https://cas.cz
Lighthouse Desktop
· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.SCORE
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Detailed Report
Audit breakdown by category with detailed findings.
61
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.
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 |
|---|---|
| /font-awesome/4.6.3/fonts/fontawesome-webfont.woff2?v=4.6.3 | 25 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:46.097 source:map[column:4688 line:3 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.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:19.675 source:map[column:24594 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:105.036 source:map[column:30738 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.441 source:map[column:27566 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.076 source:map[column:27658 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:6.027 source:map[column:24616 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.134 source:map[column:387 line:0 type:source-location url:https://osw-analytics3.avcr.cz/js/plausible.manual.file-downloads.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 | |
|---|---|---|---|
div.slide-item > a > div.img-wrapper > img.img-fluid div.slide-item > a > div.img-wrapper > img.img-fluid | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 158.9 KiB | 91.7 KiB |
Na hradě Štamberk se zřejmě bydlelo pouhých 150 let. div.content > div.thumbs > div.bigThumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 73.7 KiB | 60.5 KiB |
Hlavní dominantu Vyšehradu dnes tvoří kapitulní chrám sv. apoštolů Petra a Pavl… div.content > div.thumbs > div.bigThumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 53.5 KiB | 40.3 KiB |
Na okraji Kroměříže se nacházejí dva Medkovy rybníky. Invazní sumeček černý se … div.content > div.thumbs > div.bigThumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 50.8 KiB | 37.6 KiB |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 47.2 KiB | 34.2 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 42.1 KiB | 33.6 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 35.8 KiB | 30.6 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim... | 37.6 KiB | 29.2 KiB |
Akademie věd České republiky div.footer > div.logo > a > img | /export/system/modules/cz.nelasoft.opencms.avcr/resources... | 29.5 KiB | 28.2 KiB |
Centrum translačního výzkumu PharmTheon se nachází na pražské Harfě. Disponuje … div.content > div.thumbs > div.bigThumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 40.7 KiB | 27.5 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 35.7 KiB | 27.2 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 35.1 KiB | 26.7 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 28.4 KiB | 24.1 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 29.9 KiB | 21.5 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 25.3 KiB | 21.4 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 25.2 KiB | 21.4 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 24.4 KiB | 20.7 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 28.3 KiB | 20.3 KiB |
Letiště Roudnice nad Labem. Odsud startovaly lety pro veřejnost v rámci Archeol… div.content > div.thumbs > div.bigThumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 33.2 KiB | 20.0 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 23.5 KiB | 19.9 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 22.6 KiB | 19.1 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 26.1 KiB | 18.8 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 20.7 KiB | 17.6 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 20.5 KiB | 17.4 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 20.5 KiB | 17.4 KiB |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 29.8 KiB | 16.8 KiB |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 28.8 KiB | 16.2 KiB |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 20.0 KiB | 14.4 KiB |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 23.8 KiB | 13.4 KiB |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 19.1 KiB | 10.7 KiB |
Sumeček černý pochází původně ze Severní Ameriky, do Evropy se dostal v 19. sto… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 8.1 KiB | 6.7 KiB |
Z hradu se zachoval kus vysoké jižní zdi, částečně odhalené stěny dvouprostorov… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 7.8 KiB | 6.5 KiB |
V roce 2003 povýšil papež Jan Pavel II. vyšehradský kapitulní chrám na papežsko… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 7.8 KiB | 6.5 KiB |
Zřícenina se nachází u Telče, která je nejen kulturní památkou zapsanou na Sezn… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 7.7 KiB | 6.4 KiB |
Čas jeho slávy se dá ohraničit poslední čtvrtinou 13. století a husitskými válk… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 7.3 KiB | 6.0 KiB |
Kromě letadla s pilotem potřebuje „nebeský“ archeolog i další vybavení. Dříve, … div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 7.0 KiB | 5.7 KiB |
Pro vodní ekosystémy představuje tato rybka velkou hrozbu. Je všežravá, nemá mn… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 7.0 KiB | 5.6 KiB |
„Chovatelé mají s tímto druhem velký problém. Finanční ztráty se dají vyčíslit … div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 6.7 KiB | 5.4 KiB |
V současné době výzkumníci rozvíjejí několik projektů, které se zaměřují předev… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 6.6 KiB | 5.2 KiB |
V kapli sv. Klimenta uvnitř chrámu se nachází románský sarkofág (v pravém dolní… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 6.5 KiB | 5.2 KiB |
Pod presbytářem kapitulního chrámu je dobře zachovaná románská apsida (půlkruho… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 6.4 KiB | 5.1 KiB |
Návštěvníci měli možnost zúčastnit se letu s nestorem české letecké archeologie… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 6.1 KiB | 4.8 KiB |
Při přenosu léků z laboratoře do klinické praxe je klíčová rychlost a preciznos… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 6.0 KiB | 4.7 KiB |
Pomocí NMR spektroskopie vědci v PharmTheonu zkoumají, jak přesně vypadají a fu… div.content > div.thumbs > div.thumb > img | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... | 5.7 KiB | 4.4 KiB |
Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.
Why this matters
Performance issues directly impact user engagement and conversion rates.
headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:2374.843 label:Time to first byte subpart:timeToFirstByte] map[duration:154.982 label:Resource load delay subpart:resourceLoadDelay] map[duration:1400.465 label:Resource load duration subpart:resourceLoadDuration] map[duration:53.211 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-IMG
nodeLabel: div.slide-item > a > div.img-wrapper > img.img-fluid
path: 1,HTML,1,BODY,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,A,0,DIV,0,IMG
selector: div.slide-item > a > div.img-wrapper > img.img-fluid
snippet: <img src="/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/2026/2026_04_21_L…" alt="" class="img-fluid">
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Why this matters
Performance issues directly impact user engagement and conversion rates.
lhId: page-0-IMG
nodeLabel: div.slide-item > a > div.img-wrapper > img.img-fluid
path: 1,HTML,1,BODY,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,A,0,DIV,0,IMG
selector: div.slide-item > a > div.img-wrapper > img.img-fluid
snippet: <img src="/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/2026/2026_04_21_L…" alt="" class="img-fluid">
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
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.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
Why this matters
Performance issues directly impact user engagement and conversion rates.
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: 1.3 s
| URL | Time Spent |
|---|---|
| cas.cz/ | 680 ms |
| www.avcr.cz/ | 665 ms |
| www.avcr.cz/cs/ | 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
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: 190 ms 33.5 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /export/system/modules/cz.nelasoft.opencms.avcr/resources... | 71.4 KiB | 21.5 KiB |
| /export/system/modules/cz.nelasoft.opencms.avcr/resources... | 33.5 KiB | 5.1 KiB |
| /export/system/modules/cz.nelasoft.opencms.media/resource... | 24.4 KiB | 4.4 KiB |
| /export/system/modules/cz.nelasoft.opencms.avcr/resources... | 15.8 KiB | 2.6 KiB |
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 190 ms 118.6 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /export/system/modules/cz.nelasoft.opencms.avcr/resources... | 71.1 KiB | 59.9 KiB |
| /export/system/modules/cz.nelasoft.opencms.media/resource... | 24.1 KiB | 24.1 KiB |
| /export/system/modules/cz.nelasoft.opencms.avcr/resources... | 33.2 KiB | 19.1 KiB |
| /export/system/modules/cz.nelasoft.opencms.avcr/resources... | 15.5 KiB | 15.5 KiB |
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 190 ms 257.9 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.googletagmanager.com/gtag/js?id=G-ETQEE59TKV | 156.8 KiB | 85.7 KiB |
| /export/system/modules/cz.nelasoft.opencms.media/resource... | 79.3 KiB | 65.3 KiB |
| /system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu... | 74.0 KiB | 65.1 KiB |
| /system/modules/cz.nelasoft.opencms.avcr/resources/js/owl... | 23.3 KiB | 21.6 KiB |
| /system/modules/cz.osw.opencms.types/resources/slick-phot... | 51.9 KiB | 20.2 KiB |
Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 0.0 ms 11.1 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /system/modules/cz.nelasoft.opencms.avcr/resources/js/coo... | 20.5 KiB | 11.1 KiB |
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Why this matters
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
div.slide-item > a > div.img-wrapper > img.img-fluid div.slide-item > a > div.img-wrapper > img.img-fluid | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive | /export/sites/avcr.cz/.content/galerie-obrazku/aktuality/... |
More information about the performance of your application. These numbers don't directly affect the Performance score.
●Layout shift culprits
●Optimize DOM size
●Optimize viewport for mobile
●Max Potential First Input Delay 40 ms
●Avoids enormous network payloads Total size was 2,264 KiB
●JavaScript execution time 0.2 s
●Minimizes main-thread work 0.8 s
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 160 ms
●Server Backend Latencies 30 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 420 ms
●Avoid large layout shifts 2 layout shifts found
○INP breakdown
○User Timing marks and measures
○Avoid long main-thread tasks
○Avoid non-composited animations
93
Accessibility
These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.
Names and labels
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#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a |
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a |
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a |
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a |
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a |
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a |
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a |
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a |
div.video-entry > div.video-entry-inner > div.image > a div.video-entry > div.video-entry-inner > div.image > a |
div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep |
div.video-entry > div.video-entry-inner > div.image > a div.video-entry > div.video-entry-inner > div.image > a |
div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep |
div.video-entry > div.video-entry-inner > div.image > a div.video-entry > div.video-entry-inner > div.image > a |
div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep |
div > div.col-xs-12 > div.image > a div > div.col-xs-12 > div.image > a |
div.content > div.title > h3 > a div.content > div.title > h3 > a |
div > div.col-xs-12 > div.image > a div > div.col-xs-12 > div.image > a |
div.content > div.title > h3 > a div.content > div.title > h3 > a |
div > div.col-xs-12 > div.image > a div > div.col-xs-12 > div.image > a |
div.content > div.title > h3 > a div.content > div.title > h3 > a |
div > div.col-xs-12 > div.image > a div > div.col-xs-12 > div.image > a |
div.content > div.title > h3 > a div.content > div.title > h3 > a |
div > div.col-xs-12 > div.image > a div > div.col-xs-12 > div.image > a |
div.content > div.title > h3 > a div.content > div.title > h3 > 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
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 |
|---|
zpracování osobních údajů form#nwl_form > div.sk_col2 > div > a |
Poslání div.footer-nav-col > ul > li > a |
Struktura div.footer-nav-col > ul > li > a |
Ocenění div.footer-nav-col > ul > li > a |
Historie div.footer-nav-col > ul > li > a |
Výroční zpráva div.footer-nav-col > ul > li > a |
Hodnocení div.footer-nav-col > ul > li > a |
Kariéra div.footer-nav-col > ul > li > a |
Kontakt div.footer-nav-col > ul > li > a |
Podpora výzkumu div.footer-nav-col > ul > li > a |
Vědecký titul DSc. div.footer-nav-col > ul > li > a |
Pomoc Ukrajině div.footer-nav-col > ul > li > a |
Spolupráce div.footer-nav-col > ul > li > a |
Transfer technologií div.footer-nav-col > ul > li > a |
Mezinárodní vztahy div.footer-nav-col > ul > li > a |
Vědecké společnosti div.footer-nav-col > ul > li > a |
Znalecká činnost div.footer-nav-col > ul > li > a |
Výstavy div.footer-nav-col > ul > li > a |
Časopisy div.footer-nav-col > ul > li > a |
Podcasty div.footer-nav-col > ul > li > a |
Videotvorba div.footer-nav-col > ul > li > a |
NEZkreslená věda div.footer-nav-col > ul > li > a |
Kurzy pro pedagogy div.footer-nav-col > ul > li > a |
Stáže pro studenty div.footer-nav-col > ul > li > a |
Občanská věda div.footer-nav-col > ul > li > a |
Publikace ke stažení div.footer-nav-col > ul > li > a |
Kontakty pro média div.footer-nav-col > ul > li > a |
Časopis Živa div.footer-nav-col > ul > li > a |
Knihovna AV ČR div.footer-nav-col > ul > li > a |
Nakladatelství Academia div.footer-nav-col > ul > li > a |
Týden Akademie věd ČR div.footer-nav-col > ul > 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-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●All heading elements contain content.
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○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>`.
○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`