https://coub.com
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.
74
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.
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:82.161 source:map[column:47 line:60515 type:source-location url:https://assets-cdn-s.coub.com/assets/site-b14280a713262d06a8741f014999b8b61b69af8d3b862f54e167430734e77a28.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:73.024 source:map[column:14 line:6698 type:source-location url:https://assets-cdn-s.coub.com/assets/sync_bundle-bcaff46185690a548a0a5c2ae6bf7869ef4c117525feb11ff66de14d386f731e.js urlProvider:network]] map[reflowTime:0.758 source:map[column:31 line:25251 type:source-location url:https://assets-cdn-s.coub.com/assets/site-b14280a713262d06a8741f014999b8b61b69af8d3b862f54e167430734e77a28.js urlProvider:network]] map[reflowTime:0.477 source:map[column:50 line:9296 type:source-location url:https://assets-cdn-s.coub.com/assets/sync_bundle-bcaff46185690a548a0a5c2ae6bf7869ef4c117525feb11ff66de14d386f731e.js urlProvider:network]] map[reflowTime:4.519 source:map[column:44 line:9220 type:source-location url:https://assets-cdn-s.coub.com/assets/sync_bundle-bcaff46185690a548a0a5c2ae6bf7869ef4c117525feb11ff66de14d386f731e.js urlProvider:network]] map[reflowTime:0.375 source:map[type:text value:[unattributed]]] map[reflowTime:10.541 source:map[column:70 line:14 type:source-location url:https://mc.yandex.ru/metrika/tag.js urlProvider:network]] map[reflowTime:10.471 source:map[column:118 line:41033 type:source-location url:https://assets-cdn-s.coub.com/assets/site-b14280a713262d06a8741f014999b8b61b69af8d3b862f54e167430734e77a28.js urlProvider:network]] map[reflowTime:9.191 source:map[column:20 line:32070 type:source-location url:https://assets-cdn-s.coub.com/assets/site-b14280a713262d06a8741f014999b8b61b69af8d3b862f54e167430734e77a28.js urlProvider:network]] map[reflowTime:0.167 source:map[column:17 line:32071 type:source-location url:https://assets-cdn-s.coub.com/assets/site-b14280a713262d06a8741f014999b8b61b69af8d3b862f54e167430734e77a28.js urlProvider:network]] map[reflowTime:2.908 source:map[column:35 line:6853 type:source-location url:https://assets-cdn-s.coub.com/assets/sync_bundle-bcaff46185690a548a0a5c2ae6bf7869ef4c117525feb11ff66de14d386f731e.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.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img | /coub_storage/coub/simple/cw_timeline_pic/77be9313487/b7b... | 80.0 KiB | 42.5 KiB |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img | /coub_storage/coub/simple/cw_timeline_pic/af5cd35379e/9a7... | 69.4 KiB | 31.9 KiB |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image | /coub_storage/channel/cw_avatar/20c37940079/f351a388e345f... | 31.9 KiB | 30.8 KiB |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image | /coub_storage/channel/cw_avatar/1343fbc4b57/80bdfe6728dde... | 27.4 KiB | 27.3 KiB |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image | /coub_storage/channel/cw_avatar/1a4fb32b2e0/1949905f671be... | 26.7 KiB | 25.7 KiB |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img | /coub_storage/coub/simple/cw_timeline_pic/e128866124e/a9d... | 39.5 KiB | 9.7 KiB |
Gaming nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/49fb773a80c/efee899b14f85... | 9.6 KiB | 9.5 KiB |
Science & Technology nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/d7b917ae565/55b6fc9b6407f... | 9.4 KiB | 9.2 KiB |
Sports nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/f582005153c/999b059f60e79... | 9.1 KiB | 8.9 KiB |
Auto & Technique nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/dcda24f72f3/076e0f1bc1028... | 8.8 KiB | 8.6 KiB |
Mashup nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/93ae83fbc3f/4d90453882a0f... | 8.7 KiB | 8.5 KiB |
Animals & Pets nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/60432c0f1f4/5d35698dc76c5... | 8.6 KiB | 8.4 KiB |
Cartoons nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/f8ede745da4/2e6c3a22d04db... | 8.4 KiB | 8.2 KiB |
Dance nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/d7afb96f274/3e8dad0b674f8... | 8.0 KiB | 7.9 KiB |
Movies & TV nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/dda6b36d2fb/9ae8ba82060e5... | 7.9 KiB | 7.8 KiB |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image | /coub_storage/channel/cw_avatar/e81abddfed3/240b107d47753... | 8.1 KiB | 7.7 KiB |
Anime nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/79d6e4a3e73/c0b7416c30391... | 7.8 KiB | 7.7 KiB |
Art & Design nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/bc49636b5e9/9d819c4215f13... | 7.7 KiB | 7.6 KiB |
Nature & Travel nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/a4b57370b28/3c9d9a8cf4246... | 7.7 KiB | 7.5 KiB |
Stand-up & Jokes nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/e705818f6da/2d68d0903305d... | 7.6 KiB | 7.4 KiB |
Fashion & Beauty nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/503df3602c0/3bb25ae4face4... | 7.2 KiB | 7.0 KiB |
Live Pictures nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/6a781fee541/43bd121143177... | 7.0 KiB | 6.8 KiB |
Blogging nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/cc945f16597/2b4fb4d4deb9e... | 6.7 KiB | 6.5 KiB |
Music nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/0327247c5ff/85914bdd8e1ed... | 6.6 KiB | 6.5 KiB |
Celebrity nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/f29db91ad17/ceeba69e8fe30... | 6.5 KiB | 6.4 KiB |
Memes nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/c9ec52f6b8e/901439d39eb2d... | 6.4 KiB | 6.2 KiB |
Food & Kitchen nav.main-menu__nav > ul > li.main-menu__switcher-item > img | /coub_storage/category/cw_image/496fb34cd0a/573a3d5c899f3... | 5.9 KiB | 5.8 KiB |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img | /coub_storage/coub/simple/cw_timeline_pic/c878b409474/4ce... | 54.1 KiB | 5.2 KiB |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image | /coub_storage/channel/cw_avatar/4432ca3271d/66560d0bda896... | 6.3 KiB | 4.3 KiB |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image | /coub_storage/channel/cw_avatar/3aa6b56f7c5/fb8c358447513... | 4.5 KiB | 4.1 KiB |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image | /coub_storage/channel/cw_avatar/a46dbdfa7da/5582bbacd457a... | 6.0 KiB | 4.0 KiB |
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Why this matters
Performance issues directly impact user engagement and conversion rates.
lhId: page-31-IMG
nodeLabel: div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img
path: 1,HTML,1,BODY,0,DIV,3,DIV,1,DIV,1,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,IMG
selector: div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img
snippet: <img src="https://attachments-cdn-s.coub.com/coub_storage/coub/simple/cw_timeline_pi…" class="viewer__img">
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
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: 316 ms
| URL | Time Spent |
|---|---|
| coub.com/ | 316 ms |
| coub.com/featured/creators | 0.0 ms |
The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.
Why this matters
Performance issues directly impact user engagement and conversion rates.
TTI
Diagnostics
Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 150 ms 228.5 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /assets/site-b14280a713262d06a8741f014999b8b61b69af8d3b86... | 662.2 KiB | 184.0 KiB |
| /assets/sync_bundle-bcaff46185690a548a0a5c2ae6bf7869ef4c1... | 209.6 KiB | 44.5 KiB |
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 0.0 ms 58.5 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /assets/coub/core_light-c062b7ff754032b4ca0e52a6925ed12a6... | 64.1 KiB | 58.5 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: 450 ms 647.7 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /assets/site-b14280a713262d06a8741f014999b8b61b69af8d3b86... | 660.7 KiB | 451.8 KiB |
| www.googletagmanager.com/gtag/js?id=G-57C6383EJ1&cx=c>m=4e64h1 | 160.3 KiB | 64.2 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-MXHWXFG | 120.3 KiB | 61.7 KiB |
| mc.yandex.ru/metrika/tag.js | 84.7 KiB | 45.4 KiB |
| /assets/sync_bundle-bcaff46185690a548a0a5c2ae6bf7869ef4c1... | 202.4 KiB | 24.7 KiB |
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| URL | Total CPU Time | Script Evaluation | Script Parse |
|---|---|---|---|
| /assets/site-b14280a713262d06a8741f014999b8b61b69af8d3b86... | 743 ms | 396 ms | 148 ms |
| /assets/sync_bundle-bcaff46185690a548a0a5c2ae6bf7869ef4c1... | 396 ms | 250 ms | 47 ms |
| Unattributable | 300 ms | 20 ms | 0.0 ms |
| mc.yandex.ru/metrika/tag.js | 298 ms | 255 ms | 12 ms |
| www.googletagmanager.com/gtag/js?id=G-57C6383EJ1&cx=c>m=4e64h1 | 190 ms | 142 ms | 19 ms |
| coub.com/featured/creators | 176 ms | 4.5 ms | 2.1 ms |
| www.googletagmanager.com/gtm.js?id=GTM-MXHWXFG | 64 ms | 49 ms | 14 ms |
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Category | Time Spent |
|---|---|
| Script Evaluation | 1.1 s |
| Other | 413 ms |
| Script Parsing & Compilation | 242 ms |
| Style & Layout | 213 ms |
| Parse HTML & CSS | 80 ms |
| Garbage Collection | 62 ms |
| Rendering | 51 ms |
Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failure reason | Failure type |
|---|---|
| The page has an unload handler in the main frame. | Actionable |
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.
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
●Render blocking requests
●Optimize viewport for mobile
●Minify CSS
●User Timing marks and measures 25 user timings
●Avoid long main-thread tasks 7 long tasks found
●Image elements have explicit `width` and `height`
●Network Requests
●Network Round Trip Times 50 ms
●Server Backend Latencies 50 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 140 ms
○INP breakdown
○Avoid non-composited animations
○Avoid large layout shifts
43
Accessibility
These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.
Names and labels
When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb div.coub-description__about__inner > div.dropdown > div.dropdown__handler > button.sb |
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__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.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill nav.main-menu__nav > ul > li.main-menu__switcher-item > a.-fill |
ul > div.main-menu__social-block > div.main-menu__social-buttons > a.main-menu__social-button ul > div.main-menu__social-block > div.main-menu__social-buttons > a.main-menu__social-button |
ul > div.main-menu__social-block > div.main-menu__social-buttons > a.main-menu__social-button ul > div.main-menu__social-block > div.main-menu__social-buttons > a.main-menu__social-button |
ul > div.main-menu__social-block > div.main-menu__social-buttons > a.main-menu__social-button ul > div.main-menu__social-block > div.main-menu__social-buttons > a.main-menu__social-button |
div.header__contents > div.header__left > div.header__logo > a div.header__contents > div.header__left > div.header__logo > a |
div.page-menu > div.page-menu__inner > div.page-menu__item > a.-fill div.page-menu > div.page-menu__inner > div.page-menu__item > a.-fill |
div.page-menu > div.page-menu__inner > div.page-menu__item > a.-fill div.page-menu > div.page-menu__inner > div.page-menu__item > a.-fill |
div.page-menu > div.page-menu__inner > div.page-menu__item > a.-fill div.page-menu > div.page-menu__inner > div.page-menu__item > a.-fill |
div.list__item > div.channel > div.object-media__img > a.-ribbon div.list__item > div.channel > div.object-media__img > a.-ribbon |
div.list__item > div.channel > div.object-media__img > a.-ribbon div.list__item > div.channel > div.object-media__img > a.-ribbon |
div.list__item > div.channel > div.object-media__img > a.-ribbon div.list__item > div.channel > div.object-media__img > a.-ribbon |
div.list__item > div.channel > div.object-media__img > a.-ribbon div.list__item > div.channel > div.object-media__img > a.-ribbon |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a div.coub-description__about > div.coub-description__about__inner > div.coub-description__avatar > a |
div.coub-description__buttons > div.description__controls > div.coub__comments-button > a div.coub-description__buttons > div.description__controls > div.coub__comments-button > a |
div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration div.coub-description__buttons > div.description__controls > div.coub__remix-button > a.toggle-registration |
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Contrast
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
It's an obsession, basically div.list__item > div.channel > div.object-media__body > p.channel__stamp |
Peculiar and pretty objects div.list__item > div.channel > div.object-media__body > p.channel__stamp |
Moments worth keeping, from the brand new to the classic. div.list__item > div.channel > div.object-media__body > p.channel__stamp |
Ten seconds can equal eternity. #PerfectLoop div.list__item > div.channel > div.object-media__body > p.channel__stamp |
96 div.coub-description__views-count > div.counter > div.dropdown__handler > div |
#
14 div.coub-description__badges > div.dropdown > div.dropdown__handler > button.sb |
These are opportunities to improve the legibility of your content.
Navigation
Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Thematic channels div > div.channels-block > div.channels-block__heading > h3 |
True celebrities div.list__item > div.channel > div.object-media__body > h5.channel__title |
These are opportunities to improve keyboard navigation in your application.
Internationalization and localization
If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
html.webkit html.webkit |
These are opportunities to improve the interpretation of your content by users in different locales.
Tables and lists
Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Home
Popular
Featured
Best coubs
Stories
Who to follow
My likes
Bookmarks
Commu… div.main-menu__wrapper > div.antiscroll-inner > nav.main-menu__nav > ul |
These are opportunities to improve the experience of reading tabular or list data using 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 |
One main landmark helps screen reader users navigate a web page. Learn more about landmarks.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
html.webkit html.webkit |
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>`
●Form elements have associated labels
●Document has a `<title>` element
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
●Image elements do not have `[alt]` attributes that are redundant text.
○`[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 a valid value for its `[lang]` attribute
○`<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
○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.
○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
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Identical links have the same purpose.
○Elements with visible text labels have matching accessible names.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
77
Best Practices
General
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| Unload event listeners are deprecated and will be removed. | /assets/sync_bundle-bcaff46185690a548a0a5c2ae6bf7869ef4c1... line 3005, col 11 |
Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Source | Description |
|---|---|
NotAllowedError: play() failed because the user didn't interact with the document first. https://goo.gl/xX8pDD |
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.
Why this matters
Performance issues directly impact user engagement and conversion rates.
●Uses HTTPS
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
92
SEO
These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.
Content Best Practices
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image |
div.channel > div.object-media__img > a.-ribbon > img.image div.channel > div.object-media__img > a.-ribbon > img.image |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
div.coub-description__about__inner > div.coub-description__avatar > a > img.image div.coub-description__about__inner > div.coub-description__avatar > a > img.image |
div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img div.fullscreen-changer__animation_container > div.viewer > div.contents > img.viewer__img |
Format your HTML in a way that enables crawlers to better understand your app’s content.
○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Document has a valid `hreflang`
○Document has a valid `rel=canonical`