C — https://britannica.com | BeaverCheck Audit

Site Health

Score: 71 / 100

Based on 8 categories, 0 sections

Room to improve — your 8.0s load time is above Google's 2.5s 'Good' threshold.

Several missing protections leave your users and data exposed.

Several issues make your site difficult for assistive technology users.

Well-optimized for search — your content is discoverable.

Good server performance with room for optimization.

Mostly compliant — a few items need attention.

Rich content metadata — your pages look great everywhere.

Heavier than average — reducing page weight saves energy and bandwidth.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

Amazon ELB sites average 70

At average

Better than 50% of Amazon ELB sites See full Amazon ELB benchmark →

Amazon Route 53 sites average 72

At average

Better than 19% of Amazon Route 53 sites See full Amazon Route 53 benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

HSTS header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy

Page weighs 13.2 MB (4.3 MB transferred)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Budget

1 image(s) missing alt attribute

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Alt Text Quality

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fbritannica.com)](https://beavercheck.com/results/e1432918-d135-4895-bf8a-aa530f2b589e)

HTML

<a href="https://beavercheck.com/results/e1432918-d135-4895-bf8a-aa530f2b589e"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fbritannica.com" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fbritannica.com

This badge auto-updates with your latest scan result.

What fixing these means

Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 8.0s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. Addressing the critical issues below would have the most immediate impact on your user trust.

3 security gaps detected — browsers may warn visitors about your site.

Your LCP is 8.0s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.

1 accessibility issue excludes users who rely on assistive technology.

Conversion Barriers

3 critical 3 warning

6 barrier(s) likely increasing bounce by ~28%.

Speed (2)

Page takes 8.0s to load

+12% bounce

Users abandon at ~3s — you're 5.5s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

Page feels frozen for 5.9s

+5% bounce

Clicks on the primary CTA are ignored while JavaScript runs

Fix: Break up long tasks; defer non-critical JavaScript to post-hydration

Trust (2)

No HSTS header

+1% bounce

Returning visitors are briefly exposed to downgrade attacks on first request

Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Navigation (2)

No skip-to-content link

+1% bounce

Keyboard and screen-reader users must tab through the entire header on every page

Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element

3 broken link(s) on the page

+5% bounce

Clicks land on 404s — trust drops and the session often ends

Fix: Fix or remove the broken destinations surfaced on the Content tab

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

€425 investment → €4,953/month returns + EUR 120,500,000 risk avoided

Payback period: < 1 month First-year ROI: +13884%

Investment

€425

5h · 5 findings

Monthly returns

€4,953 /mo

~€59,433 / year

Conversions recovered €4,952
Bandwidth savings €1.01

Regulatory risk avoided

EUR 120,500,000

if kept compliant

ePrivacy Directive EUR 100,000,000
GDPR EUR 20,000,000
EAA EUR 500,000

Payback period

0 12mo 24mo

€128 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

€425

5.0 developer hours at €85/hr

Based on European Union rates (€85/hr)

Quick wins

€128 3 fixes in ~90 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

€ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

€10,041,668 / month at risk

~€120,500,012 / year if left unfixed

Compliance Risk

€120,500,000

ePrivacy DirectiveGDPREAA

No privacy policy link detected
GDPR: EUR 10,000 – EUR 20,000,000
11 advertising/retargeting trackers detected
GDPR: EUR 10,000 – EUR 20,000,000
Trackers detected but no cookie policy found
GDPR: EUR 5,000 – EUR 10,000,000

+8 more

Bandwidth Waste

€1.01 /mo

13632.0 MB/mo × 0.074 EUR/GB

Optimize transfer: save ~1.4 MB per page load
Saves €1.01/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 5 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.90 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

8.04 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

5.87 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

7.69 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

41.78 s

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

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

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
/signals/config/154643575315468?v=2.9.298&r=stable&domain...	1200.0 s	126.8 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.4 KiB
cdn.britannica.com/mendel-resources/3-180/dist/home-page.js?v=3.180.3	0.0 ms	82.8 KiB
c.amazon-adsystem.com/aax2/apstag.js	3600.0 s	90.9 KiB
client.aps.amazon-adsystem.com/publisher.js	3600.0 s	82.4 KiB
/bDEvaLBKr59eQh0skkFpECBYKXY/gpt_and_prebid/config.js	1100.0 s	72.7 KiB
cdn.confiant-integrations.net/TsA7cJ0fBBXaKHjAXxO1o_FLaZc/video/config.js	1100.0 s	66.6 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
jryhoywlyxnlymahs.ay.delivery/viewability/JRyhoywLYXNLYMAhs/viewability.min.js	900.0 s	63.5 KiB
jryhoywlyxnlymahs.ay.delivery/forest/JRyhoywLYXNLYMAhs/js/bid/forest.min.js	900.0 s	56.9 KiB
secure.cdn.fastclick.net/js/cnvr-coreid/latest/coreid.min.js	900.0 s	47.1 KiB
static.kueezrtb.com/js/latest.js?_=1776361794972	0.0 ms	37.4 KiB
jryhoywlyxnlymahs.ay.delivery/client-v2.js	0.0 ms	36.1 KiB
cdn.britannica.com/mendel-resources/3-180/dist/mendel-css.css?v=3.180.3	0.0 ms	30.7 KiB
cdn.britannica.com/mendel-resources/3-180/js/libs/jquery-3.5.0.min.js?v=3.180.3	0.0 ms	30.3 KiB
cdn.britannica.com/mendel-resources/3-180/dist/vendor-bundle.css?v=3.180.3	0.0 ms	23.0 KiB
secure.cdn.fastclick.net/js/cnvr-launcher/latest/launcher.min.js	900.0 s	24.7 KiB
jryhoywlyxnlymahs.ay.delivery/thirdparty/intentiq/IIQUniversalID-6.24.js	7200.0 s	29.1 KiB
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	900.0 s	21.7 KiB
b-code.liadm.com/did-0051.min.js	86400.0 s	45.8 KiB
s0.2mdn.net/879366/express_html_inpage_rendering_lib_200_287.js	86400.0 s	40.9 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js	3000.0 s	14.4 KiB
scripts.clarity.ms/0.8.59-beta/clarity.js	86400.0 s	26.2 KiB
cdn.britannica.com/mendel-resources/3-180/dist/_tailwind.css?v=3.180.3	0.0 ms	8.4 KiB
eus.rubiconproject.com/usync.js	37862.0 s	11.5 KiB
/mendel-resources/3-180/images/shared/britannica_black_ic...	0.0 ms	5.3 KiB
tags.crwdcntrl.net/lt/c/16576/sync.min.js	86400.0 s	13.1 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB
a.amxrtb.com/js/cframe.js#gdpr=0&gdpr_consent=&cc=SG	14400.0 s	5.1 KiB
sb.scorecardresearch.com/internal-cs/default/beacon-and.js	86400.0 s	7.8 KiB
/dcdn/settings.js?a=698824&settings_type=4&ts=1776342344&...	1800.0 s	3.2 KiB
config.aps.amazon-adsystem.com/configs/3022	3600.0 s	3.0 KiB
cdn.britannica.com/mendel-resources/3-180/dist/9434.965987b7.js	0.0 ms	2.4 KiB
cdn.britannica.com/mendel-resources/3-180/dist/home-page.css?v=3.180.3	0.0 ms	1.8 KiB
www.britannica.com/webstats/mendelstats.js?v=1	0.0 ms	1.8 KiB
/0ccc6fe8-1870-4ad8-b47b-6d029ac116fc/launchpad-liveramp.js	0.0 ms	1.8 KiB
ads.pubmatic.com/AdServer/js/userSync.js	72582.0 s	3.9 KiB
cdn.britannica.com/mendel-resources/3-180/dist/380.37544704.js	0.0 ms	1.2 KiB
pagead2.googlesyndication.com/pagead/js/r20260415/r20110914/abg_lite.js	1209600.0 s	10.5 KiB
cdn.britannica.com/mendel-resources/3-180/dist/380.06e77751.css	0.0 ms	1004 B
secure.cdn.fastclick.net/js/cnvr-launcher/latest/launcher-stub.min.js	900.0 s	1.1 KiB
id5-sync.com/i/102/9.gif?gdpr=0&gdpr_consent=	0.0 ms	916 B
/cs/usync?idmn=241&id=7UxfbSjOMbRazKTtDl6_KfEhdLpsiPyzPN7...	0.0 ms	894 B
/cs/usync?idmn=231&type=iframe&id=94a8d793-39e9-4bbb-9dbd...	0.0 ms	892 B
/cs/usync?idmn=869&type=iframe&id=99711950-2873-53ba-befc...	0.0 ms	887 B
/cs/usync?idmn=sharthrough&id=7fb5c75b-7195-4c55-a0bf-717...	0.0 ms	886 B
/cs/usync?idmn=1083&type=iframe&id=99711950-2873-53ba-bef...	0.0 ms	886 B
/cs/usync?idmn=109&type=iframe&id=99f52a61-0302-49ce-99d5...	0.0 ms	885 B
ssp.api.tappx.com/cs/usync?idmn=58&type=iframe&id=213774842609461&auxuid=	0.0 ms	870 B
ssp.api.tappx.com/cs/usync?idmn=45&id=309980679796215425&gdpr=0&gdpr_consent=	0.0 ms	868 B
/pagead/js/r20260415/r20110914/client/qs_click_protection...	1209600.0 s	8.6 KiB
ssp.api.tappx.com/cs/usync?idmn=82&type=iframe&id=191241595d&auxuid=	0.0 ms	858 B
ssp.api.tappx.com/cs/usync?idmn=999523&type=iframe&id=GDPR&auxuid=	0.0 ms	858 B
cdn.britannica.com/mendel-resources/3-180/dist/9434.f2acc0d9.css	0.0 ms	566 B
/cookie?redirect_url=https%3A%2F%2Fmeasureadv.com%2FuserB...	0.0 ms	520 B
/api/cookie?partnerId=kueez-medinet&gdpr=&gdpr_consent=&u...	0.0 ms	495 B
/api/cookie?partnerId=kueez-trustedstack&userId=419363403...	0.0 ms	495 B
/api/cookie?partnerId=kueez-sovrn&gdpr=&gdpr_consent=&us_...	0.0 ms	495 B
/pagead/js/r20260415/r20110914/elements/html/omrhp.js	1209600.0 s	4.7 KiB
/usersync/ogury/?cb=https%3A%2F%2Fms-cookie-sync.presage....	0.0 ms	405 B
/pixel/bounce/?pid=c9gd671&t=gif&uid=WHieymnhIU5sZuxSC6VR...	0.0 ms	354 B
/track/cmb/generic?ttd_pid=agyie4r&ttd_tpi=1&gdpr=0&gdpr_...	0.0 ms	254 B
syncingbridge.com/userBack?uid=4193634052285687000V10&p=1	0.0 ms	240 B
syncingbridge.com/userBackIframe?uid=4193634063699284000V10&p=1	0.0 ms	232 B
syncingbridge.com/userBackIframe?uid=4193634055298620000V10&p=4	0.0 ms	232 B
/userBackIframe?uid=6657968834642497055&gdpr=%7BGDPR%7D&g...	0.0 ms	229 B
measureadv.com/userBackIframe?uid=&gdpr={GDPR}&gdpr_consent={GDPR_CONSENT}&p=9	0.0 ms	229 B
/ul_cb/dsp_match/275?ssp=45&r=https%3A%2F%2Frtb-csync.sma...	0.0 ms	198 B
/ul_cb/server_match?partner_id=1805&gdpr=0&gdpr_consent=&...	0.0 ms	198 B
/pagead/js/r20260415/r20110914/client/window_focus_fy2021.js	1209600.0 s	1.6 KiB
/cm-notify?pi=ogury&gdpr=0&gdpr_consent=us_privacy=%7b%7b...	0.0 ms	124 B
cdn.indexww.com/ht/htw-pixel.gif?0	86400.0 s	223 B
/v.gif?cd=0&a=698824&d=britannica.com&u=D84F5C49C62FBBB10...	43200.0 s	148 B
/cksync?cs=146&gdpr=0&gdpr_consent=&type=vid&redirect=htt...	0.0 ms	58 B
/api/sync?callerId=5&gdpr=1&gdpr_consent=&us_privacy={{US...	0.0 ms	44 B
/AdServer/ImgSync?p=162110&gdpr=&gdpr_consent=&pu=https%3...	0.0 ms	40 B
/AdServer/ImgSync?p=159706&gdpr=1&gdpr_consent=&us_privac...	0.0 ms	40 B
/AdServer/ImgSync?p=161018&gdpr=0&gdpr_consent=&pu=https%...	0.0 ms	40 B
/hadron.js?url=https%3A%2F%2Fwww.britannica.com%2F&ref=&_...	432000.0 s	187 B
/tr/?id=154643575315468&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	19 B
eus.rubiconproject.com/usync.js	37862.0 s	0 B
eus.rubiconproject.com/usync.js	37862.0 s	0 B
eus.rubiconproject.com/usync.js	37862.0 s	0 B
eus.rubiconproject.com/usync.js	37862.0 s	0 B
eus.rubiconproject.com/usync.js	37862.0 s	0 B
eus.rubiconproject.com/usync.js	37862.0 s	0 B
eus.rubiconproject.com/usync.js	37862.0 s	0 B
eus.rubiconproject.com/usync.js	37862.0 s	0 B
a.amxrtb.com/js/cframe.js#gdpr=0&gdpr_consent=&cc=SG	14400.0 s	0 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.

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/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2	50 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:151.055 source:map[type:text value:[unattributed]]]]

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.grid > div.col-sm-40 > a > img.col-70 `div.grid > div.col-sm-40 > a > img.col-70`	cdn.britannica.com/marketing/Premium-alldevices-white-2026.jpg	312.5 KiB	298.4 KiB
	s0.2mdn.net/sadbundle/6424884103987137592/dream32050/dream32050.jpeg	64.7 KiB	56.7 KiB
The Missing Letter `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/missingLetter.png?w=629&h=472&c=crop	40.9 KiB	36.7 KiB
The Loop - NEW `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/marketing/Loop-promo-4-3.png?w=629&h=472&c=crop	23.7 KiB	21.3 KiB
Reunion `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/Reunion4-3Big.png?w=629&h=472&c=crop	23.7 KiB	19.6 KiB
Tightrope `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/tightrope_promo_4_3_2x.webp?w=629&h=472&c=crop	17.8 KiB	16.0 KiB
Revealed `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/revealed-485-364-1x.png?w=629&h=472&c=crop	17.1 KiB	14.1 KiB
Terracotta Soldiers in trenches, Mausoleum of Emperor Qin Shi Huang, Xi'an, Sha… `div.card > div.card-media > a.position-relative > img.w-100`	/30/153530-050-9A8F7D46/Xian-soldiers-horses-tomb-Qin-emp...	15.3 KiB	11.5 KiB
Pyramids of Giza, Cairo, Egypt (desert, pyramid, Egyptian ruins, history, histo… `div.card > div.card-media > a.position-relative > img.w-100`	/39/155939-050-A709B5D7/Pyramids-Giza-Cairo-Egypt.jpg?w=7...	43.8 KiB	9.1 KiB
Angkor Wat, Cambodia `div.card > div.card-media > a.position-relative > img.w-100`	/49/94449-050-ECB0E7C2/Angkor-Wat-temple-complex-Cambodia...	12.9 KiB	9.0 KiB
Blossom `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/blossom1x.jpeg?w=629&h=472&c=crop	9.4 KiB	7.8 KiB
Pilfer `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/pilfer.png?w=629&h=472&c=crop	8.3 KiB	6.9 KiB
Octordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/octordle-4x3.png?w=629&h=472&c=crop	5.9 KiB	4.9 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-7-IMG

nodeLabel: Pyramids of Giza, Cairo, Egypt (desert, pyramid, Egyptian ruins, history, histo…

path: 1,HTML,1,BODY,7,MAIN,0,DIV,0,DIV,1,DIV,5,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,DIV,0,A,0,IMG

selector: div.card > div.card-media > a.position-relative > img.w-100

snippet: <img loading="eager" src="https://cdn.britannica.com/39/155939-050-A709B5D7/Pyramids-Giza-Cairo-Egyp…" alt="Pyramids of Giza, Cairo, Egypt (desert, pyramid, Egyptian ruins, history, …" class="w-100 ">

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

value: No additional origins are good candidates for preconnecting

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
jryhoywlyxnlymahs.ay.delivery/manager/JRyhoywLYXNLYMAhs	34.4 KiB	1.7 s
cdn.britannica.com/mendel-resources/3-180/dist/mendel-css.css?v=3.180.3	30.7 KiB	604 ms
cdn.britannica.com/mendel-resources/3-180/dist/vendor-bundle.css?v=3.180.3	23.0 KiB	604 ms
fonts.googleapis.com/icon?family=Material+Icons	820 B	762 ms
cdn.britannica.com/mendel-resources/3-180/dist/home-page.css?v=3.180.3	1.8 KiB	151 ms
cdn.britannica.com/mendel-resources/3-180/dist/_tailwind.css?v=3.180.3	8.4 KiB	928 ms

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
/cs/usersync.php?gdpr_optin=&gdpr_consent=&us_privacy=&ty...	http/1.1
/cs/usync?idmn=109&type=iframe&id=99f52a61-0302-49ce-99d5...	http/1.1
/cs/usync?idmn=sharthrough&id=7fb5c75b-7195-4c55-a0bf-717...	http/1.1
/cs/usync?idmn=231&type=iframe&id=94a8d793-39e9-4bbb-9dbd...	http/1.1
ssp.api.tappx.com/cs/usync?idmn=82&type=iframe&id=191241595d&auxuid=	http/1.1
ssp.api.tappx.com/cs/usync?idmn=13&type=iframe&id=&auxuid=	http/1.1
/cs/usync?idmn=511&type=iframe&id=b58b33e72d2048fb9ba844e...	http/1.1
ssp.api.tappx.com/cs/usync?idmn=45&id=309980679796215425&gdpr=0&gdpr_consent=	http/1.1
/cs/usync?idmn=241&id=7UxfbSjOMbRazKTtDl6_KfEhdLpsiPyzPN7...	http/1.1
ssp.api.tappx.com/cs/usync?idmn=999523&type=iframe&id=GDPR&auxuid=	http/1.1
/cs/usync?idmn=31&type=iframe&id=dca0f67a-375e-436d-9db9-...	http/1.1
/cs/usync?idmn=1083&type=iframe&id=99711950-2873-53ba-bef...	http/1.1
/cs/usync?idmn=869&type=iframe&id=99711950-2873-53ba-befc...	http/1.1
ssp.api.tappx.com/cs/usync?idmn=58&type=iframe&id=213774842609461&auxuid=	http/1.1

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: 1.5 s

URL	Time Spent
britannica.com/	1.5 s
www.britannica.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: 150 ms 40.3 KiB

URL	Transfer Size	Est Savings
cdn.britannica.com/mendel-resources/3-180/dist/vendor-bundle.css?v=3.180.3	22.6 KiB	20.3 KiB
cdn.britannica.com/mendel-resources/3-180/dist/mendel-css.css?v=3.180.3	30.4 KiB	20.0 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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

Estimated savings: 300 ms 887.9 KiB

URL	Transfer Size	Est Savings
/manager-script/JRyhoywLYXNLYMAhs.deploy?v=qaZ4uJbGiLe4rAGcW	179.8 KiB	98.9 KiB
/pagead/managed/js/gpt/m202604140101/pubads_impl.js?cb=31...	187.7 KiB	92.1 KiB
/floorPrice/v5/JRyhoywLYXNLYMAhs?t=1776361793120&d=www.br...	79.7 KiB	79.6 KiB
www.googletagmanager.com/gtag/js?id=G-TE6YF92Y0D&cx=c&gtm=4e64f0	175.4 KiB	68.0 KiB
cdn.confiant-integrations.net/gptprebidnative/202603241056/wrap.js	141.5 KiB	67.4 KiB
cdn.confiant-integrations.net/video/202603241056/wrap.js	125.0 KiB	67.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-KRJ753NG	127.1 KiB	59.8 KiB
jryhoywlyxnlymahs.ay.delivery/forest/JRyhoywLYXNLYMAhs/js/bid/forest.min.js	56.4 KiB	52.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-5W6NC8	153.6 KiB	50.4 KiB
cdn.britannica.com/mendel-resources/3-180/dist/home-page.js?v=3.180.3	82.5 KiB	41.0 KiB
/ats-modules/84ec2d91-221f-4812-9e59-96237edded0f/ats.js	74.6 KiB	39.0 KiB
connect.facebook.net/en_US/fbevents.js	96.3 KiB	35.2 KiB
/signals/config/154643575315468?v=2.9.298&r=stable&domain...	126.6 KiB	31.6 KiB
b-code.liadm.com/did-0051.min.js	45.5 KiB	31.3 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	73.1 KiB	30.4 KiB
jryhoywlyxnlymahs.ay.delivery/manager-script/yield-manager-script-v3.11.1-prod	48.5 KiB	23.5 KiB
ajs-assets.ftstatic.com/ftUtils.js	33.1 KiB	20.2 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.britannica.com/	2.4 s	740 ms	167 ms
Unattributable	1.8 s	294 ms	0.0 ms
jryhoywlyxnlymahs.ay.delivery/manager-script/yield-manager-script-v3.11.1-prod	1.8 s	1.6 s	121 ms
cdn.confiant-integrations.net/video/202603241056/wrap.js	794 ms	734 ms	48 ms
www.googletagmanager.com/gtm.js?id=GTM-5W6NC8	787 ms	648 ms	77 ms
scripts.clarity.ms/0.8.59-beta/clarity.js	628 ms	584 ms	11 ms
cdn.confiant-integrations.net/gptprebidnative/202603241056/wrap.js	623 ms	552 ms	60 ms
/manager-script/JRyhoywLYXNLYMAhs.deploy?v=qaZ4uJbGiLe4rAGcW	546 ms	438 ms	85 ms
static.kueezrtb.com/js/latest.js?_=1776361794972	500 ms	374 ms	9.9 ms
www.googletagmanager.com/gtag/js?id=G-TE6YF92Y0D&cx=c&gtm=4e64f0	498 ms	417 ms	76 ms
/signals/config/154643575315468?v=2.9.298&r=stable&domain...	489 ms	395 ms	89 ms
c.amazon-adsystem.com/aax2/apstag.js	488 ms	415 ms	58 ms
/pagead/managed/js/gpt/m202604140101/pubads_impl.js?cb=31...	401 ms	299 ms	78 ms
www.googletagmanager.com/gtm.js?id=GTM-KRJ753NG	344 ms	280 ms	56 ms
cdn.britannica.com/mendel-resources/3-180/dist/home-page.js?v=3.180.3	247 ms	201 ms	37 ms
secure.cdn.fastclick.net/js/cnvr-coreid/latest/coreid.min.js	204 ms	167 ms	36 ms
jryhoywlyxnlymahs.ay.delivery/thirdparty/intentiq/IIQUniversalID-6.24.js	185 ms	156 ms	15 ms
connect.facebook.net/en_US/fbevents.js	179 ms	125 ms	53 ms
/ats-modules/84ec2d91-221f-4812-9e59-96237edded0f/ats.js	142 ms	109 ms	32 ms
ep2.adtrafficquality.google/sodar/sodar2.js	141 ms	133 ms	3.6 ms
tags.crwdcntrl.net/lt/c/16576/sync.min.js	124 ms	104 ms	6.0 ms
jryhoywlyxnlymahs.ay.delivery/client-v2.js	122 ms	90 ms	16 ms
securepubads.g.doubleclick.net/tag/js/gpt.js	111 ms	96 ms	14 ms
/floorPrice/v5/JRyhoywLYXNLYMAhs?t=1776361793120&d=www.br...	93 ms	2.7 ms	89 ms
sb.scorecardresearch.com/cs/6035486/beacon.js	92 ms	66 ms	3.2 ms
secure.cdn.fastclick.net/js/cnvr-launcher/latest/launcher.min.js	83 ms	68 ms	12 ms
/bDEvaLBKr59eQh0skkFpECBYKXY/gpt_and_prebid/config.js	82 ms	36 ms	46 ms
cdn.confiant-integrations.net/TsA7cJ0fBBXaKHjAXxO1o_FLaZc/video/config.js	80 ms	38 ms	42 ms
launchpad.privacymanager.io/latest/launchpad.bundle.js	78 ms	50 ms	26 ms
config.aps.amazon-adsystem.com/configs/3022	66 ms	60 ms	3.6 ms
jryhoywlyxnlymahs.ay.delivery/forest/JRyhoywLYXNLYMAhs/js/bid/forest.min.js	65 ms	7.5 ms	57 ms
jryhoywlyxnlymahs.ay.delivery/manager/JRyhoywLYXNLYMAhs	63 ms	36 ms	25 ms
cdn.britannica.com/mendel-resources/3-180/js/libs/jquery-3.5.0.min.js?v=3.180.3	63 ms	44 ms	15 ms
b-code.liadm.com/did-0051.min.js	58 ms	39 ms	19 ms
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	58 ms	49 ms	8.5 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	9.9 s
Other	2.1 s
Script Parsing & Compilation	1.5 s
Style & Layout	928 ms
Garbage Collection	330 ms
Rendering	138 ms
Parse HTML & CSS	124 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

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 14.1 KiB

URL	Transfer Size	Est Savings
launchpad.privacymanager.io/latest/launchpad.bundle.js	45.0 KiB	14.1 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
cdn.britannica.com/marketing/Premium-alldevices-white-2026.jpg	306.8 KiB
/pagead/managed/js/gpt/m202604140101/pubads_impl.js?cb=31...	187.7 KiB
/manager-script/JRyhoywLYXNLYMAhs.deploy?v=qaZ4uJbGiLe4rAGcW	180.2 KiB
www.googletagmanager.com/gtag/js?id=G-TE6YF92Y0D&cx=c&gtm=4e64f0	175.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-5W6NC8	153.7 KiB
cdn.confiant-integrations.net/gptprebidnative/202603241056/wrap.js	141.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-KRJ753NG	127.4 KiB
/signals/config/154643575315468?v=2.9.298&r=stable&domain...	126.8 KiB
fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2	125.6 KiB
cdn.confiant-integrations.net/video/202603241056/wrap.js	125.4 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.grid > div.col-sm-40 > a > img.col-70 `div.grid > div.col-sm-40 > a > img.col-70`	cdn.britannica.com/marketing/Premium-alldevices-white-2026.jpg
Pyramids of Giza, Cairo, Egypt (desert, pyramid, Egyptian ruins, history, histo… `div.card > div.card-media > a.position-relative > img.w-100`	/39/155939-050-A709B5D7/Pyramids-Giza-Cairo-Egypt.jpg?w=7...
Quordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/quordle.jpeg?w=629&h=472&c=crop
The Loop - NEW `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/marketing/Loop-promo-4-3.png?w=629&h=472&c=crop
Tightrope `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/tightrope_promo_4_3_2x.webp?w=629&h=472&c=crop
The Missing Letter `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/missingLetter.png?w=629&h=472&c=crop
Reunion `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/Reunion4-3Big.png?w=629&h=472&c=crop
Revealed `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/revealed-485-364-1x.png?w=629&h=472&c=crop
Pilfer `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/pilfer.png?w=629&h=472&c=crop
Blossom `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/blossom1x.jpeg?w=629&h=472&c=crop
Octordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/octordle-4x3.png?w=629&h=472&c=crop
S&P 500 vs. Cboe Volatility Index (VIX) `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/09/265709-050-11F07D26/vix-spikes-and-valleys-graph.jpg?...
Digital collage of a tiny woman stepping on a calculator key while carrying an … `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/68/274968-159-3B823731/Inflation-Calculator-photo-illust...
Photo illustration: Tinker toys arranged in a hub `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/39/264539-159-31C4BE40/Centralized-vs-Decentralized-Cryp...
Collage of people with financial symbols, including a large green clock, house,… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/07/278607-049-30717896/learning-journey-retirement-savin...
Angkor Wat, Cambodia `div.card > div.card-media > a.position-relative > img.w-100`	/49/94449-050-ECB0E7C2/Angkor-Wat-temple-complex-Cambodia...
Terracotta Soldiers in trenches, Mausoleum of Emperor Qin Shi Huang, Xi'an, Sha… `div.card > div.card-media > a.position-relative > img.w-100`	/30/153530-050-9A8F7D46/Xian-soldiers-horses-tomb-Qin-emp...
Britannica Money `div.grid > div.col-100 > a.gtm-money-cta-logo > img.col-65`	cdn.britannica.com/money/assets/britannica-money-global-nav-logo-250x30-2x.png
Twofer Goofer `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`
Victordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`
Sudoku `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`

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

●Optimize viewport for mobile

●Minify CSS

●User Timing marks and measures 13 user timings

●Avoid long main-thread tasks 20 long tasks found

●Network Requests

●Network Round Trip Times 260 ms

●Server Backend Latencies 8,130 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 70 ms

○INP breakdown

○Avoid non-composited animations

○Avoid large layout shifts

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.

Names and labels

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.global-nav-top-bar > div.grid > div.col-35 > button.js-toggle-user-dropdown `div.global-nav-top-bar > div.grid > div.col-35 > button.js-toggle-user-dropdown`

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.grid > div.col-sm-40 > a > img.col-70 `div.grid > div.col-sm-40 > a > img.col-70`

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.marketing-HOMEPAGE_BOTTOM_SUBSCRIBE2 > div.grid > div.col-sm-40 > a `div.marketing-HOMEPAGE_BOTTOM_SUBSCRIBE2 > div.grid > div.col-sm-40 > 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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
archaeologists `div.cards3up > div.kic-title-container > div.font-serif > a.md-crosslink`
ancient Egyptian `div.cards3up > div.kic-title-container > div.font-serif > a.md-crosslink`
divine kingship `div.cards3up > div.kic-title-container > div.font-serif > a.md-crosslink`
afterlife `div.cards3up > div.kic-title-container > div.font-serif > a.md-crosslink`
Canada `div.feature-block > div.oyr-title-container > p.font-serif > a.md-crosslink`
Liberal `div.feature-block > div.oyr-title-container > p.font-serif > a.md-crosslink`
Mark Carney `div.feature-block > div.oyr-title-container > p.font-serif > a.md-crosslink`
Benin `div.feature-block > div.oyr-title-container > p.font-serif > a.md-crosslink`
Hungary `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Viktor Orbán `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Péter Magyar `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
European Union `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Peru `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Alberto Fujimori `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
has secured a place in the June 7 runoff `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Ismail Omar Guelleh `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Since he first took office in 1999 `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
strategic location `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`

These are opportunities to improve the legibility of your content.

○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>`

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

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

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

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●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

●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.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

○`[accesskey]` values are unique

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

○Deprecated ARIA roles were not used

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○`[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

○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 buttons have discernible text.

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

○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>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○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
Topics	/manager-script/JRyhoywLYXNLYMAhs.deploy?v=qaZ4uJbGiLe4rAGcW line 11, col 83886
Unload event listeners are deprecated and will be removed.	line 1, col 194
AttributionReporting	connect.facebook.net/en_US/fbevents.js line 279, col 769
SharedStorage	/pagead/managed/js/activeview/current/ufs_web_display.js line 252, col 234

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.britannica.com/	`Access to fetch at 'https://rp.liadm.com/j?dtstmp=1776361795361&did=did-0051&se=e30&duid=e85d52b04a00--01kpbpkv7qtqg8sk0rcjrvfnbh&tv=10.27.0&pu=https%3A%2F%2Fwww.britannica.com%2F&wpn=prebid&cd=.britannica.com' from origin 'https://www.britannica.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
www.britannica.com/	`Access to fetch at 'https://rp.liadm.com/j?dtstmp=1776361795361&did=did-0051&se=e30&duid=e85d52b04a00--01kpbpkv7qtqg8sk0rcjrvfnbh&tv=10.27.0&pu=https%3A%2F%2Fwww.britannica.com%2F&wpn=prebid&cd=.britannica.com' from origin 'https://www.britannica.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
www.britannica.com/	`Access to fetch at 'https://rp.liadm.com/j?dtstmp=1776361795361&did=did-0051&se=e30&duid=e85d52b04a00--01kpbpkv7qtqg8sk0rcjrvfnbh&tv=10.27.0&pu=https%3A%2F%2Fwww.britannica.com%2F&wpn=prebid&cd=.britannica.com' from origin 'https://www.britannica.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
www.britannica.com/	`Access to fetch at 'https://rp.liadm.com/j?dtstmp=1776361795361&did=did-0051&se=e30&duid=e85d52b04a00--01kpbpkv7qtqg8sk0rcjrvfnbh&tv=10.27.0&pu=https%3A%2F%2Fwww.britannica.com%2F&wpn=prebid&cd=.britannica.com' from origin 'https://www.britannica.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
/j?dtstmp=1776361795361&did=did-0051&se=e30&duid=e85d52b0...	`Failed to load resource: net::ERR_FAILED`
/j?dtstmp=1776361795361&did=did-0051&se=e30&duid=e85d52b0...	`Failed to load resource: net::ERR_FAILED`
/j?dtstmp=1776361795361&did=did-0051&se=e30&duid=e85d52b0...	`Failed to load resource: net::ERR_FAILED`
/j?dtstmp=1776361795361&did=did-0051&se=e30&duid=e85d52b0...	`Failed to load resource: net::ERR_FAILED`
/FGMrCMMc/v1?gdpr=&gdpr_consent=&us_privacy=&gpp=&gpp_sid...	`Failed to load resource: the server responded with a status of 422 ()`
	`Framing 'https://www.google.com/' violates the following report-only Content Security Policy directive: "frame-ancestors 'self'". The violation has been logged, but no further action has been taken.`

Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Issue type
Content security policy

●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

●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

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.grid > div.col-sm-40 > a > img.col-70 `div.grid > div.col-sm-40 > a > img.col-70`

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`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.73 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.31 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

788 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.002

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.28 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

8.92 s

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.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Source: Google web.dev / Lighthouse

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
/signals/config/154643575315468?v=2.9.298&r=stable&domain...	1200.0 s	126.7 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.4 KiB
cdn.britannica.com/mendel-resources/3-180/dist/home-page.js?v=3.180.3	0.0 ms	82.8 KiB
c.amazon-adsystem.com/aax2/apstag.js	3600.0 s	90.9 KiB
client.aps.amazon-adsystem.com/publisher.js	3600.0 s	82.4 KiB
/bDEvaLBKr59eQh0skkFpECBYKXY/gpt_and_prebid/config.js	1100.0 s	72.7 KiB
cdn.confiant-integrations.net/TsA7cJ0fBBXaKHjAXxO1o_FLaZc/video/config.js	1100.0 s	66.6 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
jryhoywlyxnlymahs.ay.delivery/viewability/JRyhoywLYXNLYMAhs/viewability.min.js	900.0 s	63.3 KiB
jryhoywlyxnlymahs.ay.delivery/forest/JRyhoywLYXNLYMAhs/js/bid/forest.min.js	900.0 s	56.9 KiB
secure.cdn.fastclick.net/js/cnvr-coreid/latest/coreid.min.js	900.0 s	47.1 KiB
static.kueezrtb.com/js/latest_cls.js?_=1776361854946	0.0 ms	37.2 KiB
jryhoywlyxnlymahs.ay.delivery/client-v2.js	0.0 ms	36.2 KiB
cdn.britannica.com/mendel-resources/3-180/dist/mendel-css.css?v=3.180.3	0.0 ms	30.7 KiB
cdn.britannica.com/mendel-resources/3-180/js/libs/jquery-3.5.0.min.js?v=3.180.3	0.0 ms	30.4 KiB
cdn.britannica.com/mendel-resources/3-180/dist/vendor-bundle.css?v=3.180.3	0.0 ms	23.0 KiB
secure.cdn.fastclick.net/js/cnvr-launcher/latest/launcher.min.js	900.0 s	24.7 KiB
jryhoywlyxnlymahs.ay.delivery/thirdparty/intentiq/IIQUniversalID-6.24.js	7200.0 s	29.2 KiB
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	900.0 s	21.7 KiB
b-code.liadm.com/did-0051.min.js	86400.0 s	45.8 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js	3000.0 s	14.4 KiB
scripts.clarity.ms/0.8.59-beta/clarity.js	86400.0 s	26.2 KiB
cdn.britannica.com/mendel-resources/3-180/dist/_tailwind.css?v=3.180.3	0.0 ms	8.4 KiB
eus.rubiconproject.com/usync.js	37805.0 s	11.5 KiB
/mendel-resources/3-180/images/shared/britannica_black_ic...	0.0 ms	5.3 KiB
tags.crwdcntrl.net/lt/c/16576/sync.min.js	86400.0 s	13.1 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB
a.amxrtb.com/js/cframe.js#gdpr=0&gdpr_consent=&cc=SG	14400.0 s	5.1 KiB
/dcdn/settings.js?a=698824&settings_type=4&ts=1776342344&...	1800.0 s	3.2 KiB
sb.scorecardresearch.com/internal-cs/default/beacon.js	86400.0 s	6.7 KiB
config.aps.amazon-adsystem.com/configs/3022	3600.0 s	3.0 KiB
cdn.britannica.com/mendel-resources/3-180/dist/9434.965987b7.js	0.0 ms	2.4 KiB
cdn.britannica.com/mendel-resources/3-180/dist/home-page.css?v=3.180.3	0.0 ms	1.8 KiB
www.britannica.com/webstats/mendelstats.js?v=1	0.0 ms	1.8 KiB
/0ccc6fe8-1870-4ad8-b47b-6d029ac116fc/launchpad-liveramp.js	0.0 ms	1.8 KiB
ads.pubmatic.com/AdServer/js/userSync.js	72529.0 s	3.9 KiB
cdn.britannica.com/mendel-resources/3-180/dist/380.37544704.js	0.0 ms	1.2 KiB
cdn.britannica.com/mendel-resources/3-180/dist/380.06e77751.css	0.0 ms	1003 B
secure.cdn.fastclick.net/js/cnvr-launcher/latest/launcher-stub.min.js	900.0 s	1.1 KiB
/pagead/js/r20260415/r20110914/client/qs_click_protection...	1209600.0 s	8.9 KiB
/cs/usync?idmn=241&id=EtEAxgzteXTiuqonu1W9MkwDyPKxPAFjp_7...	0.0 ms	894 B
/cs/usync?idmn=1083&type=iframe&id=99711950-2873-53ba-bef...	0.0 ms	888 B
/cs/usync?idmn=109&type=iframe&id=84417c5e-1f5d-4c7f-a799...	0.0 ms	887 B
/cs/usync?idmn=231&type=iframe&id=42d2ee06-b215-4d96-a4dd...	0.0 ms	887 B
/cs/usync?idmn=869&type=iframe&id=99711950-2873-53ba-befc...	0.0 ms	887 B
/cs/usync?idmn=sharthrough&id=b3b7f68d-817b-48ed-b5bb-c53...	0.0 ms	886 B
ssp.api.tappx.com/cs/usync?idmn=45&id=4374974055011110613&gdpr=0&gdpr_consent=	0.0 ms	869 B
ssp.api.tappx.com/cs/usync?idmn=58&type=iframe&id=213748417047963&auxuid=	0.0 ms	865 B
ssp.api.tappx.com/cs/usync?idmn=82&type=iframe&id=a6c83efb8d&auxuid=	0.0 ms	860 B
ssp.api.tappx.com/cs/usync?idmn=999523&type=iframe&id=GDPR&auxuid=	0.0 ms	858 B
ssp.api.tappx.com/cs/usync?idmn=162&type=iframe&id=OPTOUT&auxuid=	0.0 ms	857 B
pagead2.googlesyndication.com/pagead/js/r20260415/r20110914/abg_lite_fy2021.js	1209600.0 s	8.4 KiB
cdn.britannica.com/mendel-resources/3-180/dist/9434.f2acc0d9.css	0.0 ms	564 B
/cookie?redirect_url=https%3A%2F%2Fmeasureadv.com%2FuserB...	0.0 ms	520 B
/api/cookie?partnerId=kueez-medinet&gdpr=&gdpr_consent=&u...	0.0 ms	495 B
/api/cookie?partnerId=kueez-trustedstack&userId=419363456...	0.0 ms	495 B
/api/cookie?partnerId=kueez-sovrn&gdpr=&gdpr_consent=&us_...	0.0 ms	495 B
/usersync/ogury/?cb=https%3A%2F%2Fms-cookie-sync.presage....	0.0 ms	405 B
/pixel/bounce/?pid=c9gd671&t=gif&uid=lfxDTmnhIYPAhy9LWtVp...	0.0 ms	354 B
/pagead/js/r20260415/r20110914/elements/html/omrhp_fy2021.js	1209600.0 s	3.3 KiB
syncingbridge.com/userBack?uid=4193634595492512000V10&p=1	0.0 ms	240 B
syncingbridge.com/userBackIframe?uid=4193634595275677000V10&p=1	0.0 ms	232 B
syncingbridge.com/userBackIframe?uid=4193634594229933000V10&p=4	0.0 ms	232 B
/userBackIframe?uid=3572629698321894966&gdpr=%7BGDPR%7D&g...	0.0 ms	229 B
measureadv.com/userBackIframe?uid=&gdpr={GDPR}&gdpr_consent={GDPR_CONSENT}&p=9	0.0 ms	229 B
measureadv.com/userBack?uid=OPTOUT&p=10	0.0 ms	229 B
/ul_cb/server_match?partner_id=1805&gdpr=0&gdpr_consent=&...	0.0 ms	209 B
/pagead/js/r20260415/r20110914/client/window_focus_fy2021.js	1209600.0 s	1.3 KiB
/cm-notify?pi=ogury&gdpr=0&gdpr_consent=us_privacy=%7b%7b...	0.0 ms	124 B
/redir/?partnerid=76&partneruserid=&gdpr=0&gdpr_consent=&...	0.0 ms	113 B
/redir/?partnerid=76&partneruserid=&gdpr=0&gdpr_consent=&...	0.0 ms	113 B
cdn.indexww.com/ht/htw-pixel.gif?0	86400.0 s	246 B
/v.gif?cd=0&a=698824&d=britannica.com&u=DE4F296442B511F3D...	43200.0 s	147 B
/cksync?cs=146&gdpr=0&gdpr_consent=&type=vid&redirect=htt...	0.0 ms	58 B
/api/sync?callerId=5&gdpr=1&gdpr_consent=&us_privacy={{US...	0.0 ms	44 B
/AdServer/ImgSync?p=162110&gdpr=&gdpr_consent=&pu=https%3...	0.0 ms	40 B
/AdServer/ImgSync?p=159706&gdpr=1&gdpr_consent=&us_privac...	0.0 ms	40 B
/AdServer/ImgSync?p=161018&gdpr=0&gdpr_consent=&pu=https%...	0.0 ms	40 B
/hadron.js?url=https%3A%2F%2Fwww.britannica.com%2F&ref=&_...	432000.0 s	186 B
/tr/?id=154643575315468&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	19 B
eus.rubiconproject.com/usync.js	37805.0 s	0 B
eus.rubiconproject.com/usync.js	37805.0 s	0 B
eus.rubiconproject.com/usync.js	37805.0 s	0 B
eus.rubiconproject.com/usync.js	37805.0 s	0 B
eus.rubiconproject.com/usync.js	37805.0 s	0 B
eus.rubiconproject.com/usync.js	37805.0 s	0 B
eus.rubiconproject.com/usync.js	37805.0 s	0 B
eus.rubiconproject.com/usync.js	37805.0 s	0 B
a.amxrtb.com/js/cframe.js#gdpr=0&gdpr_consent=&cc=SG	14400.0 s	0 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.

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/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2	110 ms

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:143.654 source:map[type:text value:[unattributed]]]]

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.grid > div.col-sm-40 > a > img.col-70 `div.grid > div.col-sm-40 > a > img.col-70`	cdn.britannica.com/marketing/Premium-alldevices-white-2026.jpg	312.5 KiB	302.8 KiB
An image of Joy Harjo, a Native American woman, imposed on a background of a no… `div.col-100 > div#vpwpl-video-player-container > div.video-container > img.rounded`	cdn.britannica.com/06/269906-138-C1BB481A/interview-with-writer-joy-harjo.jpg	124.2 KiB	107.3 KiB
head > link `head > link`	s0.2mdn.net/simgad/13900256450594417430	81.5 KiB	70.8 KiB
The Missing Letter `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/missingLetter.png?w=629&h=472&c=crop	40.9 KiB	34.0 KiB
Mother and Young Alaska Sea Otter, Sea otter, Enhydra lutris, Prince William So… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/61/240861-050-F08565E4/Alaska-Sea-Otters-Enhydra-lutris-...	29.4 KiB	23.3 KiB
The Loop - NEW `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/marketing/Loop-promo-4-3.png?w=629&h=472&c=crop	23.7 KiB	19.7 KiB
Civil War era cannon overlooks Kennesaw Mountain National Battle. (military, ar… `div.card > div.card-media > a > img.col-100`	/27/273327-131-76BD5EF0/civil-war-cannon-overlooks-kenees...	24.7 KiB	18.6 KiB
Reunion `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/Reunion4-3Big.png?w=629&h=472&c=crop	23.7 KiB	17.0 KiB
The famous Tunnel View at Yosemite `div.card > div.card-media > a > img.col-100`	/52/236552-131-64AE974F/The-famous-Tunnel-View-at-Yosemit...	22.3 KiB	16.2 KiB
Tightrope `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/tightrope_promo_4_3_2x.webp?w=629&h=472&c=crop	17.8 KiB	14.8 KiB
Revealed `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/revealed-485-364-1x.png?w=629&h=472&c=crop	17.1 KiB	12.2 KiB
Animal-rights protest in Seoul. `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/61/230861-050-CD2052D9/PETA-fur-protest-Myungdong-shoppi...	17.7 KiB	11.6 KiB
The Huajiang Canyon Bridge, the world's highest bridge with a vertical height o… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/07/285907-050-BDA1A788/Huajiang-Canyon-Bridge-Worlds-Hig...	16.3 KiB	10.2 KiB
Collage of people with financial symbols, including a large green clock, house,… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/07/278607-049-30717896/learning-journey-retirement-savin...	16.3 KiB	10.2 KiB
S&P 500 vs. Cboe Volatility Index (VIX) `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/09/265709-050-11F07D26/vix-spikes-and-valleys-graph.jpg?...	13.5 KiB	7.9 KiB
Quordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/quordle.jpeg?w=629&h=472&c=crop	9.2 KiB	7.6 KiB
Victordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/victordle.png?w=629&h=472&c=crop	9.1 KiB	7.5 KiB
Civil rights leader Reverend Martin Luther King, Jr. delivers a speech to a cro… `div.card > div.card-media > a > img.col-100`	/32/232632-131-A2DB4925/King-Speech-at-Sproul-Plaza-in-Be...	12.8 KiB	7.4 KiB
Rex A. Heuermann (2nd from right, dark suit and white shirt) pleads guilty besi… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/81/287081-050-FC6A721B/Rex-Heuermann-pleads-guilty-to-mu...	12.2 KiB	7.1 KiB
Britannica Money `div.grid > div.col-100 > a.gtm-money-cta-logo > img.col-65`	cdn.britannica.com/money/assets/britannica-money-global-nav-logo-250x30-2x.png	8.2 KiB	7.0 KiB
Blossom `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/blossom1x.jpeg?w=629&h=472&c=crop	9.4 KiB	6.7 KiB
The Statue of Unity in Gujarat, India. Dedicated to Sardar Vallabhbhai Patel wh… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/29/240229-050-ADA5E0E5/The-Statue-of-Unity-in-Gujarat-In...	10.6 KiB	6.2 KiB
Child Detective in trench coat and fedora looking at large white footprints wit… `div.card > div.card-media > a > img.col-100`	/51/269951-131-39CF4DBC/child-detective-in-trench-coat-an...	10.5 KiB	6.2 KiB
Photo illustration: Tinker toys arranged in a hub `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/39/264539-159-31C4BE40/Centralized-vs-Decentralized-Cryp...	10.2 KiB	6.0 KiB
Pilfer `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/pilfer.png?w=629&h=472&c=crop	8.3 KiB	6.0 KiB
American Pit Bull Terrier. `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/11/234211-050-2D351D3C/American-pit-bull-terrier.jpg?w=4...	9.8 KiB	5.7 KiB
Animal dissection `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/53/284353-050-24B40CC2/A-dead-frog-being-dissected-under...	9.4 KiB	5.5 KiB
Digital collage of a tiny woman stepping on a calculator key while carrying an … `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/68/274968-159-3B823731/Inflation-Calculator-photo-illust...	8.9 KiB	5.2 KiB
Animal Testing `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/36/230836-050-DBDC2DCC/laboratory-rat.jpg?w=400&h=225&c=crop	7.8 KiB	4.6 KiB
Illustration of Greek god, Athena. Mythology `div.card > div.card-media > a > img.col-100`	/10/261010-131-7EA588C8/Greek-god-Athena-Mythology.jpg?w=...	7.8 KiB	4.5 KiB
Octordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/octordle-4x3.png?w=629&h=472&c=crop	5.9 KiB	4.2 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-31-IMG

nodeLabel: Pyramids of Giza, Cairo, Egypt (desert, pyramid, Egyptian ruins, history, histo…

path: 1,HTML,1,BODY,7,MAIN,0,DIV,0,DIV,1,DIV,5,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,DIV,0,A,0,IMG

selector: div.card > div.card-media > a.position-relative > img.w-100

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.

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

value: No additional origins are good candidates for preconnecting

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
jryhoywlyxnlymahs.ay.delivery/manager/JRyhoywLYXNLYMAhs	34.4 KiB	370 ms
cdn.britannica.com/mendel-resources/3-180/dist/home-page.css?v=3.180.3	1.8 KiB
cdn.britannica.com/mendel-resources/3-180/dist/mendel-css.css?v=3.180.3	30.7 KiB	123 ms
cdn.britannica.com/mendel-resources/3-180/dist/vendor-bundle.css?v=3.180.3	23.0 KiB	123 ms
fonts.googleapis.com/icon?family=Material+Icons	817 B	214 ms
cdn.britannica.com/mendel-resources/3-180/dist/_tailwind.css?v=3.180.3	8.4 KiB	249 ms

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
/cs/usersync.php?gdpr_optin=&gdpr_consent=&us_privacy=&ty...	http/1.1
/cs/usync?idmn=109&type=iframe&id=84417c5e-1f5d-4c7f-a799...	http/1.1
ssp.api.tappx.com/cs/usync?idmn=162&type=iframe&id=OPTOUT&auxuid=	http/1.1
/cs/usync?idmn=sharthrough&id=b3b7f68d-817b-48ed-b5bb-c53...	http/1.1
/cs/usync?idmn=231&type=iframe&id=42d2ee06-b215-4d96-a4dd...	http/1.1
ssp.api.tappx.com/cs/usync?idmn=82&type=iframe&id=a6c83efb8d&auxuid=	http/1.1
ssp.api.tappx.com/cs/usync?idmn=13&type=iframe&id=&auxuid=	http/1.1
/cs/usync?idmn=511&type=iframe&id=149c439a451840bfb658f56...	http/1.1
ssp.api.tappx.com/cs/usync?idmn=999523&type=iframe&id=GDPR&auxuid=	http/1.1
/cs/usync?idmn=241&id=EtEAxgzteXTiuqonu1W9MkwDyPKxPAFjp_7...	http/1.1
ssp.api.tappx.com/cs/usync?idmn=45&id=4374974055011110613&gdpr=0&gdpr_consent=	http/1.1
/cs/usync?idmn=31&type=iframe&id=1bddfb7e-3fbc-41c6-b837-...	http/1.1
/cs/usync?idmn=1083&type=iframe&id=99711950-2873-53ba-bef...	http/1.1
/cs/usync?idmn=869&type=iframe&id=99711950-2873-53ba-befc...	http/1.1
ssp.api.tappx.com/cs/usync?idmn=58&type=iframe&id=213748417047963&auxuid=	http/1.1

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: 957 ms

URL	Time Spent
britannica.com/	957 ms
www.britannica.com/	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

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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

Source: Google web.dev / Lighthouse

Estimated savings: 40 ms 862.7 KiB

URL	Transfer Size	Est Savings
/manager-script/JRyhoywLYXNLYMAhs.deploy?v=qaZ4uJbGiLe4rAGcW	179.7 KiB	99.4 KiB
/pagead/managed/js/gpt/m202604140101/pubads_impl.js?cb=31...	187.7 KiB	92.0 KiB
cdn.confiant-integrations.net/gptprebidnative/202603241056/wrap.js	141.5 KiB	83.3 KiB
cdn.confiant-integrations.net/video/202603241056/wrap.js	125.0 KiB	69.0 KiB
www.googletagmanager.com/gtag/js?id=G-TE6YF92Y0D&cx=c&gtm=4e64f0	175.5 KiB	67.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-KRJ753NG	127.1 KiB	62.2 KiB
/floorPrice/v5/JRyhoywLYXNLYMAhs?t=1776361852869&d=www.br...	54.8 KiB	54.8 KiB
jryhoywlyxnlymahs.ay.delivery/forest/JRyhoywLYXNLYMAhs/js/bid/forest.min.js	56.4 KiB	52.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-5W6NC8	153.6 KiB	50.4 KiB
cdn.britannica.com/mendel-resources/3-180/dist/home-page.js?v=3.180.3	82.5 KiB	41.0 KiB
/ats-modules/84ec2d91-221f-4812-9e59-96237edded0f/ats.js	74.6 KiB	39.0 KiB
connect.facebook.net/en_US/fbevents.js	96.3 KiB	35.5 KiB
/signals/config/154643575315468?v=2.9.298&r=stable&domain...	126.6 KiB	32.0 KiB
b-code.liadm.com/did-0051.min.js	45.5 KiB	31.3 KiB
/floorPrice/v5/JRyhoywLYXNLYMAhs?t=1776361852869&d=www.br...	54.8 KiB	27.4 KiB
jryhoywlyxnlymahs.ay.delivery/manager-script/yield-manager-script-v3.11.1-prod	48.5 KiB	25.8 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.britannica.com/	626 ms	218 ms	42 ms
Unattributable	403 ms	53 ms	0.0 ms
jryhoywlyxnlymahs.ay.delivery/manager-script/yield-manager-script-v3.11.1-prod	382 ms	317 ms	33 ms
cdn.confiant-integrations.net/gptprebidnative/202603241056/wrap.js	283 ms	218 ms	38 ms
jryhoywlyxnlymahs.ay.delivery/client-v2.js	200 ms	186 ms	4.0 ms
www.googletagmanager.com/gtm.js?id=GTM-5W6NC8	198 ms	164 ms	19 ms
scripts.clarity.ms/0.8.59-beta/clarity.js	189 ms	178 ms	2.8 ms
/manager-script/JRyhoywLYXNLYMAhs.deploy?v=qaZ4uJbGiLe4rAGcW	183 ms	153 ms	20 ms
cdn.confiant-integrations.net/video/202603241056/wrap.js	180 ms	168 ms	12 ms
/signals/config/154643575315468?v=2.9.298&r=stable&domain...	163 ms	123 ms	22 ms
c.amazon-adsystem.com/aax2/apstag.js	122 ms	107 ms	12 ms
www.googletagmanager.com/gtag/js?id=G-TE6YF92Y0D&cx=c&gtm=4e64f0	116 ms	95 ms	19 ms
/pagead/managed/js/gpt/m202604140101/pubads_impl.js?cb=31...	108 ms	76 ms	19 ms
static.kueezrtb.com/js/latest_cls.js?_=1776361854946	77 ms	71 ms	2.6 ms
www.googletagmanager.com/gtm.js?id=GTM-KRJ753NG	74 ms	59 ms	14 ms
jryhoywlyxnlymahs.ay.delivery/thirdparty/intentiq/IIQUniversalID-6.24.js	67 ms	61 ms	3.7 ms
cdn.britannica.com/mendel-resources/3-180/dist/home-page.js?v=3.180.3	62 ms	50 ms	9.1 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	2.7 s
Other	540 ms
Script Parsing & Compilation	401 ms
Style & Layout	223 ms
Garbage Collection	66 ms
Rendering	47 ms
Parse HTML & CSS	34 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

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 14.1 KiB

URL	Transfer Size	Est Savings
launchpad.privacymanager.io/latest/launchpad.bundle.js	45.0 KiB	14.1 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: 0.0 ms 39.2 KiB

URL	Transfer Size	Est Savings
cdn.britannica.com/mendel-resources/3-180/dist/vendor-bundle.css?v=3.180.3	22.6 KiB	20.0 KiB
cdn.britannica.com/mendel-resources/3-180/dist/mendel-css.css?v=3.180.3	30.4 KiB	19.1 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
cdn.britannica.com/marketing/Premium-alldevices-white-2026.jpg	307.2 KiB
/pagead/managed/js/gpt/m202604140101/pubads_impl.js?cb=31...	187.7 KiB
/manager-script/JRyhoywLYXNLYMAhs.deploy?v=qaZ4uJbGiLe4rAGcW	180.2 KiB
www.googletagmanager.com/gtag/js?id=G-TE6YF92Y0D&cx=c&gtm=4e64f0	175.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-5W6NC8	153.7 KiB
cdn.confiant-integrations.net/gptprebidnative/202603241056/wrap.js	141.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-KRJ753NG	127.4 KiB
/signals/config/154643575315468?v=2.9.298&r=stable&domain...	126.7 KiB
fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2	125.6 KiB
cdn.confiant-integrations.net/video/202603241056/wrap.js	125.4 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.grid > div.col-sm-40 > a > img.col-70 `div.grid > div.col-sm-40 > a > img.col-70`	cdn.britannica.com/marketing/Premium-alldevices-white-2026.jpg
Pyramids of Giza, Cairo, Egypt (desert, pyramid, Egyptian ruins, history, histo… `div.card > div.card-media > a.position-relative > img.w-100`	/39/155939-050-A709B5D7/Pyramids-Giza-Cairo-Egypt.jpg?w=7...
Quordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/quordle.jpeg?w=629&h=472&c=crop
The Loop - NEW `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/marketing/Loop-promo-4-3.png?w=629&h=472&c=crop
Tightrope `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/tightrope_promo_4_3_2x.webp?w=629&h=472&c=crop
The Missing Letter `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/missingLetter.png?w=629&h=472&c=crop
Victordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/victordle.png?w=629&h=472&c=crop
Reunion `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/Reunion4-3Big.png?w=629&h=472&c=crop
Revealed `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/revealed-485-364-1x.png?w=629&h=472&c=crop
Pilfer `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/pilfer.png?w=629&h=472&c=crop
Twofer Goofer `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/twofer-goofer.png?w=629&h=472&c=crop
Blossom `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/blossom1x.jpeg?w=629&h=472&c=crop
Octordle `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/octordle-4x3.png?w=629&h=472&c=crop
Sudoku `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/kstm/GAME/Sudoku.jpg?w=629&h=472&c=crop
Mother and Young Alaska Sea Otter, Sea otter, Enhydra lutris, Prince William So… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/61/240861-050-F08565E4/Alaska-Sea-Otters-Enhydra-lutris-...
Rex A. Heuermann (2nd from right, dark suit and white shirt) pleads guilty besi… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/81/287081-050-FC6A721B/Rex-Heuermann-pleads-guilty-to-mu...
The Huajiang Canyon Bridge, the world's highest bridge with a vertical height o… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/07/285907-050-BDA1A788/Huajiang-Canyon-Bridge-Worlds-Hig...
The Statue of Unity in Gujarat, India. Dedicated to Sardar Vallabhbhai Patel wh… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/29/240229-050-ADA5E0E5/The-Statue-of-Unity-in-Gujarat-In...
S&P 500 vs. Cboe Volatility Index (VIX) `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/09/265709-050-11F07D26/vix-spikes-and-valleys-graph.jpg?...
Digital collage of a tiny woman stepping on a calculator key while carrying an … `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/68/274968-159-3B823731/Inflation-Calculator-photo-illust...
Photo illustration: Tinker toys arranged in a hub `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/39/264539-159-31C4BE40/Centralized-vs-Decentralized-Cryp...
Collage of people with financial symbols, including a large green clock, house,… `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/07/278607-049-30717896/learning-journey-retirement-savin...
Animal Testing `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	cdn.britannica.com/36/230836-050-DBDC2DCC/laboratory-rat.jpg?w=400&h=225&c=crop
American Pit Bull Terrier. `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/11/234211-050-2D351D3C/American-pit-bull-terrier.jpg?w=4...
Animal-rights protest in Seoul. `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/61/230861-050-CD2052D9/PETA-fur-protest-Myungdong-shoppi...
Animal dissection `div.card-media > a.d-flex > div.tw:w-full > img.tw:w-full`	/53/284353-050-24B40CC2/A-dead-frog-being-dissected-under...
Angkor Wat, Cambodia `div.card > div.card-media > a.position-relative > img.w-100`	/49/94449-050-ECB0E7C2/Angkor-Wat-temple-complex-Cambodia...

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

●Optimize viewport for mobile

●Minify CSS

●User Timing marks and measures 13 user timings

●Avoid long main-thread tasks 18 long tasks found

●Network Requests

●Network Round Trip Times 260 ms

●Server Backend Latencies 1,040 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 100 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○Avoid non-composited animations

Accessibility

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.grid > div.col-sm-40 > a > img.col-70 `div.grid > div.col-sm-40 > a > img.col-70`

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.marketing-HOMEPAGE_BOTTOM_SUBSCRIBE2 > div.grid > div.col-sm-40 > a `div.marketing-HOMEPAGE_BOTTOM_SUBSCRIBE2 > div.grid > div.col-sm-40 > 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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
archaeologists `div.cards3up > div.kic-title-container > div.font-serif > a.md-crosslink`
ancient Egyptian `div.cards3up > div.kic-title-container > div.font-serif > a.md-crosslink`
divine kingship `div.cards3up > div.kic-title-container > div.font-serif > a.md-crosslink`
afterlife `div.cards3up > div.kic-title-container > div.font-serif > a.md-crosslink`
Canada `div.feature-block > div.oyr-title-container > p.font-serif > a.md-crosslink`
Liberal `div.feature-block > div.oyr-title-container > p.font-serif > a.md-crosslink`
Mark Carney `div.feature-block > div.oyr-title-container > p.font-serif > a.md-crosslink`
Benin `div.feature-block > div.oyr-title-container > p.font-serif > a.md-crosslink`
Hungary `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Viktor Orbán `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Péter Magyar `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
European Union `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Peru `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Alberto Fujimori `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
has secured a place in the June 7 runoff `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Ismail Omar Guelleh `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Since he first took office in 1999 `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
strategic location `div.kic-right-rail > div.feature-block > p.font-serif > a.md-crosslink`
Indian statesman `div.card > div.card-body > div.m-0 > a.md-crosslink`

These are opportunities to improve the legibility of your content.

○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>`

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

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

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

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●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

●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.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

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

○Deprecated ARIA roles were not used

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○`[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

○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 buttons have discernible text.

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

○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>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○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
Topics	/manager-script/JRyhoywLYXNLYMAhs.deploy?v=qaZ4uJbGiLe4rAGcW line 11, col 83886
Unload event listeners are deprecated and will be removed.	line 1, col 194
AttributionReporting	connect.facebook.net/en_US/fbevents.js line 279, col 769

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.britannica.com/	`Access to fetch at 'https://rp.liadm.com/j?dtstmp=1776361855327&did=did-0051&se=e30&duid=e85d52b04a00--01kpbpnnpvzzjk29s0s0cavwvk&tv=10.27.0&pu=https%3A%2F%2Fwww.britannica.com%2F&wpn=prebid&cd=.britannica.com' from origin 'https://www.britannica.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
www.britannica.com/	`Access to fetch at 'https://rp.liadm.com/j?dtstmp=1776361855327&did=did-0051&se=e30&duid=e85d52b04a00--01kpbpnnpvzzjk29s0s0cavwvk&tv=10.27.0&pu=https%3A%2F%2Fwww.britannica.com%2F&wpn=prebid&cd=.britannica.com' from origin 'https://www.britannica.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
www.britannica.com/	`Access to fetch at 'https://rp.liadm.com/j?dtstmp=1776361855327&did=did-0051&se=e30&duid=e85d52b04a00--01kpbpnnpvzzjk29s0s0cavwvk&tv=10.27.0&pu=https%3A%2F%2Fwww.britannica.com%2F&wpn=prebid&cd=.britannica.com' from origin 'https://www.britannica.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
www.britannica.com/	`Access to fetch at 'https://rp.liadm.com/j?dtstmp=1776361855327&did=did-0051&se=e30&duid=e85d52b04a00--01kpbpnnpvzzjk29s0s0cavwvk&tv=10.27.0&pu=https%3A%2F%2Fwww.britannica.com%2F&wpn=prebid&cd=.britannica.com' from origin 'https://www.britannica.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
/j?dtstmp=1776361855327&did=did-0051&se=e30&duid=e85d52b0...	`Failed to load resource: net::ERR_FAILED`
/j?dtstmp=1776361855327&did=did-0051&se=e30&duid=e85d52b0...	`Failed to load resource: net::ERR_FAILED`
/j?dtstmp=1776361855327&did=did-0051&se=e30&duid=e85d52b0...	`Failed to load resource: net::ERR_FAILED`
/j?dtstmp=1776361855327&did=did-0051&se=e30&duid=e85d52b0...	`Failed to load resource: net::ERR_FAILED`
/FGMrCMMc/v1?gdpr=&gdpr_consent=&us_privacy=&gpp=&gpp_sid...	`Failed to load resource: the server responded with a status of 422 ()`

●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

●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

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.grid > div.col-sm-40 > a > img.col-70 `div.grid > div.col-sm-40 > a > img.col-70`

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`

Results for https://britannica.com

Site Health

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Top Priorities (5)

Fix Priority Matrix

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What fixing these means

Conversion Barriers

Speed (2)

Trust (2)

Navigation (2)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Payback period

Estimated Remediation Cost

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What Inaction Is Costing You

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Best Practices

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Core Web Vitals

Detailed Report

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Names and labels

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