Singapore · Singapore Completed: Apr 22, 2026 21:06 UTCMobile 375 × 812
Desktop 1440 × 900
Score: 70 / 100
Based on 8 categories, 0 sections
Decent speed, but optimizing further could improve engagement.
Several missing protections leave your users and data exposed.
Major barriers for users with disabilities — up to 15% of your audience.
Well-optimized for search — your content is discoverable.
Good server performance with room for optimization.
Mostly compliant — a few items need attention.
Good content signals with minor gaps.
Heavier than average — reducing page weight saves energy and bandwidth.
The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.
Weights reflect general web best practices. Individual needs may differ.
Content-Security-Policy header is missing
Security gaps expose your site and users to attacks, eroding trust.
No Content-Security-Policy header found
Security gaps expose your site and users to attacks, eroding trust.
Page weighs 5.9 MB (5.1 MB transferred)
Performance issues directly impact user engagement and conversion rates.
12 link(s) with no accessible text
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
2 image(s) missing alt attribute
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
High impact, low effort — start here.
High impact, requires investment.
Small gains, minimal effort.
Nothing in this quadrant — good news.
Low impact, high effort — do last.
Nothing in this quadrant — good news.
[](https://beavercheck.com/results/0d879546-25da-4d88-856c-4e386d9b402b)<a href="https://beavercheck.com/results/0d879546-25da-4d88-856c-4e386d9b402b"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Feso.org" alt="BeaverCheck Score"></a>https://beavercheck.com/badge?url=https%3A%2F%2Feso.orgThis badge auto-updates with your latest scan result.
Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 13.7s 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.
9 barrier(s) likely increasing bounce by ~32%.
Page takes 13.7s to load
+12% bounceUsers abandon at ~3s — you're 11.2s over the 2.5s threshold
Fix: Optimize render-blocking resources, preload the hero image, and compress images
No HSTS header
+1% bounceReturning 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% bounceHigher XSS blast radius — one compromised script can exfiltrate the checkout form
Fix: Ship a reporting-only CSP first, then enforce once violations are clean
Severe layout shift during page load
+6% bounceUsers mis-click when content jumps — converting intent into frustration
Fix: Reserve space for images, ads, and embeds with explicit width/height
No structured data
+2% bounceNo rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices
Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)
Content is hard to read
+2% bounceGraduate-level reading difficulty — limits the addressable audience for product or blog pages
Fix: Shorten sentences; replace jargon with plain language; target Flesch ease ≥60
12 link(s) with generic text ("click here", "read more")
+1% bounceScreen-reader users navigating by link list see no context — and search engines can't infer relevance
Fix: Rewrite with descriptive phrases that identify the destination
No skip-to-content link
+1% bounceKeyboard 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% bounceClicks 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.
€540 investment → €1,075/month returns + EUR 120,500,000 risk avoided
€540
6h · 5 findings
€1,075 /mo
~€12,896 / year
EUR 120,500,000
if kept compliant
€90 — 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.
6.0 developer hours at €90/hr
Based on Germany rates (€90/hr)
Start here for the best return on investment
€10,041,668 / month at risk
~€120,500,014 / year if left unfixed
€120,500,000
+9 more
€1.18 /mo
15981.6 MB/mo × 0.074 EUR/GB
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.
Unique monthly visitors from your analytics
Purchases, signups, or key actions
Optional — for revenue estimation
more engaged visitors from reduced bounce
Fix 5 critical issues to capture this value
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
Your data stays in your browser — nothing is sent to our servers
Thanks for your feedback!
We'll use a cached audit if available, or offer to scan.
Industry-standard audits powered by Google Lighthouse.
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.
3.37 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
13.72 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
95 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.912
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.45 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.
13.91 s
Audit breakdown by category with detailed findings.
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
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
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
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.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
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.
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
Largest ALMA image ever shows the molecular gas in the centre of the Milky Way div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2603a.jpg | 607.0 KiB | 567.3 KiB |
The RCW 94/95 nebulae in visible and infrared light div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2518a.jpg | 505.3 KiB | 465.6 KiB |
Aiming at a cosmic tarantula div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/potw2616a.jpg | 345.7 KiB | 336.0 KiB |
Cerro Paranal and the Milky Way above it div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/_DSC7159-CC.jpg | 345.4 KiB | 305.8 KiB |
CTAO-South time-capsule monument unveiling div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2521a.jpg | 340.4 KiB | 300.8 KiB |
El Presidente de la República Checa y el Ministro de Relaciones Exteriores de C… div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/annlang26005a-es-cl.jpg | 274.6 KiB | 264.9 KiB |
In search of our Cosmic Origins div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/alma.jpg | 253.8 KiB | 238.9 KiB |
The PoET main telescope div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2605a.jpg | 235.4 KiB | 202.2 KiB |
The world’s most advanced visible-light astronomical observatory div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/vlt.jpg | 211.2 KiB | 196.3 KiB |
Four lasers for the VLTI div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2519a.jpg | 213.9 KiB | 183.8 KiB |
Andreas Kaufer at Paranal div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2517a.jpg | 194.5 KiB | 167.0 KiB |
VLT images of two planets forming around the young star WISPIT 2 div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2604a.jpg | 161.1 KiB | 138.3 KiB |
ESO’s first observatory div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/lasilla.jpg | 138.4 KiB | 123.5 KiB |
VLT image of a dead star creating a shock wave as it moves through space div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2601a.jpg | 127.8 KiB | 109.8 KiB |
The World’s Biggest Eye on the Sky div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/elt.jpg | 117.4 KiB | 102.5 KiB |
Inside the world's largest telescope: it's progressing fast! div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/videos/small169/cs0027a.jpg | 94.1 KiB | 84.4 KiB |
Taxi, please! div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/potw2615a.jpg | 80.4 KiB | 70.7 KiB |
div.social-links-container > div.social-icons-container > a > div.sprites-mastodon_white div.social-links-container > div.social-icons-container > a > div.sprites-mastodon_white | www.eso.org/public/archives/djp/sprites/sprites.73991e10bd47.png | 87.2 KiB | 56.7 KiB |
Artist’s impression of the initial shape of a supernova explosion div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2520a.jpg | 64.1 KiB | 55.0 KiB |
Tour nocturno en Observatorio Paranal div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/annlang26004a-es-cl.jpg | 58.9 KiB | 49.2 KiB |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img | cdn.eso.org/images/thumb350x/eso50_obs_compo.jpg | 22.5 KiB | 11.5 KiB |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img | cdn.eso.org/images/thumb350x/2018_04_17_es_moon-venus_4-cc.jpg | 18.3 KiB | 7.3 KiB |
Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| www.eso.org/public/archives/djp/css/main.01d86ad5297f.css | 77.7 KiB | 977 ms |
| /t/1.css?apiType=css&projectid=03892b9b-79f6-4f01-9746-af... | 637 B | 784 ms |
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| eso.org/ | 1.3 s |
| www.eso.org/public/ | 0.0 ms |
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
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
Our Stories
All
Press Releases
Announcements
Pictures of the Week
Blog Posts
Vi… body > div#content > div#body | 0.577 |
Our Stories
All
Press Releases
Announcements
Pictures of the Week
Blog Posts
Vi… body > div#content > div#body | 0.210 |
Our Stories
All
Press Releases
Announcements
Pictures of the Week
Blog Posts
Vi… body > div#content > div#body | 0.106 |
Our Stories
All
Press Releases
Announcements
Pictures of the Week
Blog Posts
Vi… body > div#content > div#body | 0.018 |
Science User Portal body > nav.navbar-general-wrapper > div.navbar-general > div.sections | 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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.eso.org/public/archives/djp/css/main.01d86ad5297f.css | 77.4 KiB | 70.9 KiB |
| www.eso.org/public/archives/djp/css/extras.d3e54451ebbb.css | 13.5 KiB | 13.2 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.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
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
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.eso.org/public/archives/djp/js/main.bf52206884ae.js | 194.6 KiB | 146.0 KiB |
| www.eso.org/mtmo/matomo.js | 65.9 KiB | 38.5 KiB |
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
Performance issues directly impact user engagement and conversion rates.
| Category | Time Spent |
|---|---|
| Style & Layout | 895 ms |
| Other | 801 ms |
| Script Evaluation | 377 ms |
| Rendering | 227 ms |
| Script Parsing & Compilation | 119 ms |
| Parse HTML & CSS | 90 ms |
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.eso.org/public/archives/djp/css/main.01d86ad5297f.css | 77.7 KiB | 12.8 KiB |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
Andreas Kaufer at Paranal div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2517a.jpg |
The PoET main telescope div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2605a.jpg |
VLT images of two planets forming around the young star WISPIT 2 div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2604a.jpg |
Largest ALMA image ever shows the molecular gas in the centre of the Milky Way div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2603a.jpg |
Cerro Paranal and the Milky Way above it div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/_DSC7159-CC.jpg |
VLT image of a dead star creating a shock wave as it moves through space div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2601a.jpg |
CTAO-South time-capsule monument unveiling div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2521a.jpg |
Artist’s impression of the initial shape of a supernova explosion div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2520a.jpg |
Four lasers for the VLTI div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2519a.jpg |
The RCW 94/95 nebulae in visible and infrared light div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2518a.jpg |
Andreas Kaufer at Paranal div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2517a.jpg |
The PoET main telescope div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2605a.jpg |
Inside the world's largest telescope: it's progressing fast! div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/videos/small169/cs0027a.jpg |
El Presidente de la República Checa y el Ministro de Relaciones Exteriores de C… div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/annlang26005a-es-cl.jpg |
Aiming at a cosmic tarantula div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/potw2616a.jpg |
Taxi, please! div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/potw2615a.jpg |
Tour nocturno en Observatorio Paranal div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/annlang26004a-es-cl.jpg |
The World’s Biggest Eye on the Sky div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/elt.jpg |
In search of our Cosmic Origins div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/alma.jpg |
The world’s most advanced visible-light astronomical observatory div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/vlt.jpg |
ESO’s first observatory div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/lasilla.jpg |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img | cdn.eso.org/images/thumb350x/2018_04_17_es_moon-venus_4-cc.jpg |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img | cdn.eso.org/images/thumb350x/eso50_obs_compo.jpg |
More information about the performance of your application. These numbers don't directly affect the Performance score.
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.
Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
ESO2517 — PRESS RELEASE
Andreas Kaufer appointed as next ESO Director General
T… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2604 — PRESS RELEASE
A Solar System in the making? Two planets spotted formi… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2603 — PRESS RELEASE
Largest image of its kind shows hidden chemistry at the… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2602 — PRESS RELEASE
AES Andes announces cancellation of INNA, the industria… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2601 — PRESS RELEASE
Astronomers surprised by mysterious shock wave around d… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2521 — PRESS RELEASE
Construction begins on the first and largest gamma-ray … div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2520 — PRESS RELEASE
Unique shape of star’s explosion revealed just a day af… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2519 — PRESS RELEASE
Laser trial run kickstarts new era of interferometry
La… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2518 — PRESS RELEASE
New image captures spooky bat signal in the sky
A spook… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2517 — PRESS RELEASE
Andreas Kaufer appointed as next ESO Director General
T… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2605 — PRESS RELEASE
First light for PoET: shining (sun)light on exoplanet r… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
nav.navbar-general-wrapper > div.navbar-general > div.searchbox > button#searchbox-button nav.navbar-general-wrapper > div.navbar-general > div.searchbox > button#searchbox-button |
div.form-group > div.input-group > span.input-group-btn > button.btn div.form-group > div.input-group > span.input-group-btn > button.btn |
div#content > div#pr-carousel-wrapper > div#pr-carousel > button.slide-prev div#content > div#pr-carousel-wrapper > div#pr-carousel > button.slide-prev |
div#content > div#pr-carousel-wrapper > div#pr-carousel > button.slide-next div#content > div#pr-carousel-wrapper > div#pr-carousel > button.slide-next |
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img |
Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div#content > div.privacy-settings > ul.ul-privacy > a div#content > div.privacy-settings > ul.ul-privacy > a |
div.privacy-settings > ul.ul-privacy > li > a div.privacy-settings > ul.ul-privacy > li > 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.
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Press Releases div#body > div.title-categories > div.story-categories > span.story-category |
Announcements div#body > div.title-categories > div.story-categories > span.story-category |
Pictures of the Week div#body > div.title-categories > div.story-categories > span.story-category |
Blog Posts div#body > div.title-categories > div.story-categories > span.story-category |
Videos div#body > div.title-categories > div.story-categories > span.story-category |
13 Mar 2026 — cs0027a div.story-container > a > div.story-description > div.date |
20 Apr 2026 — annlang26005-es-cl-en div.story-container > a > div.story-description > div.date |
20 Apr 2026 — potw2616 div.story-container > a > div.story-description > div.date |
13 Apr 2026 — potw2615 div.story-container > a > div.story-description > div.date |
10 Apr 2026 — annlang26004-es-cl-en div.story-container > a > div.story-description > div.date |
More... div.stories-container > div.story-container > div.story-more-container > span.story-more |
Send us your comments! div#content > div.footernote > div > a |
Subscribe to receive news from ESO in your language div#content > div.footernote > div > a |
Accelerated by CDN77 div#content > div.footernote > div > a |
Terms & Conditions div#content > div.footernote > div > a |
Cookie Settings and Policy div#content > div.footernote > div > span.footer-privacy-settings-link |
OFF div.cookies-table-row-choice > div.cookies-table-cell > div.privacy-setting-toggle > span.privacy-option |
OFF div.cookies-table-row-choice > div.cookies-table-cell > div.privacy-setting-toggle > span.privacy-option |
OFF div#content > div.privacy-settings > div.privacy-setting-toggle > span.privacy-option |
These are opportunities to improve the legibility of your content.
Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Brave
Chrome
Edge
Firefox
Safari body > div#content > div.privacy-settings > ul.ul-privacy |
These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Brave div.privacy-settings > ul.ul-privacy > li > a |
Chrome div.privacy-settings > ul.ul-privacy > li > a |
Edge div.privacy-settings > ul.ul-privacy > li > a |
Firefox div.privacy-settings > ul.ul-privacy > li > a |
Safari div.privacy-settings > ul.ul-privacy > li > a |
One main landmark helps screen reader users navigate a web page. Learn more about landmarks.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
html html |
These items highlight common accessibility best practices.
Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.
Performance issues directly impact user engagement and conversion rates.
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.
Descriptive link text helps search engines understand your content. Learn how to make links more accessible.
Performance issues directly impact user engagement and conversion rates.
| Link destination | Link Text |
|---|---|
| www.eso.org/public/shopinfo/ | Information |
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img |
Format your HTML in a way that enables crawlers to better understand your app’s content.
Industry-standard audits powered by Google Lighthouse. — Desktop
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.
1.50 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.29 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.
0.303
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.43 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.
3.31 s
Audit breakdown by category with detailed findings.
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
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
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
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.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
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.
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
Largest ALMA image ever shows the molecular gas in the centre of the Milky Way div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2603a.jpg | 607.0 KiB | 467.9 KiB |
Aiming at a cosmic tarantula div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/potw2616a.jpg | 345.7 KiB | 337.1 KiB |
El Presidente de la República Checa y el Ministro de Relaciones Exteriores de C… div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/annlang26005a-es-cl.jpg | 274.6 KiB | 266.0 KiB |
In search of our Cosmic Origins div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/alma.jpg | 253.8 KiB | 246.7 KiB |
Cerro Paranal and the Milky Way above it div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/_DSC7159-CC.jpg | 345.4 KiB | 206.4 KiB |
The world’s most advanced visible-light astronomical observatory div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/vlt.jpg | 211.2 KiB | 204.1 KiB |
ESO’s first observatory div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/lasilla.jpg | 138.4 KiB | 131.2 KiB |
The PoET main telescope div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2605a.jpg | 235.4 KiB | 119.0 KiB |
The World’s Biggest Eye on the Sky div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/elt.jpg | 117.4 KiB | 110.3 KiB |
Andreas Kaufer at Paranal div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2517a.jpg | 194.5 KiB | 98.3 KiB |
Inside the world's largest telescope: it's progressing fast! div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/videos/small169/cs0027a.jpg | 94.1 KiB | 85.5 KiB |
VLT images of two planets forming around the young star WISPIT 2 div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2604a.jpg | 161.1 KiB | 81.4 KiB |
Taxi, please! div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/potw2615a.jpg | 80.4 KiB | 71.8 KiB |
div#eso-logo-wrapper > div.eso-logo > a > div.sprites-esologo div#eso-logo-wrapper > div.eso-logo > a > div.sprites-esologo | www.eso.org/public/archives/djp/sprites/sprites.73991e10bd47.png | 87.2 KiB | 56.7 KiB |
Tour nocturno en Observatorio Paranal div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/annlang26004a-es-cl.jpg | 58.9 KiB | 50.3 KiB |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img | cdn.eso.org/images/thumb350x/eso50_obs_compo.jpg | 22.5 KiB | 12.8 KiB |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img | cdn.eso.org/images/thumb350x/2018_04_17_es_moon-venus_4-cc.jpg | 18.3 KiB | 8.5 KiB |
Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| www.eso.org/public/archives/djp/css/main.01d86ad5297f.css | 77.7 KiB | 313 ms |
| /t/1.css?apiType=css&projectid=03892b9b-79f6-4f01-9746-af... | 636 B | 222 ms |
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| eso.org/ | 742 ms |
| www.eso.org/public/ | 0.0 ms |
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
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
Our Stories
All
Press Releases
Announcements
Pictures of the Week
Blog Posts
Vi… body > div#content > div#body | 0.301 |
TELESCOPES & INSTRUMENTS nav.main-menu-wrapper > div.main-menu > ul.level0 > li | 0.002 |
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.eso.org/public/archives/djp/css/main.01d86ad5297f.css | 77.4 KiB | 70.4 KiB |
| www.eso.org/public/archives/djp/css/extras.d3e54451ebbb.css | 13.5 KiB | 13.2 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.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
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
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.eso.org/public/archives/djp/js/main.bf52206884ae.js | 194.6 KiB | 145.3 KiB |
| www.eso.org/mtmo/matomo.js | 65.9 KiB | 38.5 KiB |
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.eso.org/public/archives/djp/css/main.01d86ad5297f.css | 77.7 KiB | 12.8 KiB |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
Andreas Kaufer at Paranal div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2517a.jpg |
The PoET main telescope div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2605a.jpg |
VLT images of two planets forming around the young star WISPIT 2 div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2604a.jpg |
Largest ALMA image ever shows the molecular gas in the centre of the Milky Way div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2603a.jpg |
Cerro Paranal and the Milky Way above it div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/_DSC7159-CC.jpg |
VLT image of a dead star creating a shock wave as it moves through space div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2601a.jpg |
CTAO-South time-capsule monument unveiling div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2521a.jpg |
Artist’s impression of the initial shape of a supernova explosion div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2520a.jpg |
Four lasers for the VLTI div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2519a.jpg |
The RCW 94/95 nebulae in visible and infrared light div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2518a.jpg |
Andreas Kaufer at Paranal div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2517a.jpg |
The PoET main telescope div.slick-track > div.slide > a > img | cdn.eso.org/images/banner1920/eso2605a.jpg |
Inside the world's largest telescope: it's progressing fast! div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/videos/small169/cs0027a.jpg |
El Presidente de la República Checa y el Ministro de Relaciones Exteriores de C… div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/annlang26005a-es-cl.jpg |
Aiming at a cosmic tarantula div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/potw2616a.jpg |
Taxi, please! div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/potw2615a.jpg |
Tour nocturno en Observatorio Paranal div.story-container > a > div.story-img-container > img.story-img | cdn.eso.org/images/small169/annlang26004a-es-cl.jpg |
The World’s Biggest Eye on the Sky div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/elt.jpg |
In search of our Cosmic Origins div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/alma.jpg |
The world’s most advanced visible-light astronomical observatory div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/vlt.jpg |
ESO’s first observatory div.slogan > a > div.img-wrapper > img.img-responsive | www.eso.org/public/archives/static/frontpage/lasilla.jpg |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img | cdn.eso.org/images/thumb350x/2018_04_17_es_moon-venus_4-cc.jpg |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img | cdn.eso.org/images/thumb350x/eso50_obs_compo.jpg |
More information about the performance of your application. These numbers don't directly affect the Performance score.
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.
Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
ESO2517 — PRESS RELEASE
Andreas Kaufer appointed as next ESO Director General
T… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2604 — PRESS RELEASE
A Solar System in the making? Two planets spotted formi… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2603 — PRESS RELEASE
Largest image of its kind shows hidden chemistry at the… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2602 — PRESS RELEASE
AES Andes announces cancellation of INNA, the industria… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2601 — PRESS RELEASE
Astronomers surprised by mysterious shock wave around d… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2521 — PRESS RELEASE
Construction begins on the first and largest gamma-ray … div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2520 — PRESS RELEASE
Unique shape of star’s explosion revealed just a day af… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2519 — PRESS RELEASE
Laser trial run kickstarts new era of interferometry
La… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2518 — PRESS RELEASE
New image captures spooky bat signal in the sky
A spook… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2517 — PRESS RELEASE
Andreas Kaufer appointed as next ESO Director General
T… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
ESO2605 — PRESS RELEASE
First light for PoET: shining (sun)light on exoplanet r… div#pr-carousel > div.slick-list > div.slick-track > div.slide |
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
nav.navbar-general-wrapper > div.navbar-general > div.searchbox > button#searchbox-button nav.navbar-general-wrapper > div.navbar-general > div.searchbox > button#searchbox-button |
div.form-group > div.input-group > span.input-group-btn > button.btn div.form-group > div.input-group > span.input-group-btn > button.btn |
div#content > div#pr-carousel-wrapper > div#pr-carousel > button.slide-prev div#content > div#pr-carousel-wrapper > div#pr-carousel > button.slide-prev |
div#content > div#pr-carousel-wrapper > div#pr-carousel > button.slide-next div#content > div#pr-carousel-wrapper > div#pr-carousel > button.slide-next |
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img |
Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
body > div#content > div#eso-side-logo > a body > div#content > div#eso-side-logo > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div.visitus-container > div.social-links-container > div.social-icons-container > a div.visitus-container > div.social-links-container > div.social-icons-container > a |
div#content > div.privacy-settings > ul.ul-privacy > a div#content > div.privacy-settings > ul.ul-privacy > a |
div.privacy-settings > ul.ul-privacy > li > a div.privacy-settings > ul.ul-privacy > li > 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.
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Press Releases div#body > div.title-categories > div.story-categories > span.story-category |
Announcements div#body > div.title-categories > div.story-categories > span.story-category |
Pictures of the Week div#body > div.title-categories > div.story-categories > span.story-category |
Blog Posts div#body > div.title-categories > div.story-categories > span.story-category |
Videos div#body > div.title-categories > div.story-categories > span.story-category |
13 Mar 2026 — cs0027a div.story-container > a > div.story-description > div.date |
20 Apr 2026 — annlang26005-es-cl-en div.story-container > a > div.story-description > div.date |
20 Apr 2026 — potw2616 div.story-container > a > div.story-description > div.date |
13 Apr 2026 — potw2615 div.story-container > a > div.story-description > div.date |
10 Apr 2026 — annlang26004-es-cl-en div.story-container > a > div.story-description > div.date |
More... div.stories-container > div.story-container > div.story-more-container > span.story-more |
Send us your comments! div#content > div.footernote > div > a |
Subscribe to receive news from ESO in your language div#content > div.footernote > div > a |
Accelerated by CDN77 div#content > div.footernote > div > a |
Terms & Conditions div#content > div.footernote > div > a |
Cookie Settings and Policy div#content > div.footernote > div > span.footer-privacy-settings-link |
OFF div.cookies-table-row-choice > div.cookies-table-cell > div.privacy-setting-toggle > span.privacy-option |
OFF div.cookies-table-row-choice > div.cookies-table-cell > div.privacy-setting-toggle > span.privacy-option |
OFF div#content > div.privacy-settings > div.privacy-setting-toggle > span.privacy-option |
These are opportunities to improve the legibility of your content.
Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Brave
Chrome
Edge
Firefox
Safari body > div#content > div.privacy-settings > ul.ul-privacy |
These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Brave div.privacy-settings > ul.ul-privacy > li > a |
Chrome div.privacy-settings > ul.ul-privacy > li > a |
Edge div.privacy-settings > ul.ul-privacy > li > a |
Firefox div.privacy-settings > ul.ul-privacy > li > a |
Safari div.privacy-settings > ul.ul-privacy > li > a |
One main landmark helps screen reader users navigate a web page. Learn more about landmarks.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
html html |
These items highlight common accessibility best practices.
Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.
Performance issues directly impact user engagement and conversion rates.
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.
Descriptive link text helps search engines understand your content. Learn how to make links more accessible.
Performance issues directly impact user engagement and conversion rates.
| Link destination | Link Text |
|---|---|
| www.eso.org/public/shopinfo/ | Information |
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img |
div.visituss-container > a > div.visitus-container > img div.visituss-container > a > div.visitus-container > img |
Format your HTML in a way that enables crawlers to better understand your app’s content.
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