variant-img
/s/files/1/0570/8388/7782/files/Water_Bottle_1_6f4f2ce2-d...13.3 KiB11.7 KiB
Guinness World Records Ceramic Mug-White div.shopify-buy__collection-products > div.has-image > div.shopify-buy__product-img-wrapper > img.shopify-buy__product__variant-img
/s/files/1/0570/8388/7782/files/Guinness-World-_Records-O...10.8 KiB9.5 KiB

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-19-IMG
nodeLabel: banner for news story
path: 2,HTML,1,BODY,2,MAIN,2,SECTION,0,DIV,1,DIV,0,DIV,1,DIV,0,A,0,IMG
selector: div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
snippet: <img class="lazy" src="/images/dr-howard-carousel.jpg" alt="banner for news story" data-srcd="/images/dr-howard-carousel.jpg" data-srct="/images/dr-howard-carousel.jpg" data-srcm="/images/dr-howard-carousel.jpg">

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
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.

URLTransfer SizeDuration
www.guinnessworldrecords.com/css/main.min.css28.5 KiB81 ms

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.

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

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: 556 ms

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.

Estimated savings: 30 ms 23.9 KiB
URLTransfer SizeEst Savings
www.guinnessworldrecords.com/css/main.min.css28.0 KiB23.9 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.

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
The page has an unload handler in the main frame.Actionable

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
GWR-Store div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
/products/images/banner-with-gwr2026-homepage-1900x650.jpg
banner for news story div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
www.guinnessworldrecords.com/images/dr-howard-carousel.jpg
Guinness World Records Announces First Permanent UK Attraction - image of The O… div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
www.guinnessworldrecords.com/images/london-venue-homepage-banner.png
GWR-Store div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
/products/images/banner-with-gwr2026-homepage-1900x650.jpg
banner for news story div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
www.guinnessworldrecords.com/images/dr-howard-carousel.jpg
Guinness World Records Announces First Permanent UK Attraction - image of The O… div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
www.guinnessworldrecords.com/images/london-venue-homepage-banner.png
GWR-Store div.slick-track > div.slider-holder > a.slider-holder-link > img.lazy
/products/images/banner-with-gwr2026-homepage-1900x650.jpg
Explore creative campaigns – image of a car performing a loop-the-loop article > a > div.columned-image > img.lazy
/products/images/largest-loop-the-loop-in-a-car-for-tile.jpg
Explore Employee engagement - group gathering article > a > div.columned-image > img.lazy
www.guinnessworldrecords.com/images/employee-engagement-home.jpg
Explore GWR Studios - record breaker taking photograph article > a > div.columned-image > img.lazy
www.guinnessworldrecords.com/images/gwr-studios.jpg
Explore case studies - group of record breakers with certificate article > a > div.columned-image > img.lazy
/products/images/view-our-case-studies-with-certificate-a...
Guinness World Records Kids logo article > a > div.columned-image > img.lazy
/images/guinness-world-records-kids-logo-on-purple-backgr...
Marathon runner group article > a > div.columned-image > img.lazy
www.guinnessworldrecords.com/images/marathon-runner-group-home.jpg
Record selector screenshot article > a > div.columned-image > img.lazy
/products/images/tile-for-record-selector-homepage.jpg
Guinness World Records div.logo_main > div.logo > a > img
www.guinnessworldrecords.com/images/logo.png
Guinness World Records header#header > div.logo > a > img
www.guinnessworldrecords.com/images/og_image.jpg

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

Max Potential First Input Delay 80 ms
Layout shift culprits
Optimize DOM size
Font display
LCP breakdown
Modern HTTP
Optimize viewport for mobile
Minify CSS
Minify JavaScript
User Timing marks and measures 5 user timings
JavaScript execution time 0.4 s
Minimizes main-thread work 1.1 s
Avoid long main-thread tasks 2 long tasks found
Network Requests
Network Round Trip Times 290 ms
Server Backend Latencies 160 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Initial server response time was short Root document took 40 ms
Avoid large layout shifts 1 layout shift found
INP breakdown
Avoid non-composited animations
95

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
EN div.menu > div.nav-links > a#globe > span.two-letter-iso-code
Are you ear-ing this? Australian artist surgically implanted an extra ear on to… a > article.news-item > header > h3
How a Paris bridge nearly collapsed under 45 tonnes of love a > article.news-item > header > h3
Lucky rabbit Herbie becomes oldest of his species after doubling life expectancy a > article.news-item > header > h3
What is the strongest part of the human body? These records might surprise you! a > article.news-item > header > h3
Marvel obsessive breaks record by covering body in over 60 tattoos of iconic ch… a > article.news-item > header > h3
These stilts were made for walkin’: Chinese man travelled 50 miles in sky-high … a > article.news-item > header > h3
Bricks and spaceships: a ‘Project Hail Mary’ LEGO minifig has made it to space a > article.news-item > header > h3
More news section.component-wrapper > div.container > div.fullwidth-cta-holder > a.btn
Creative campaigns a > div.columned-text > div.container > h4.columned-text-title
Employee engagement a > div.columned-text > div.container > h4.columned-text-title
GWR Studios a > div.columned-text > div.container > h4.columned-text-title
View our case studies a > div.columned-text > div.container > h4.columned-text-title
Visit business solutions section.component-wrapper > div.container > div.cta-holder > a.btn
Shop Now section.component-wrapper > div.container > div.fullwidth-cta-holder > a.btn
USING THIS SITE footer#footer > div.container > section.footer-section > h5
CONTACT US footer#footer > div.container > section.footer-section > h5

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
Creative campaigns a > div.columned-text > div.container > h4.columned-text-title
Guinness World Records Kids a > div.columned-text > div.container > h4.columned-text-title

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
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.
ARIA attributes are used as specified for the element's role
Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
`[aria-hidden="true"]` elements do not contain focusable descendents
Elements use only permitted ARIA attributes
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 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
All heading elements contain content.
Identical links have the same purpose.
Elements with visible text labels have matching accessible names.
`[accesskey]` values are unique
`button`, `link`, and `menuitem` elements 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
`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
`<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
`<video>` elements contain a `<track>` element with `[kind="captions"]`
Tables have different content in the summary attribute and `<caption>`.
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.
81

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
AttributionReporting
Unload event listeners are deprecated and will be removed.
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 browser errors logged to the console
No issues in the `Issues` panel in Chrome Devtools
Ensure CSP is effective against XSS attacks
Use a strong HSTS policy
Ensure proper origin isolation with COOP
Mitigate 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
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SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

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
Vendor List div#ez-cookie-dialog-wrapper > div#ez-cookie-dialog > div#secondary-links > a#ez-vendors

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

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