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.gatesnotes.com/_next/static/chunks/841-c303c864c87f260e.js	1200.0 s	169.0 KiB
www.gatesnotes.com/_next/static/chunks/pages/_app-ee22985bcf0d42fe.js	1200.0 s	109.8 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
www.gatesnotes.com/_next/static/chunks/590-a960c64a2992861d.js	1200.0 s	84.7 KiB
www.gatesnotes.com/_next/static/chunks/fb7d5399-99e317269aa82b77.js	1200.0 s	74.7 KiB
www.gatesnotes.com/_next/static/chunks/2d36dd80-04e56ed63fd78439.js	1200.0 s	58.2 KiB
www.gatesnotes.com/_next/static/css/2f3808217b871ef5.css	1200.0 s	47.1 KiB
/signals/config/1984876168258538?v=2.9.303&r=stable&domai...	1200.0 s	44.9 KiB
www.gatesnotes.com/_next/static/chunks/framework-d7eda8d01813ccd9.js	1200.0 s	44.8 KiB
www.gatesnotes.com/_next/static/chunks/4d99978a-d87e2051138f2be0.js	1200.0 s	28.4 KiB
www.gatesnotes.com/_next/static/chunks/main-d2a793b6dc23a82a.js	1200.0 s	25.5 KiB
assets.adobedtm.com/ee4236cad46a/017c9210d029/launch-d9135d6ecfbf.min.js	3600.0 s	25.4 KiB
www.redditstatic.com/ads/pixel.js	60.0 s	19.0 KiB
b-code.liadm.com/a-05yv.min.js	86400.0 s	46.1 KiB
www.gatesnotes.com/_next/static/chunks/94726e6d-7fc96c7c24f65974.js	1200.0 s	19.8 KiB
www.gatesnotes.com/_next/static/chunks/75fc9c18-5e77fd7fffcc90d0.js	1200.0 s	18.7 KiB
amplify.outbrain.com/cp/obtp.js	1200.0 s	18.3 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
www.gatesnotes.com/_next/static/chunks/09732f6b-70260616acae932f.js	1200.0 s	16.6 KiB
scripts.clarity.ms/0.8.59/clarity.js	86400.0 s	26.2 KiB
www.gatesnotes.com/_next/static/css/cd4d9b35cecc1d8c.css	1200.0 s	11.0 KiB
tags.srv.stackadapt.com/events.js	5.0 s	7.7 KiB
snap.licdn.com/li.lms-analytics/insight.min.js	86400.0 s	18.7 KiB
www.gatesnotes.com/_next/static/chunks/webpack-8f05ab4991ace8c7.js	1200.0 s	2.2 KiB
www.google-analytics.com/plugins/ua/linkid.js	3600.0 s	995 B
www.gatesnotes.com/_next/static/a5I8CDVgT5ZgQAIvjZQO1/_buildManifest.js	1200.0 s	810 B
/ee4236cad46a/017c9210d029/8f75704f705e/RC0c3ee17110ed4a6...	3600.0 s	891 B
/rp.gif?ts=1776896309794&id=t2_a282fk7r&event=PageVisit&m...	0.0 ms	666 B
www.gatesnotes.com/_next/static/chunks/pages/index-4296506c4ac94a6c.js	1200.0 s	687 B
www.gatesnotes.com/js/GTM_H_P.js	1200.0 s	636 B
wave.outbrain.com/mtWavesBundler/handler/00532d9f645135488ac8aa9dd97a44b30c	60.0 s	539 B
/collect?v=2&fmt=js&pid=2366844&time=1776896309902&li_ads...	0.0 ms	453 B
www.gatesnotes.com/_next/static/a5I8CDVgT5ZgQAIvjZQO1/_ssgManifest.js	1200.0 s	412 B
tr.outbrain.com/cachedClickId?marketerId=00532d9f645135488ac8aa9dd97a44b30c	0.0 ms	293 B
/p.css?s=1&k=zlx8cmq&ht=tk&f=53662.53663&a=18638983&app=t...	604800.0 s	172 B
/tr/?id=1984876168258538&ev=PageView&dl=https%3A%2F%2Fwww...	0.0 ms	16 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:3.0675589999999997] map[node:map[boundingRect:map[bottom:3596 height:960 left:0 right:412 top:2636 width:412] lhId:page-4-DIV nodeLabel:div.layout > main > div#TopicTimelineHolder > div#stack_home_fervo_collection path:1,HTML,1,BODY,0,DIV,1,DIV,6,DIV,0,MAIN,3,DIV,3,DIV selector:div.layout > main > div#TopicTimelineHolder > div#stack_home_fervo_collection snippet:<div class="CardOuterHolder" id="stack_home_fervo_collection"> type:node] score:1] map[node:map[boundingRect:map[bottom:3596 height:960 left:0 right:412 top:2636 width:412] lhId:page-4-DIV nodeLabel:div.layout > main > div#TopicTimelineHolder > div#stack_home_fervo_collection path:1,HTML,1,BODY,0,DIV,1,DIV,6,DIV,0,MAIN,3,DIV,3,DIV selector:div.layout > main > div#TopicTimelineHolder > div#stack_home_fervo_collection snippet:<div class="CardOuterHolder" id="stack_home_fervo_collection"> type:node] score:1] map[node:map[boundingRect:map[bottom:1742 height:975 left:0 right:412 top:767 width:412] lhId:page-6-DIV nodeLabel:POSITIVE CHARGE The future of energy is subatomic Demystifying the science be… path:1,HTML,1,BODY,0,DIV,1,DIV,6,DIV,0,MAIN,3,DIV,1,DIV selector:div.layout > main > div#TopicTimelineHolder > div#stack_homepage_collection_4 snippet:<div class="CardOuterHolder" id="stack_homepage_collection_4"> type:node] score:0.931463] map[node:map[boundingRect:map[bottom:2636 height:894 left:0 right:412 top:1742 width:412] lhId:page-7-DIV nodeLabel:Next-generation plants will usher in a Renaissance of nuclear energy. path:1,HTML,1,BODY,0,DIV,1,DIV,6,DIV,0,MAIN,3,DIV,2,DIV selector:div.layout > main > div#TopicTimelineHolder > div#stack_homepage_collection_0 snippet:<div class="CardOuterHolder" id="stack_homepage_collection_0"> type:node] score:0.068044] map[node:map[boundingRect:map[bottom:2636 height:894 left:0 right:412 top:1742 width:412] lhId:page-7-DIV nodeLabel:Next-generation plants will usher in a Renaissance of nuclear energy. path:1,HTML,1,BODY,0,DIV,1,DIV,6,DIV,0,MAIN,3,DIV,2,DIV selector:div.layout > main > div#TopicTimelineHolder > div#stack_homepage_collection_0 snippet:<div class="CardOuterHolder" id="stack_homepage_collection_0"> type:node] score:0.068044]]

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
www.gatesnotes.com/fonts/UntitledSans/UntitledSans-Bold.otf	80 ms
www.gatesnotes.com/fonts/ABCMarist/ABCMarist-Bold.otf	80 ms
www.gatesnotes.com/fonts/UntitledSans/UntitledSans-Regular.otf	55 ms
www.gatesnotes.com/_next/static/media/UntitledSans-Medium.e9222c54.otf	35 ms

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
Bill `div.expandedMenus > div#MeetBillmenu > div.expandedMenuBack > img`	/12514eb8-7b51-008e-41a9-512542cf683b/f05fc7d8-7973-4960-...	135.8 KiB	61.7 KiB
An image of Fervo Energy's Cape Station with an illustration of geothermal ener… `div.CollectionArticle > div.CollectionArticleLockupBottom > a.CollectionArticleImg > img.articleBackMi`	/12514eb8-7b51-008e-41a9-512542cf683b/d92646c0-45fd-4e4c-...	18.9 KiB	4.2 KiB
A collage of images representing innovation in nuclear fission and fusion. `a.articleBackTC > div.articleBackTCinner > div.articleBackTC_img > img.MobileOnly`	/12514eb8-7b51-008e-41a9-512542cf683b/85863a3f-0596-4826-...	16.6 KiB	4.1 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-3-VIDEO

nodeLabel: div#stack_the_next_generation_of_electricity_is_almost_here__e37f7ab > div.articleFBH > div.articleBackFBHvHolder > video#the_next_generation_of_electricity_is_almost_here__e37f7abmv

path: 1,HTML,1,BODY,0,DIV,1,DIV,6,DIV,0,MAIN,3,DIV,0,DIV,0,DIV,1,DIV,0,VIDEO

selector: div#stack_the_next_generation_of_electricity_is_almost_here__e37f7ab > div.articleFBH > div.articleBackFBHvHolder > video#the_next_generation_of_electricity_is_almost_here__e37f7abmv

snippet: <video id="the_next_generation_of_electricity_is_almost_here__e37f7abmv" class="MobileOnly articleBackFBHv" loop="" autoplay="" playsinline="" src="https://videos.gatesnotes.com/video/fetch/q_auto/g_auto/https://images.gat…">

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
fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&display=swap	549 B
/css2?family=Roboto+Condensed:ital,wght@0,100..900;1,100....	831 B
/css2?family=Inter:wght@100;200;300;400;500;600;700;800;9...	1.0 KiB	822 ms
fonts.googleapis.com/css2?family=Jersey+10&display=swap	865 B	155 ms
/css2?family=Special+Elite&display=swap%22%20rel=%22style...	469 B

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

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
div.layout > main > div#TopicTimelineHolder > div#stack_home_fervo_collection `div.layout > main > div#TopicTimelineHolder > div#stack_home_fervo_collection`	1.000
div.layout > main > div#TopicTimelineHolder > div#stack_home_fervo_collection `div.layout > main > div#TopicTimelineHolder > div#stack_home_fervo_collection`	1.000
POSITIVE CHARGE The future of energy is subatomic Demystifying the science be… `div.layout > main > div#TopicTimelineHolder > div#stack_homepage_collection_4`	0.931
Next-generation plants will usher in a Renaissance of nuclear energy. `div.layout > main > div#TopicTimelineHolder > div#stack_homepage_collection_0`	0.068
Next-generation plants will usher in a Renaissance of nuclear energy. `div.layout > main > div#TopicTimelineHolder > div#stack_homepage_collection_0`	0.068
Play button `div.articleInnerLock > a.articleRightFBH > div.ImgPlayButton > img.gnIcon`	0.000

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: 910 ms 51.5 KiB

URL	Transfer Size	Est Savings
www.gatesnotes.com/_next/static/css/2f3808217b871ef5.css	46.8 KiB	40.8 KiB
www.gatesnotes.com/_next/static/css/cd4d9b35cecc1d8c.css	10.6 KiB	10.6 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: 2.7 s 751.5 KiB

URL	Transfer Size	Est Savings
www.gatesnotes.com/_next/static/chunks/841-c303c864c87f260e.js	168.6 KiB	108.5 KiB
www.googletagmanager.com/gtag/js?id=G-W28JGKN201&cx=c&_slc=1	175.3 KiB	74.7 KiB
www.googletagmanager.com/gtag/js?id=G-BQ7PQXE0YK&cx=c&gtm=4e64k1	169.0 KiB	68.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-NV84C88	182.2 KiB	65.6 KiB
www.gatesnotes.com/_next/static/chunks/590-a960c64a2992861d.js	84.4 KiB	60.3 KiB
www.googletagmanager.com/gtag/destination?id=AW-881596413&cx=c&gtm=4e64k1	137.0 KiB	60.1 KiB
www.googletagmanager.com/gtag/destination?id=AW-775306143&cx=c&gtm=4e64k1	146.3 KiB	58.7 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js	105.4 KiB	55.7 KiB
www.gatesnotes.com/_next/static/chunks/2d36dd80-04e56ed63fd78439.js	57.9 KiB	50.4 KiB
www.gatesnotes.com/_next/static/chunks/pages/_app-ee22985bcf0d42fe.js	109.5 KiB	49.8 KiB
www.gatesnotes.com/_next/static/chunks/fb7d5399-99e317269aa82b77.js	74.3 KiB	39.6 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	33.8 KiB
www.gatesnotes.com/_next/static/chunks/4d99978a-d87e2051138f2be0.js	28.1 KiB	25.6 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.gatesnotes.com/_next/static/chunks/framework-d7eda8d01813ccd9.js	2.9 s	2.4 s	19 ms
Unattributable	2.7 s	466 ms	0.0 ms
www.googletagmanager.com/gtm.js?id=GTM-NV84C88	838 ms	603 ms	127 ms
www.gatesnotes.com/_next/static/chunks/pages/_app-ee22985bcf0d42fe.js	689 ms	302 ms	45 ms
www.googletagmanager.com/gtag/destination?id=AW-775306143&cx=c&gtm=4e64k1	586 ms	497 ms	58 ms
www.googletagmanager.com/gtag/js?id=G-BQ7PQXE0YK&cx=c&gtm=4e64k1	577 ms	468 ms	102 ms
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js	451 ms	344 ms	55 ms
www.googletagmanager.com/gtag/js?id=G-W28JGKN201&cx=c&_slc=1	451 ms	379 ms	65 ms
www.gatesnotes.com/_next/static/chunks/590-a960c64a2992861d.js	451 ms	126 ms	28 ms
www.googletagmanager.com/gtag/destination?id=AW-881596413&cx=c&gtm=4e64k1	351 ms	296 ms	49 ms
static.ads-twitter.com/uwt.js	329 ms	271 ms	37 ms
www.gatesnotes.com/	321 ms	5.9 ms	0.9 ms
b-code.liadm.com/a-05yv.min.js	272 ms	243 ms	23 ms
connect.facebook.net/en_US/fbevents.js	261 ms	186 ms	71 ms
scripts.clarity.ms/0.8.59/clarity.js	245 ms	220 ms	11 ms
www.gatesnotes.com/_next/static/chunks/94726e6d-7fc96c7c24f65974.js	243 ms	54 ms	5.9 ms
www.gatesnotes.com/_next/static/chunks/pages/index-4296506c4ac94a6c.js	233 ms	210 ms	0.3 ms
www.gatesnotes.com/_next/static/chunks/841-c303c864c87f260e.js	202 ms	68 ms	93 ms
/signals/config/1984876168258538?v=2.9.303&r=stable&domai...	192 ms	166 ms	26 ms
www.google-analytics.com/plugins/ua/linkid.js	132 ms	111 ms	0.5 ms
tags.srv.stackadapt.com/events.js	111 ms	101 ms	2.9 ms
www.redditstatic.com/ads/pixel.js	101 ms	82 ms	8.3 ms
www.google-analytics.com/analytics.js	97 ms	81 ms	14 ms
assets.adobedtm.com/ee4236cad46a/017c9210d029/launch-d9135d6ecfbf.min.js	90 ms	70 ms	16 ms
/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasure...	73 ms	65 ms	4.3 ms
snap.licdn.com/li.lms-analytics/insight.min.js	71 ms	63 ms	6.6 ms
www.gatesnotes.com/_next/static/chunks/main-d2a793b6dc23a82a.js	60 ms	47 ms	10 ms
analytics.tiktok.com/i18n/pixel/static/identify_5cff1caf.js	58 ms	39 ms	19 ms
amplify.outbrain.com/cp/obtp.js	56 ms	43 ms	7.5 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	8.3 s
Other	3.3 s
Script Parsing & Compilation	1.0 s
Garbage Collection	391 ms
Style & Layout	351 ms
Rendering	124 ms
Parse HTML & CSS	53 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
The page has an unload handler in the main frame.	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
/video/fetch/q_auto/g_auto/https://images.gatesnotes.com/...	9.0 MiB
/video/fetch/q_auto/g_auto/https://images.gatesnotes.com/...	6.7 MiB
www.googletagmanager.com/gtm.js?id=GTM-NV84C88	182.5 KiB
www.googletagmanager.com/gtag/js?id=G-W28JGKN201&cx=c&_slc=1	175.3 KiB
www.googletagmanager.com/gtag/js?id=G-BQ7PQXE0YK&cx=c&gtm=4e64k1	169.1 KiB
www.gatesnotes.com/_next/static/chunks/841-c303c864c87f260e.js	169.0 KiB
www.googletagmanager.com/gtag/destination?id=AW-775306143&cx=c&gtm=4e64k1	146.3 KiB
www.googletagmanager.com/gtag/destination?id=AW-881596413&cx=c&gtm=4e64k1	137.0 KiB
/12514eb8-7b51-008e-41a9-512542cf683b/f05fc7d8-7973-4960-...	136.4 KiB
www.gatesnotes.com/_next/static/chunks/pages/_app-ee22985bcf0d42fe.js	109.8 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
Bill `div.expandedMenus > div#MeetBillmenu > div.expandedMenuBack > img`	/12514eb8-7b51-008e-41a9-512542cf683b/f05fc7d8-7973-4960-...
A collage of images representing innovation in nuclear fission and fusion. `a.articleBackTC > div.articleBackTCinner > div.articleBackTC_img > img.MobileOnly`	/12514eb8-7b51-008e-41a9-512542cf683b/85863a3f-0596-4826-...

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

●Document request latency

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Network dependency tree

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 24 user timings

●Avoid long main-thread tasks 20 long tasks found

●Network Requests

●Network Round Trip Times 170 ms

●Server Backend Latencies 520 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 20 ms

○INP breakdown

○Avoid non-composited animations

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.

Internationalization and localization

If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These are opportunities to improve the interpretation of your content by users in different locales.

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
div#homepage_collection_0 > div.StandAloneNewVideoCard > a.GNLink > img.SAVC_Img `div#homepage_collection_0 > div.StandAloneNewVideoCard > a.GNLink > img.SAVC_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
siteHeaderLogo `div.siteHeader > div.siteHeaderInner > div.siteHeaderLeft > a`
div#Workmenu > div.expandedMenuInner > div.expandedMenuInnerLeft > a `div#Workmenu > div.expandedMenuInner > div.expandedMenuInnerLeft > a`
div#MeetBillmenu > div.expandedMenuInner > div.expandedMenuInnerLeft > a `div#MeetBillmenu > div.expandedMenuInner > div.expandedMenuInnerLeft > a`
div#Booksmenu > div.expandedMenuInner > div.expandedMenuInnerLeft > a `div#Booksmenu > div.expandedMenuInner > div.expandedMenuInnerLeft > a`
div#TopicTimelineHolder > div#stack_three_tough_truths_about_climate_home_full_bleed_c > div.articleFW > a.articleBackFW `div#TopicTimelineHolder > div#stack_three_tough_truths_about_climate_home_full_bleed_c > div.articleFW > a.articleBackFW`
Play button `div#stack_three_tough_truths_about_climate_home_full_bleed_c > div.articleFW > div.articleInnerLock > a.articleRightFW`

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.

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-*]` 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

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

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●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.

○`[accesskey]` values are unique

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

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

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

○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

○Buttons have an accessible name

○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

○Heading elements appear in a sequentially-descending order

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

○`<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

○Links are distinguishable without relying on color.

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

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

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

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

○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.

○Elements with visible text labels have matching accessible names.

○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

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 / Warning	Source
Unload event listeners are deprecated and will be removed.	www.gatesnotes.com/_next/static/chunks/pages/_app-ee22985bcf0d42fe.js
Topics	www.gatesnotes.com/_next/static/chunks/pages/_app-ee22985bcf0d42fe.js
AttributionReporting	www.gatesnotes.com/_next/static/chunks/pages/_app-ee22985bcf0d42fe.js

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.gatesnotes.com/	`NotSupportedError: Failed to load because no supported source was found.`

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
www.gatesnotes.com/_next/static/chunks/841-c303c864c87f260e.js

●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 issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

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

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
div#homepage_collection_0 > div.StandAloneNewVideoCard > a.GNLink > img.SAVC_Img `div#homepage_collection_0 > div.StandAloneNewVideoCard > a.GNLink > img.SAVC_Img`

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`