C — https://ebi.ac.uk | BeaverCheck Audit

Site Health

Score: 75 / 100

Based on 8 categories, 0 sections

Decent speed, but optimizing further could improve engagement.

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.

Reasonable footprint with room for optimization.

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

Alpine.js · 102 peers

You 75

Avg 76

At average

0 50 100

Better than 56% of Alpine.js sites See full Alpine.js benchmark →

Apple · 1227 peers

You 75

Avg 72

At average

0 50 100

Better than 70% of Apple sites See full Apple 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

No <main> landmark found

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

Accessibility › Landmark Structure

34 third-party resources (100% of weight)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Inventory

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%2Febi.ac.uk)](https://beavercheck.com/results/3a486a69-74e1-4e28-ae0e-be80b28c5b46)

HTML

<a href="https://beavercheck.com/results/3a486a69-74e1-4e28-ae0e-be80b28c5b46"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Febi.ac.uk" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Febi.ac.uk

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 4.4s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. 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.

1 accessibility issue excludes users who rely on assistive technology.

Your LCP is 4.4s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.

Conversion Barriers

2 critical 5 warning

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

Speed (1)

Page takes 4.4s to load

+12% bounce

Users abandon at ~3s — you're 1.9s over the 2.5s threshold

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

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

Usability (1)

Layout shifts during page load

+3% bounce

Content movement causes mis-clicks on CTAs and form fields

Fix: Add width/height to images; reserve space for late-loading embeds

Content (1)

Content is hard to read

+2% bounce

Graduate-level reading difficulty — limits the addressable audience for product or blog pages

Fix: Shorten sentences; replace jargon with plain language; target Flesch ease ≥60

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

9 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

£375 investment → £2,611/month returns + GBP 17,550,000 risk avoided

Payback period: < 1 month First-year ROI: +8255%

Investment

£375

5h · 5 findings

Monthly returns

£2,611 /mo

~£31,333 / year

Conversions recovered £2,611
Bandwidth savings £0.25

Regulatory risk avoided

GBP 17,550,000

if kept compliant

UK GDPR GBP 17,500,000
Equality Act 2010 GBP 50,000

Payback period

0 12mo 24mo

£113 — 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

£375

5.0 developer hours at £75/hr

Based on United Kingdom rates (£75/hr)

Quick wins

£113 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

£1,462,500 / month at risk

~£17,550,003 / year if left unfixed

Compliance Risk

£17,550,000

UK GDPREquality Act 2010

Privacy Policy not detected
UK GDPR: GBP 10,000 – GBP 17,500,000
No <main> landmark found
Equality Act 2010: GBP 500 – GBP 50,000
Skip navigation link is missing (WCAG 2.4.1)
Equality Act 2010: GBP 500 – GBP 50,000

+1 more

Bandwidth Waste

£0.25 /mo

3914.9 MB/mo × 0.063 GBP/GB

Optimize transfer: save ~391 KB per page load
Saves £0.25/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 4 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

100

Best Practices

100

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.

3.27 s

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

4.44 s

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

58 ms

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

0.125

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

7.18 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.

6.49 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
/editorhub/wp-content/uploads/2025/04/EMBL-EBI-Data-Centr...	0.0 ms	151.5 KiB
/editorhub/wp-content/uploads/2025/04/EMBL-EBI-30th-anniv...	0.0 ms	135.2 KiB
/editorhub/wp-content/uploads/2025/04/Training-stock-imag...	0.0 ms	95.1 KiB
/v7/https://www.embl.org/editorhub/wp-content/uploads/202...	2278.0 s	91.9 KiB
/v7/www.embl.org/files/wp-content/uploads/EMBL-EBI-home-h...	1139.0 s	51.3 KiB
/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...	0.0 ms	26.5 KiB
/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...	1157.0 s	25.4 KiB
/v7/https://www.embl.org/news/wp-content/uploads/2026/02/...	2430.0 s	24.2 KiB
/v7/https://www.embl.org/news/wp-content/uploads/2026/04/...	887.0 s	14.0 KiB
/v7/www.embl.org/files/wp-content/uploads/Screenshot-2021...	3241.0 s	11.7 KiB
/v7/https://www.embl.org/files/wp-content/uploads/2020/04...	158.0 s	8.5 KiB
ebi.emblstatic.net/web_guidelines/EBI-Framework/v1.4/js/script.js	86400.0 s	11.2 KiB
/web_guidelines/EBI-Icon-fonts/v1.3/EBI-Generic/fonts/EBI...	86400.0 s	10.8 KiB
assets.emblstatic.net/vf/v2.5.24/assets/ebi-header-footer/ebi-header-footer.css	3600.0 s	4.1 KiB
ebi.emblstatic.net/web_guidelines/EBI-Icon-fonts/v1.3/fonts.css	86400.0 s	8.0 KiB

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:0.124559] map[node:map[boundingRect:map[bottom:2815 height:384 left:0 right:412 top:2431 width:412] lhId:page-3-::before nodeLabel:body.vf-body > section.vf-hero > ::before path:1,HTML,1,BODY,7,SECTION,0,::before selector:body.vf-body > section.vf-hero > ::before snippet:<::before> type:node] score:0.059659] map[node:map[boundingRect:map[bottom:2815 height:384 left:0 right:412 top:2431 width:412] lhId:page-3-::before nodeLabel:body.vf-body > section.vf-hero > ::before path:1,HTML,1,BODY,7,SECTION,0,::before selector:body.vf-body > section.vf-hero > ::before snippet:<::before> type:node] score:0.040048] map[node:map[boundingRect:map[bottom:733 height:344 left:0 right:412 top:389 width:412] lhId:page-1-::before nodeLabel:body.vf-body > section.vf-card-container > ::before path:1,HTML,1,BODY,5,SECTION,0,::before selector:body.vf-body > section.vf-card-container > ::before snippet:<::before> type:node] score:0.015584] map[node:map[boundingRect:map[bottom:1126 height:54 left:16 right:396 top:1072 width:380] lhId:page-5-H3 nodeLabel:Unlocking the value of biodiversity in the UK and Ireland path:1,HTML,1,BODY,6,SECTION,1,DIV,0,DIV,1,ARTICLE,2,H3 selector:div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > h3.vf-summary__title snippet:<h3 class="vf-summary__title"> type:node] score:0.008969] map[node:map[boundingRect:map[bottom:174 height:53 left:32 right:380 top:121 width:348] lhId:page-13-H1 nodeLabel:EMBL-EBI path:1,HTML,1,BODY,4,SECTION,0,DIV,1,H1 selector:body.vf-body > section.ebi-homepage-search > div.vf-hero__content > h1.vf-hero__heading snippet:<h1 class="vf-hero__heading"> type:node] score:0.000168]]

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
/assets/vf-font-plex-sans/assets/IBM-Plex-Sans/fonts/comp...	1.2 s
/assets/vf-font-plex-sans/assets/IBM-Plex-Sans/fonts/comp...	1.1 s
/assets/vf-font-plex-sans/assets/IBM-Plex-Sans/fonts/comp...	835 ms
/assets/vf-font-plex-sans/assets/IBM-Plex-Sans/fonts/comp...	690 ms
/web_guidelines/EBI-Icon-fonts/v1.3/EBI-Generic/fonts/EBI...	15 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

items: [map[reflowTime:32.258 source:map[type:text value:[unattributed]]]]

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:2861.065 label:Time to first byte subpart:timeToFirstByte] map[duration:1052.305 label:Resource load delay subpart:resourceLoadDelay] map[duration:21.354 label:Resource load duration subpart:resourceLoadDuration] map[duration:40.506 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-SECTION

nodeLabel: EMBL's European Bioinformatics Institute EMBL-EBI Unleashing the potential of…

path: 1,HTML,1,BODY,4,SECTION

selector: body.vf-body > section.ebi-homepage-search

snippet: <section class="ebi-homepage-search vf-hero vf-hero--800 vf-hero--search | vf-u-fullbleed" data-vf-google-analytics-region="homepage-search" style="--vf-hero--bg-image: url('https://acxngcvroo.cloudimg.io/v7/www.embl.org/f…;">

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-SECTION

nodeLabel: EMBL's European Bioinformatics Institute EMBL-EBI Unleashing the potential of…

path: 1,HTML,1,BODY,4,SECTION

selector: body.vf-body > section.ebi-homepage-search

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

title: Preconnected origins

value: no origins were preconnected

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

title: Preconnect candidates

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
www.ebi.ac.uk/css/styles.css?	25.3 KiB	353 ms
assets.emblstatic.net/vf/v2.5.24/assets/ebi-header-footer/ebi-header-footer.css	4.1 KiB	802 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
div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image `div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image`	/editorhub/wp-content/uploads/2025/04/EMBL-EBI-Data-Centr...	151.1 KiB	103.0 KiB
div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image `div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image`	/editorhub/wp-content/uploads/2025/04/EMBL-EBI-30th-anniv...	134.8 KiB	86.9 KiB
div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image `div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image`	/editorhub/wp-content/uploads/2025/04/Training-stock-imag...	94.6 KiB	46.5 KiB

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 830 ms

URL	Time Spent
ebi.ac.uk/	830 ms
www.ebi.ac.uk/	0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.0 s

URL	Time Spent
www.ebi.ac.uk/	2.1 s

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
body.vf-body > section.vf-hero > ::before `body.vf-body > section.vf-hero > ::before`	0.060
body.vf-body > section.vf-hero > ::before `body.vf-body > section.vf-hero > ::before`	0.040
body.vf-body > section.vf-card-container > ::before `body.vf-body > section.vf-card-container > ::before`	0.016
Unlocking the value of biodiversity in the UK and Ireland `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > h3.vf-summary__title`	0.009
EMBL-EBI `body.vf-body > section.ebi-homepage-search > div.vf-hero__content > h1.vf-hero__heading`	0.000
div.vf-card__content > h3.vf-card__heading > a.vf-card__link > svg.vf-card__heading__icon `div.vf-card__content > h3.vf-card__heading > a.vf-card__link > svg.vf-card__heading__icon`	0.000
	0.000

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

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: 150 ms 25.0 KiB

URL	Transfer Size	Est Savings
www.ebi.ac.uk/scripts/scripts.js?	39.8 KiB	16.0 KiB
cdnjs.cloudflare.com/ajax/libs/alpinejs/3.10.2/cdn.js	18.1 KiB	5.0 KiB
ebi.emblstatic.net/web_guidelines/EBI-Framework/v1.4/js/script.js	10.8 KiB	4.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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 20.7 KiB

URL	Transfer Size	Est Savings
www.ebi.ac.uk/css/styles.css?	25.2 KiB	20.7 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: 0.0 ms 90.3 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-DGQJ9J085B	158.2 KiB	65.7 KiB
www.ebi.ac.uk/scripts/scripts.js?	39.8 KiB	24.6 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/04/...
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/02/...
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...
div > div.vf-content > figure.vf-figure > img.vf-figure__image `div > div.vf-content > figure.vf-figure > img.vf-figure__image`	/v7/https://www.embl.org/files/wp-content/uploads/2020/04...

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

●Max Potential First Input Delay 110 ms

●Optimize DOM size

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Avoids enormous network payloads Total size was 1,274 KiB

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.4 s

●Minimizes main-thread work 1.0 s

●Avoid long main-thread tasks 3 long tasks found

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 810 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

○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.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
SERVICES `div.vf-footer__inner > div.vf-footer__links-group > div.vf-links > h4.vf-links__heading`

These are opportunities to improve keyboard navigation in your application.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html.vf-js `html.vf-js`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●Buttons have an accessible name

●Image elements have `[alt]` attributes

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

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

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

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

●Links are distinguishable without relying on color.

●Links have a discernible name

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

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

●Touch targets have sufficient size and spacing.

○`[accesskey]` values are unique

○`[aria-*]` attributes match their roles

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

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

○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

○Elements use only permitted ARIA attributes

○`[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

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

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

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

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

○Input buttons have discernible text.

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

○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

○`<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.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

100

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.

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

100

Best Practices

100

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.

829 ms

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

1.02 s

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

0 ms

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

0.129

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

829 ms

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

1.02 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
/editorhub/wp-content/uploads/2025/04/EMBL-EBI-Data-Centr...	0.0 ms	151.6 KiB
/editorhub/wp-content/uploads/2025/04/EMBL-EBI-30th-anniv...	0.0 ms	135.4 KiB
/editorhub/wp-content/uploads/2025/04/Training-stock-imag...	0.0 ms	94.9 KiB
/v7/https://www.embl.org/editorhub/wp-content/uploads/202...	2262.0 s	91.9 KiB
/v7/www.embl.org/files/wp-content/uploads/EMBL-EBI-home-h...	1123.0 s	51.3 KiB
/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...	0.0 ms	26.5 KiB
/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...	1141.0 s	25.4 KiB
/v7/https://www.embl.org/news/wp-content/uploads/2026/02/...	2414.0 s	24.2 KiB
/v7/https://www.embl.org/news/wp-content/uploads/2026/04/...	871.0 s	14.0 KiB
/v7/www.embl.org/files/wp-content/uploads/Screenshot-2021...	3225.0 s	11.7 KiB
/v7/https://www.embl.org/files/wp-content/uploads/2020/04...	141.0 s	8.4 KiB
ebi.emblstatic.net/web_guidelines/EBI-Framework/v1.4/js/script.js	86400.0 s	11.2 KiB
/web_guidelines/EBI-Icon-fonts/v1.3/EBI-Generic/fonts/EBI...	86400.0 s	10.8 KiB
assets.emblstatic.net/vf/v2.5.24/assets/ebi-header-footer/ebi-header-footer.css	3600.0 s	4.1 KiB
ebi.emblstatic.net/web_guidelines/EBI-Icon-fonts/v1.3/fonts.css	86400.0 s	8.0 KiB
/web_guidelines/EBI-Framework/v1.3/images/logos/EMBL-EBI/...	86400.0 s	1.2 KiB

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.

items: [map[node:map[type:text value:Total] score:0.128762] map[node:map[boundingRect:map[bottom:1192 height:278 left:0 right:1350 top:915 width:1350] lhId:page-1-::before nodeLabel:body.vf-body > section.vf-hero > ::before path:1,HTML,1,BODY,7,SECTION,0,::before selector:body.vf-body > section.vf-hero > ::before snippet:<::before> type:node] score:0.052268] map[node:map[boundingRect:map[bottom:1192 height:278 left:0 right:1350 top:915 width:1350] lhId:page-1-::before nodeLabel:body.vf-body > section.vf-hero > ::before path:1,HTML,1,BODY,7,SECTION,0,::before selector:body.vf-body > section.vf-hero > ::before snippet:<::before> type:node] score:0.048723] map[node:map[boundingRect:map[bottom:1192 height:278 left:0 right:1350 top:915 width:1350] lhId:page-1-::before nodeLabel:body.vf-body > section.vf-hero > ::before path:1,HTML,1,BODY,7,SECTION,0,::before selector:body.vf-body > section.vf-hero > ::before snippet:<::before> type:node] score:0.025431] map[node:map[boundingRect:map[bottom:1456 height:231 left:35 right:1315 top:1224 width:1280] lhId:page-4-SECTION nodeLabel:EMBL-EBI Training events 27 Apr 2026 - 01 May 2026 Introduction to metabolomi… path:1,HTML,1,BODY,8,SECTION selector:body.vf-body > section.vf-summary-container snippet:<section class="vf-summary-container" style="--vf-stack-margin--custom: 4rem;" data-vf-google-analytics-region="home-events"> type:node] score:0.001845] map[node:map[boundingRect:map[bottom:35 height:35 left:496 right:654 top:0 width:158] lhId:page-10-LI nodeLabel:EMBL-EBI home path:1,HTML,1,BODY,3,HEADER,1,DIV,0,NAV,0,UL,6,LI selector:div > nav.row > ul#global-nav > li.where snippet:<li class="where ebi"> type:node] score:0.000495]]

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
/assets/vf-font-plex-sans/assets/IBM-Plex-Sans/fonts/comp...	85 ms
/assets/vf-font-plex-sans/assets/IBM-Plex-Sans/fonts/comp...	75 ms
/assets/vf-font-plex-sans/assets/IBM-Plex-Sans/fonts/comp...	70 ms
/assets/vf-font-plex-sans/assets/IBM-Plex-Sans/fonts/comp...	60 ms
/web_guidelines/EBI-Icon-fonts/v1.3/EBI-Generic/fonts/EBI...	15 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:30.874 source:map[type:text value:[unattributed]]]]

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-SECTION

nodeLabel: EMBL-EBI Highlights report Explore our latest achievements and how open data a…

path: 1,HTML,1,BODY,7,SECTION

selector: body.vf-body > section.vf-hero

snippet: <section class="vf-hero | vf-u-fullbleed" style="--vf-hero--bg-image: url('https://acxngcvroo.cloudimg.io/v7/https://www.em…;" data-vf-google-analytics-region="home-featured">

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

value: no origins were preconnected

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

title: Preconnect candidates

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
assets.emblstatic.net/vf/v2.5.24/assets/ebi-header-footer/ebi-header-footer.css	4.1 KiB	252 ms
www.ebi.ac.uk/css/styles.css?	25.3 KiB	133 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
div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image `div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image`	/editorhub/wp-content/uploads/2025/04/EMBL-EBI-Data-Centr...	151.1 KiB	133.3 KiB
div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image `div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image`	/editorhub/wp-content/uploads/2025/04/EMBL-EBI-30th-anniv...	134.8 KiB	117.0 KiB
div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image `div.vf-card-container > div.vf-card-container__inner > article.vf-card > img.vf-card__image`	/editorhub/wp-content/uploads/2025/04/Training-stock-imag...	94.6 KiB	76.8 KiB
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...	26.5 KiB	20.0 KiB
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...	25.3 KiB	19.2 KiB
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/02/...	24.2 KiB	18.3 KiB
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/04/...	14.0 KiB	10.6 KiB

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

Diagnostics

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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 25.0 KiB

URL	Transfer Size	Est Savings
www.ebi.ac.uk/scripts/scripts.js?	39.8 KiB	16.0 KiB
cdnjs.cloudflare.com/ajax/libs/alpinejs/3.10.2/cdn.js	18.1 KiB	5.0 KiB
ebi.emblstatic.net/web_guidelines/EBI-Framework/v1.4/js/script.js	10.8 KiB	4.1 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 20.4 KiB

URL	Transfer Size	Est Savings
www.ebi.ac.uk/css/styles.css?	25.2 KiB	20.4 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 ▾

Source: Google web.dev / Lighthouse

Estimated savings: 0.0 ms 89.9 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-DGQJ9J085B	158.2 KiB	65.3 KiB
www.ebi.ac.uk/scripts/scripts.js?	39.8 KiB	24.6 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/04/...
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/02/...
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...
News image `div.vf-section-content > div.embl-content-hub-loader > article.vf-summary > img.vf-summary__image`	/v7/https://www.embl.org/news/wp-content/uploads/2026/03/...
div > div.vf-content > figure.vf-figure > img.vf-figure__image `div > div.vf-content > figure.vf-figure > img.vf-figure__image`	/v7/https://www.embl.org/files/wp-content/uploads/2020/04...

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

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: 278 ms

URL	Time Spent
ebi.ac.uk/	278 ms
www.ebi.ac.uk/	0.0 ms

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
body.vf-body > section.vf-hero > ::before `body.vf-body > section.vf-hero > ::before`	0.052
body.vf-body > section.vf-hero > ::before `body.vf-body > section.vf-hero > ::before`	0.049
body.vf-body > section.vf-hero > ::before `body.vf-body > section.vf-hero > ::before`	0.025
EMBL-EBI Training events 27 Apr 2026 - 01 May 2026 Introduction to metabolomi… `body.vf-body > section.vf-summary-container`	0.002
EMBL-EBI home `div > nav.row > ul#global-nav > li.where`	0.000

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 1.0 s

●Max Potential First Input Delay 30 ms

●Minify CSS

●Avoids enormous network payloads Total size was 1,276 KiB

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.1 s

●Minimizes main-thread work 0.3 s

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 20 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 40 ms

○INP breakdown

○Avoid long main-thread tasks

○Avoid non-composited animations

Accessibility

Navigation

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
SERVICES `div.vf-footer__inner > div.vf-footer__links-group > div.vf-links > h4.vf-links__heading`

These are opportunities to improve keyboard navigation in your application.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html.vf-js `html.vf-js`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

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

●Select elements have associated label elements.

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

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

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

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

●Links are distinguishable without relying on color.

●Links have a discernible name

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

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

●Touch targets have sufficient size and spacing.

○`[accesskey]` values are unique

○`[aria-*]` attributes match their roles

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

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

○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

○Elements use only permitted ARIA attributes

○`[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

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

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

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

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

○Input buttons have discernible text.

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

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

○`<object>` elements have alternate text

○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

○`<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.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

100

SEO

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Results for https://ebi.ac.uk

Site Health

How you compare

Top Priorities (5)

Fix Priority Matrix

Quick Wins

Strategic

Easy Improvements

Deprioritize

What fixing these means

Conversion Barriers

Speed (1)

Trust (2)

Usability (1)

Content (1)

Navigation (2)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Payback period

Estimated Remediation Cost

Cost by category

Cost by effort level

What Inaction Is Costing You

Compliance Risk

Bandwidth Waste

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Navigation

Best practices

Best Practices

SEO

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Navigation

Best practices

Best Practices

SEO

Keyboard Shortcuts