Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

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GRADE

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Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
www.esa.int/fontawesome/css/fontawesome.css	3600.0 s	37.3 KiB
/var/esa/cache/public/javascript/ec3756e8a47adc0f64e3c434...	3600.0 s	35.5 KiB
www-analytics.esa.int/matomo.js	3600.0 s	20.8 KiB
/var/esa/cache/public/stylesheets/c35b41a32fb01cc5cc5a0ef...	3600.0 s	14.8 KiB
www.esa.int/fontawesome/css/brands.css	3600.0 s	4.9 KiB
www.esa.int/fontawesome/css/solid.css	3600.0 s	463 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
www.esa.int/fontawesome/webfonts/fa-solid-900.woff2	180 ms
www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/NotesESAbold.woff	50 ms
/extension/pillars/design/pillars/stylesheets/fonts/Notes...	50 ms
www.esa.int/fontawesome/webfonts/fa-brands-400.woff2	50 ms
www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/NotesStyle.woff	45 ms
/extension/pillars/design/pillars/stylesheets/fonts/flexs...	45 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

items: [map[reflowTime:79.436 source:map[column:29811 line:2 type:source-location url:https://code.jquery.com/jquery-2.2.4.min.js urlProvider:network]]]

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

items: [map[reflowTime:9.376 source:map[column:18201 line:2 type:source-location url:https://code.jquery.com/jquery-2.2.4.min.js urlProvider:network]] map[reflowTime:56.767 source:map[column:19379 line:2 type:source-location url:https://code.jquery.com/jquery-2.2.4.min.js urlProvider:network]] map[reflowTime:1.676 source:map[column:19393 line:2 type:source-location url:https://code.jquery.com/jquery-2.2.4.min.js urlProvider:network]] map[reflowTime:0.356 source:map[column:21327 line:2 type:source-location url:https://code.jquery.com/jquery-2.2.4.min.js urlProvider:network]] map[reflowTime:7.425 source:map[column:2961 line:1 type:source-location url:https://www.esa.int/var/esa/cache/public/javascript/ec3756e8a47adc0f64e3c43418bca85a_1729093166.js urlProvider:network]] map[reflowTime:13.41 source:map[column:3136 line:1 type:source-location url:https://www.esa.int/var/esa/cache/public/javascript/ec3756e8a47adc0f64e3c43418bca85a_1729093166.js urlProvider:network]] map[reflowTime:37.436 source:map[column:3174 line:1 type:source-location url:https://www.esa.int/var/esa/cache/public/javascript/ec3756e8a47adc0f64e3c43418bca85a_1729093166.js urlProvider:network]] map[reflowTime:0.436 source:map[column:20687 line:3 type:source-location url:https://code.jquery.com/jquery-2.2.4.min.js urlProvider:network]]]

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
FLEX, Sentinel-3C and MTG-I2 on show at TAS cleanrooms `li.flex-active-slide > div.feature-item > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2026/04/mtg...	972.3 KiB	699.7 KiB
Trifid Nebula (Wide Field Camera 3 Image) `li > div.feature-item > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2026/04/tri...	558.5 KiB	271.5 KiB
li > div.feature-item > figure.thumbnail > img.image-bg `li > div.feature-item > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2026/04/a_f...	349.9 KiB	152.8 KiB
HydRON optical communication for broadband in space `div.grid-item > a.card > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2021/07/hyd...	118.4 KiB	106.2 KiB
This Copernicus Sentinel-2 image captures an active lava flow on the Piton de l… `div.grid-item > a.card > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2026/04/ear...	119.9 KiB	91.2 KiB
Mars Express captures dark ash covering Mars’s Utopia Planitia `div.grid-item > a.card > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2026/04/mar...	88.3 KiB	76.1 KiB
εpsilon website `div.grid-item > a.card > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2026/01/eps...	97.2 KiB	72.8 KiB
div.grid-item > a.card > figure.thumbnail > img.image-bg `div.grid-item > a.card > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/videos/2026/04/art...	77.8 KiB	65.6 KiB
This image from the Copernicus Sentinel-2 mission captures the coast of Gabon i… `div.grid-item > a.card > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2026/04/ear...	65.2 KiB	44.5 KiB
Strong gravitational lenses captured by Euclid `div.grid-item > a.card > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2025/03/str...	34.5 KiB	22.3 KiB
section.feature > div.feature-item > figure.thumbnail > img.image-bg `section.feature > div.feature-item > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/videos/2024/07/ari...	172.7 KiB	10.7 KiB
Salps `div.grid-item > a.card > figure.thumbnail > img.image-bg`	/var/esa/storage/images/esa_multimedia/images/2026/04/sal...	16.6 KiB	4.4 KiB

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
code.jquery.com/jquery-2.2.4.min.js	29.5 KiB	243 ms
/var/esa/cache/public/javascript/ec3756e8a47adc0f64e3c434...	35.5 KiB
www.esa.int/fontawesome/css/fontawesome.css	37.3 KiB	80 ms
www.esa.int/fontawesome/css/solid.css	463 B
www.esa.int/fontawesome/css/brands.css	4.9 KiB
/var/esa/cache/public/stylesheets/c35b41a32fb01cc5cc5a0ef...	14.8 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: 811 ms

URL	Time Spent
esa.int/	811 ms
www.esa.int/	0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 40 ms 47.5 KiB

URL	Transfer Size	Est Savings
www.esa.int/fontawesome/css/fontawesome.css	37.1 KiB	37.0 KiB
/var/esa/cache/public/stylesheets/c35b41a32fb01cc5cc5a0ef...	14.7 KiB	10.5 KiB

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 6.0 KiB

URL	Transfer Size	Est Savings
www.esa.int/fontawesome/css/fontawesome.css	37.3 KiB	6.0 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/var/esa/storage/images/esa_multimedia/images/2022/02/esa...	5.1 MiB
/var/esa/storage/images/esa_multimedia/images/2023/01/her...	1.9 MiB
/var/esa/storage/images/esa_multimedia/images/2026/04/mtg...	973.0 KiB
/var/esa/storage/images/esa_multimedia/images/2026/04/the...	657.0 KiB
/var/esa/storage/images/esa_multimedia/images/2026/04/tri...	559.0 KiB
/var/esa/storage/images/esa_multimedia/images/2023/11/euc...	535.2 KiB
/var/esa/storage/images/esa_multimedia/images/2026/04/a_f...	350.3 KiB
www.esa.int/fontawesome/webfonts/fa-solid-900.woff2	320.5 KiB
/var/esa/storage/images/esa_multimedia/images/2026/03/her...	278.1 KiB
/var/esa/storage/images/esa_multimedia/videos/2026/04/art...	213.5 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
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open item `figure.thumbnail > header.entry > a.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open item `figure.thumbnail > header.entry > a.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open item `figure.thumbnail > header.entry > a.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open item `figure.thumbnail > header.entry > a.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open item `figure.thumbnail > header.entry > a.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open item `figure.thumbnail > header.entry > a.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Read `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Open `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow.svg
Germany `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_ger.png
Austria `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_aus.png
Belgium `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_bel.png
Denmark `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_den.png
Spain `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_spa.png
Estonia `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_est.png
Finland `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_fin.png
France `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_fra.png
Greece `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_gre.png
Hungary `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_hun.png
Ireland `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_ire.png
Italy `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_ita.png
Luxembourg `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_lux.png
Norway `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_nor.png
The Netherlands `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_the.png
Poland `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_pol.png
Portugal `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_por.png
Czechia `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_cze.png
Romania `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_rom.png
United Kingdom `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_uni.png
Slovenia `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_slo.png
Sweden `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_swe.png
Switzerland `div.theme-block > div.section-group > a.btn > img`	www.esa.int/extension/pillars/design/pillars/images/flags/flag_swi.png
ESA search toggle `section#esa-header > div.esa-header__left > button#esa-search > img.esa-header__icon`	www.esa.int/extension/pillars/design/pillars/images/ESA_Search.svg
ESA menu toggle `section#esa-header > div.esa-header__left > button#esa-menu > img.esa-header__icon`	www.esa.int/extension/pillars/design/pillars/images/ESA_Menu.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Open `a.card > figure.thumbnail > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
Play `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg
View `div.grid-item > a.card > div.cta > img.arrow`	www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg

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

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 60 ms

●Minify JavaScript

●Reduce unused JavaScript

●JavaScript execution time 0.1 s

●Minimizes main-thread work 0.7 s

●Avoid long main-thread tasks 1 long task found

●Avoid non-composited animations 2 animated elements found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 220 ms

●Server Backend Latencies 60 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 0 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid large layout shifts

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
AGENCY `a.card > figure.thumbnail > header.entry > span.pillar`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
21/04/2026 `a.card > header.entry > div.meta > span`
1426 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
25 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
APPLICATIONS `div.grid-item > a.card > header.entry > span.pillar`
15/04/2026 `a.card > header.entry > div.meta > span`
1822 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
58 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
15/04/2026 `a.card > header.entry > div.meta > span`
7008 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
70 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
APPLICATIONS `div.grid-item > a.card > header.entry > span.pillar`
15/04/2026 `a.card > header.entry > div.meta > span`
1573 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
47 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
13/04/2026 `a.card > header.entry > div.meta > span`
10039 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
119 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
Discover our week through the lens `div.grid-item > a.card > header.entry > p.subheading`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
MORE ITEMS `div.grid-item > a.card > div.outline > h3.heading`
ENABLING & SUPPORT `div.feature-item > figure.thumbnail > header.entry > span.pillar`
Discover our missions: past, present and future. `div.grid-item > a.card > header.entry > p.subheading`
Explore the full range of ESA’s activities through a set of thematic journeys `div.grid-item > a.card > header.entry > p.subheading`
This is ESA is an illustrated guide to what ESA is and what we do. Now availabl… `div.grid-item > a.card > header.entry > p.subheading`
Check out all our active blogs - although update frequency can vary. `div.grid-item > a.card > header.entry > p.subheading`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
20/04/2026 `a.card > header.entry > div.meta > span`
2852 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
24 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
281882 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
397 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
21/04/2026 `a.card > header.entry > div.meta > span`
1426 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
25 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
31621005 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
63730 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
AGENCY `div.grid-item > a.card > header.entry > span.pillar`
396879 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
701 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
AGENCY `div.grid-item > a.card > header.entry > span.pillar`
1513652 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
1843 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
13/04/2026 `a.card > header.entry > div.meta > span`
10039 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
119 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
02/04/2026 `a.card > header.entry > div.meta > span`
12751 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
143 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
APPLICATIONS `div.grid-item > a.card > header.entry > span.pillar`
28/03/2026 `a.card > header.entry > div.meta > span`
2834 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
75 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
27/03/2026 `a.card > header.entry > div.meta > span`
114642 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
977 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
SCIENCE & EXPLORATION `div.grid-item > a.card > header.entry > span.pillar`
26/03/2026 `a.card > header.entry > div.meta > span`
1351 VIEWS `a.card > header.entry > div.meta > span`
VIEWS `header.entry > div.meta > span > small`
21 LIKES `a.card > header.entry > div.meta > span`
LIKES `header.entry > div.meta > span > small`
MORE ITEMS `div.grid-item > a.card > div.outline > h3.heading`
Work with a highly dedicated team, committed to ensuring that Europe continues … `div.grid-item > a.card > header.entry > p.subheading`
ESA procurements aim to accomplish ESA space missions and to support the compet… `div.grid-item > a.card > header.entry > p.subheading`
Submit your ideas and change the future of space research, technology and appli… `div.grid-item > a.card > header.entry > p.subheading`
Creating links between new businesses and ESA `div.grid-item > a.card > header.entry > p.subheading`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
SCIENCE & EXPLORATION `a.card > figure.thumbnail > header.entry > span.pillar`
SCIENCE & EXPLORATION `a.card > figure.thumbnail > header.entry > span.pillar`
APPLICATIONS `a.card > figure.thumbnail > header.entry > span.pillar`
MORE ITEMS `div.grid-item > a.card > div.outline > h3.heading`

These are opportunities to improve the legibility of your content.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > a`
div.wrapper > section#footer > div.social-media-links > a `div.wrapper > section#footer > div.social-media-links > 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.

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
1 `div.flexslider > ol.flex-control-nav > li > a.flex-active`
2 `div.flexslider > ol.flex-control-nav > li > a`
3 `div.flexslider > ol.flex-control-nav > li > a`
4 `div.flexslider > ol.flex-control-nav > li > a`

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

●Document has a `<title>` element

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

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

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

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

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Identical links have the same purpose.

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements 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

○Form elements have associated labels

○Links are distinguishable without relying on color.

○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.

○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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

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`