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.

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
www.nobelprize.org/uploads/2025/08/default-3-scaled.jpg	604800.0 s	878.3 KiB
i.ytimg.com/vi/pUIp0zNG7Ro/sddefault.jpg	7200.0 s	66.7 KiB
cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js	86400.0 s	110.6 KiB
i.ytimg.com/vi_webp/Ihq2nIne9-Q/sddefault.webp	7200.0 s	21.1 KiB
cdn.cookielaw.org/logos/static/ot_company_logo.png	86400.0 s	19.1 KiB
static.hotjar.com/c/hotjar-1004842.js?sv=7	60.0 s	6.2 KiB
/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredS...	604800.0 s	38.3 KiB
/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredS...	604800.0 s	36.6 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
/wp-content/themes/nobelprize/dist/css/frontend.css?ver=1...	604800.0 s	35.0 KiB
www.nobelprize.org/wp-content/themes/nobelprize/assets/images/spinner.gif	604800.0 s	31.7 KiB
www.nobelprize.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	604800.0 s	30.2 KiB
/wp-content/plugins/nobelprize/assets/js/admin/lib/flicki...	604800.0 s	27.1 KiB
/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredS...	604800.0 s	24.5 KiB
/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredS...	604800.0 s	24.1 KiB
/wp-content/themes/nobelprize/dist/js/535.9356935a511d8ee...	604800.0 s	13.0 KiB
cdn.cookielaw.org/consent/d75760b8-7732-445e-9a87-2de3e237d0fe/OtAutoBlock.js	86400.0 s	3.0 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg	86400.0 s	2.6 KiB
/wp-content/themes/nobelprize/dist/js/frontend.js?ver=177...	604800.0 s	10.0 KiB
www.nobelprize.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1	604800.0 s	5.1 KiB
static.doubleclick.net/instream/ad_status.js	900.0 s	495 B
/wp-content/themes/nobelprize/assets/js/frontend/lib/lazy...	604800.0 s	3.4 KiB
/wp-content/themes/nobelprize/dist/js/523.eba09e8a9e8cc8c...	604800.0 s	1.7 KiB
/wp-content/themes/nobelprize/assets/js/frontend/lib/clam...	604800.0 s	1.5 KiB
/wp-content/themes/nobelprize/assets/js/frontend/lib/bgse...	604800.0 s	1.4 KiB
/wp-content/plugins/nobelprize-block-library/dist/js/fron...	604800.0 s	1.4 KiB
/wp-content/themes/nobelprize/assets/js/frontend/lib/obje...	604800.0 s	1.3 KiB
www.nobelprize.org/wp-content/themes/nobelprize/dist/523.css	604800.0 s	1023 B
/wp-content/plugins/nobelprize-block-library/dist/css/fro...	604800.0 s	696 B
/wp-content/themes/nobelprize/dist/js/736.902b2b0b76c2b6a...	604800.0 s	554 B
/wp-content/themes/nobelprize/assets/js/frontend/lib/load...	604800.0 s	488 B
static.doubleclick.net/instream/ad_status.js	900.0 s	0 B

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
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	70 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	10 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:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:12.507 source:map[column:8495 line:5 type:source-location url:https://www.nobelprize.org/ 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:7.685 source:map[column:262025 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:0.131 source:map[column:262369 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:0.44 source:map[column:40017 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:4.251 source:map[column:149729 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:2.833 source:map[column:3466 line:1 type:source-location url:https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/lazysizes/lazysizes.min.js?ver=1775554447 urlProvider:network]] map[reflowTime:11.835 source:map[type:text value:[unattributed]]] map[reflowTime:0.257 source:map[column:55 line:800 type:source-location url:https://www.googletagmanager.com/gtag/js?id=G-MY66JBWQGX&cx=c&gtm=4e64h1 urlProvider:network]]]

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-DIV

nodeLabel: main#content > div.nobel__blocks--content > section.page-hero > div.bg

path: 1,HTML,1,BODY,6,MAIN,0,DIV,0,SECTION,0,DIV

selector: main#content > div.nobel__blocks--content > section.page-hero > div.bg

snippet: <div class="bg hero lazyloaded" data-bgset="https://www.nobelprize.org/uploads/2025/08/default-3-scaled.jpg [(max-widt…" style="background-image: url("https://www.nobelprize.org/uploads/2025/08/default-…");">

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.

URL	Transfer Size	Duration
cdn.cookielaw.org/consent/d75760b8-7732-445e-9a87-2de3e237d0fe/OtAutoBlock.js	3.0 KiB	767 ms
cdn.cookielaw.org/scripttemplates/otSDKStub.js	9.1 KiB	151 ms
/wp-content/themes/nobelprize/assets/js/frontend/lib/load...	488 B	464 ms
/wp-content/themes/nobelprize/dist/css/frontend.css?ver=1...	35.0 KiB	916 ms
/wp-content/plugins/nobelprize-block-library/dist/css/fro...	696 B	163 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.

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
main#content > div.nobel__blocks--content > section.page-hero > div.bg `main#content > div.nobel__blocks--content > section.page-hero > div.bg`	www.nobelprize.org/uploads/2025/08/default-3-scaled.jpg	877.5 KiB	23.4 KiB

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: 803 ms

URL	Time Spent
nobelprize.org/	803 ms
www.nobelprize.org/	0.0 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

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 80 ms 10.2 KiB

URL	Transfer Size	Est Savings
/wp-content/plugins/nobelprize/assets/js/admin/lib/flicki...	26.8 KiB	10.2 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 80 ms 47.4 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/nobelprize/dist/css/frontend.css?ver=1...	34.7 KiB	28.6 KiB
	21.1 KiB	18.8 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: 450 ms 242.2 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-MY66JBWQGX&cx=c&gtm=4e64h1	156.4 KiB	62.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-WDHZ8W5	135.7 KiB	61.7 KiB
cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js	110.3 KiB	59.7 KiB
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	56.1 KiB	37.8 KiB
www.nobelprize.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	29.9 KiB	20.7 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
www.nobelprize.org/	1.2 s	191 ms	36 ms
Unattributable	493 ms	70 ms	0.0 ms
cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js	431 ms	276 ms	72 ms
www.googletagmanager.com/gtag/js?id=G-MY66JBWQGX&cx=c&gtm=4e64h1	362 ms	296 ms	60 ms
www.googletagmanager.com/gtm.js?id=GTM-WDHZ8W5	361 ms	278 ms	78 ms
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	214 ms	179 ms	30 ms
js-agent.newrelic.com/nr-spa-1.313.1.min.js	193 ms	159 ms	15 ms
/wp-content/themes/nobelprize/assets/js/frontend/lib/lazy...	99 ms	53 ms	1.3 ms
cdn.cookielaw.org/scripttemplates/otSDKStub.js	58 ms	42 ms	3.7 ms
www.nobelprize.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	52 ms	39 ms	11 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
Script Evaluation	1.7 s
Other	664 ms
Style & Layout	591 ms
Script Parsing & Compilation	344 ms
Rendering	199 ms
Parse HTML & CSS	147 ms
Garbage Collection	46 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
Pages with cache-control:no-store header cannot enter back/forward cache.	Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.	Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.	Not actionable

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
www.nobelprize.org/uploads/2025/08/default-3-scaled.jpg	878.3 KiB
www.youtube.com/s/player/218d9d92/player_embed_es6.vflset/en_US/base.js	435.8 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021...	193.1 KiB
www.googletagmanager.com/gtag/js?id=G-MY66JBWQGX&cx=c&gtm=4e64h1	156.4 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021...	146.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-WDHZ8W5	136.1 KiB
cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js	110.6 KiB
i.ytimg.com/vi/pUIp0zNG7Ro/sddefault.jpg	66.7 KiB
www.youtube.com/s/player/218d9d92/www-player.css	56.9 KiB
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	56.6 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
Kailash Satyarthi and the 2014 Nobel Laureates during his visit to the Nobel Fo… `div.laureates-birthday__content > figure.laureates-birthday__image > picture > img.lazyload`	data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
A half-open door `figure.featuredimage > a > picture > img.lazyload`	data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
View from the water along the quay. `figure.featuredimage > a > picture > img.lazyload`	data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
J. Michael Bishop `figure.featuredimage > a > picture > img.lazyload`	data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
Christopher A. Sims `figure.featuredimage > a > picture > img.lazyload`	data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
Anthony J. Leggett `figure.featuredimage > a > picture > img.lazyload`	data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
Louis E. Brus `figure.featuredimage > a > picture > img.lazyload`	data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==

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 5 user timings

●Avoid long main-thread tasks 15 long tasks found

●Avoid non-composited animations 1 animated element found

●Network Requests

●Network Round Trip Times 60 ms

●Server Backend Latencies 250 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 20 ms

●Avoid large layout shifts 12 layout shifts 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.

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
What would you ask a Nobel Prize laureate? `div.nobel__blocks--content > section.article-grid > header.section-header > h2.section-header-h3`
Enter `div.laureates-birthday__text > form.laureates-birthday__form > div.laureates-birthday__input-group > button.btn`
What’s on `section.queried-content-block > div.container > header.block-separator > h2.block-separator__title`
Learn more `section.page-hero > div.blurb > div.hero-btn-wrapper > a.hero-btn`
See all crash courses `div.content-wrapper > div.text > p > a`
Watch Nobel Minds 2025 `section.page-hero > div.blurb > div.hero-btn-wrapper > a.hero-btn`
Get involved `div.nobel__blocks--content > section.social-media-block > header.block-separator > h2.block-separator__title`
Connect with us `div.nobel__blocks--content > section.social > header.section-header > h2.section-header-h3`
privacy policy `form > label.newsletterconfirm > p > a`
Play and learn `section.queried-content-block > div.container > header.block-separator > h2.block-separator__title`
In memoriam `div.nobel__blocks--content > section.article-grid > header.section-header > h2.section-header-h3`
Biography `div.content-wrapper > div.text > p > a`
Biography `div.content-wrapper > div.text > p > a`
Biography `div.content-wrapper > div.text > p > a`
Biography `div.content-wrapper > div.text > p > a`
NOBEL PRIZE `section.colophon > div.footer-logo > p.site-logo > a`
Copyright © Nobel Prize Outreach 2026 `footer.site-footer > div.container > section.colophon > div.copyright`
Cookies settings `div.ot-sdk-row > div#onetrust-button-group-parent > div#onetrust-button-group > button#onetrust-pc-btn-handler`
Accept all cookies `div.ot-sdk-row > div#onetrust-button-group-parent > div#onetrust-button-group > button#onetrust-accept-btn-handler`

These are opportunities to improve the legibility of your content.

Names and labels

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
figure.wp-block-embed > div.wp-block-embed__wrapper > div.iframe > iframe `figure.wp-block-embed > div.wp-block-embed__wrapper > div.iframe > iframe`
figure.wp-block-embed > div.wp-block-embed__wrapper > div.iframe > iframe `figure.wp-block-embed > div.wp-block-embed__wrapper > div.iframe > iframe`

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.

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
A home for the unique legacy of Alfred Nobel `div.content-wrapper > header.content > div.title > h3.headline`
One-minute crash course `div.content-wrapper > header.content > div.title > h3.headline`
Explore prizes and laureates `div.nobel__blocks--content > section.explore-laureates > header.section-header > h3`

These are opportunities to improve keyboard navigation in your application.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Enter `div.laureates-birthday__text > form.laureates-birthday__form > div.laureates-birthday__input-group > button.btn`
Our cookie policy. `div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text > a.ot-cookie-policy-link`

○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 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.

●Select elements have associated label elements.

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

●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

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

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

●Links are distinguishable without relying on color.

●Links have a discernible name

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

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

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

●Touch targets have sufficient size and spacing.

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●All heading elements contain content.

●Identical links have the same purpose.

○`[accesskey]` values are unique

○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

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○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.

100

Best Practices

●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 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

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.nobelprize.org/microscopes/	Read more
www.nobelprize.org/stories/microwaves/	Learn more
cookiepedia.co.uk/giving-consent-to-cookies	More information

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
nav#main-navigation-js > ul#menu-header_top > li#menu-item-28259 > a.menu-item-link `nav#main-navigation-js > ul#menu-header_top > li#menu-item-28259 > a.menu-item-link`
nav#main-navigation-js > ul#menu-header_top > li#menu-item-28260 > a.menu-item-link `nav#main-navigation-js > ul#menu-header_top > li#menu-item-28260 > a.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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`