- URL: https://cltv.film/
- Date: 09/06/24 09:24:47
Webpage Performance Test Result
- Settings: Desktop
v128
Cable
Frankfurt, Germany
More
- Test runs: 1
- Connectivity: 5000/1000 Kbps, 28ms Latency
- Custom Metrics
View:
Lighthouse Report
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Performance 60
Lighthouse Metrics
Values are estimated and may vary.
The performance score is calculated directly from these metrics. See calculator.
First Contentful Paint | Speed Index | Largest Contentful Paint | Time to Interactive | Total Blocking Time | Cumulative Layout Shift |
---|---|---|---|---|---|
1.8s | 2.2s | 1.8s | 3.6s | 510ms | 0 |
Aiming to improve? check out our Opportunities & Experiments for suggestions and run No-Code Experiments to see how changes impact this site!
Filmstrip
Opportunities (10)
-
Serve images in next-gen formats
Estimated savings 1.28 s
Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. Learn more about modern image formats.
URL Resource Size (bytes) Potential Savings (bytes) https://cltv.film/media/pages/home/21c7dd93fe-1722349070/origins-screengrab-7.jpg 699316 587781 https://cltv.film/media/pages/home/ce3b6cbc1f-1722503694/dsc01322-2.jpg 667078 368565 https://cltv.film/media/pages/home/58e54127f9-1695739476/cltv-film.jpg 173437 116560 https://cltv.film/media/pages/home/61e52d8b96-1695739508/brand-guinness-lr.jpg 111642 53359 https://cltv.film/media/pages/home/96a47cd62c-1648140926/iloveyou-roll-over.png 36947 32124 https://cltv.film/media/pages/home/55cc39f3b3-1648140922/iloveyou-no-roll-over.png 36415 31750 Efficiently encode images
Estimated savings 0.4 s
Optimized images load faster and consume less cellular data. Learn how to efficiently encode images.
URL Resource Size (bytes) Potential Savings (bytes) https://cltv.film/media/pages/home/21c7dd93fe-1722349070/origins-screengrab-7.jpg 699316 389229 https://cltv.film/media/pages/home/ce3b6cbc1f-1722503694/dsc01322-2.jpg 667078 52368 https://cltv.film/media/pages/home/58e54127f9-1695739476/cltv-film.jpg 173437 16278 Preconnect to required origins
Estimated savings 0.23 s
Consider adding
preconnect
ordns-prefetch
resource hints to establish early connections to important third-party origins. Learn how to preconnect to required origins.URL Potential Savings (ms) https://m.stripe.network 234 https://ssl.google-analytics.com 166 https://js.stripe.com 86 Reduce unused JavaScript
Estimated savings 0.2 s
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.
URL Transfer Size (bytes) Potential Savings (bytes) https://js.stripe.com/v3/ 160736 123496 https://f.vimeocdn.com/p/4.36.16/js/player.module.js 148261 85818 https://cltv.film/assets/js/main.min.js?v=10:24-06.09 89597 65445 Source Source Bytes Source Wasted Bytes ../../node_modules/jquery/dist/jquery.js 28455 18871 ../../src/js/slide/content.js 3926 3921 ../../node_modules/object-inspect/index.js 2958 2358 ../../node_modules/url/url.js 2807 2330 ../../src/js/photoswipe.js 2091 2087 https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 100470 65066 Initial server response time was short
Root document took 80 ms
Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.
URL Time Spent (ms) https://cltv.film/ 75 Eliminate render-blocking resources
View Experiment!Potential savings of 0 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. Learn how to eliminate render-blocking resources.
URL Transfer Size (bytes) Potential Savings (ms) https://js.stripe.com/v3/ 161140 1866 Reduce unused CSS
Potential savings of 20 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.
URL Transfer Size (bytes) Potential Savings (bytes) https://f.vimeocdn.com/p/4.36.16/css/player.css 22971 20842 Remove duplicate modules in JavaScript bundles
Potential savings of 8 KiB
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
Source Transfer Size (bytes) Potential Savings (bytes) ../../src/js/slide/content.js 3926 URL Source Transfer Bytes https://cltv.film/assets/js/main.min.js?v=10:24-06.09 3926 https://cltv.film/assets/js/main.min.js?v=10:24-06.09 3926 Other 3549 URL Source Transfer Bytes https://cltv.film/assets/js/main.min.js?v=10:24-06.09 ../../src/js/core/base.js 1055 URL Source Transfer Bytes https://cltv.film/assets/js/main.min.js?v=10:24-06.09 1055 https://cltv.film/assets/js/main.min.js?v=10:24-06.09 1055 Avoid serving legacy JavaScript to modern browsers
Potential savings of 0 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren't necessary for modern browsers. For your bundled JavaScript, adopt a modern script deployment strategy using module/nomodule feature detection to reduce the amount of code shipped to modern browsers, while retaining support for legacy browsers. Learn how to use modern JavaScript
URL Potential Savings (bytes) https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 48 Location Signal - URL: https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js
- Line: 1
- Column: 315398
@babel/plugin-transform-classes https://js.stripe.com/v3/ 40 Location Signal - URL: https://js.stripe.com/v3/
- Line: 0
- Column: 655240
@babel/plugin-transform-classes https://m.stripe.network/out-4.5.43.js 30 Location Signal - URL: https://m.stripe.network/out-4.5.43.js
- Line: 0
- Column: 6768
@babel/plugin-transform-classes Properly size images
Potential savings of 26 KiB
Serve images that are appropriately-sized to save cellular data and improve load time. Learn how to size images.
URL Resource Size (bytes) Potential Savings (bytes) https://cltv.film/media/pages/home/96a47cd62c-1648140926/iloveyou-roll-over.png 36947 13301 https://cltv.film/media/pages/home/55cc39f3b3-1648140922/iloveyou-no-roll-over.png 36415 13109 Diagnostics (15)
-
Largest Contentful Paint element
1,830 ms
This is the largest contentful element painted within the viewport. Learn more about the Largest Contentful Paint element
Reduce the impact of third-party code
View Experiment!Third-party code blocked the main thread for 400 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading. Learn how to minimize third-party impact.
Third-Party Transfer Size (bytes) Main-Thread Blocking Time Stripe 180025 290 URL Transfer Size Blocking Time https://m.stripe.network/inner.html 1759 164 https://m.stripe.network/out-4.5.43.js 14815 116 https://js.stripe.com/v3/ 161140 10 https://js.stripe.com/v3/m-outer-3437aaddcdf6922d623e172c2d6f9278.html 1064 0 https://m.stripe.com/6 775 0 https://js.stripe.com/v3/fingerprinted/js/m-outer-15a2b40a058ddff1cffdb63779fe3de1.js 472 0 Vimeo 320202 109 URL Transfer Size Blocking Time https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 100727 56 https://player.vimeo.com/video/1005430168?share=copy 10247 35 https://f.vimeocdn.com/p/4.36.16/js/player.module.js 148378 18 https://i.vimeocdn.com/video/1922008348-16a2715daeabd6acb99260887792a06f3832a0c38e3da3558798177190231f85-d?mw=1200&mh=675 33789 0 https://f.vimeocdn.com/p/4.36.16/css/player.css 22971 0 https://i.vimeocdn.com/video/1922008348-16a2715daeabd6acb99260887792a06f3832a0c38e3da3558798177190231f85-d?mw=80&q=85 1712 0 https://f.vimeocdn.com/js_opt/modules/utils/vuid.min.js 1180 0 https://vimeo.com/ablincoln/vuid?pid=ba539773285348048762e0c93e2556d7c13a5c451725614648 1056 0 https://fresnel.vimeocdn.com/add/player-stats?beacon=1&session-id=ba539773285348048762e0c93e2556d7c13a5c451725614648 142 0 Google CDN 29910 0 URL Transfer Size Blocking Time https://www.gstatic.com/eureka/clank/128/cast_sender.js 14973 0 https://www.gstatic.com/cast/sdk/libs/sender/1.0/cast_framework.js 12447 0 https://www.gstatic.com/cv/js/sender/v1/cast_sender.js?loadCastFramework=1 2490 0 Google Analytics 15606 0 URL Transfer Size Blocking Time https://ssl.google-analytics.com/ga.js 15410 0 https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=335686927&utmhn=cltv.film&utmcs=UTF-8&utmsr=800x600&utmvp=1920x993&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=Home%20%7C%20Collective&utmhid=373489597&utmr=-&utmp=%2F&utmht=1725614648206&utmac=UA-148927640-1&utmcc=__utma%3D44372854.528651474.1725614648.1725614648.1725614648.1%3B%2B__utmz%3D44372854.1725614648.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=2040242421&utmredir=1&utmu=qAAAAAAgAAAAAAAAAAAAAAAE~ 196 0 Some third-party resources can be lazy loaded with a facade
1 facade alternative available
Some third-party embeds can be lazy loaded. Consider replacing them with a facade until they are required. Learn how to defer third-parties with a facade.
Product Transfer Size (bytes) Main-Thread Blocking Time Vimeo Embedded Player (Video) 320202 109 URL Transfer Size Blocking Time https://f.vimeocdn.com/p/4.36.16/js/player.module.js 148378 18 https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 100727 56 https://i.vimeocdn.com/video/1922008348-16a2715daeabd6acb99260887792a06f3832a0c38e3da3558798177190231f85-d?mw=1200&mh=675 33789 0 https://f.vimeocdn.com/p/4.36.16/css/player.css 22971 0 https://player.vimeo.com/video/1005430168?share=copy 10247 35 Other resources 4090 0 Minimize main-thread work
2.2 s
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
Category Time Spent Script Evaluation 1291 Other 478 Style & Layout 309 Script Parsing & Compilation 57 Parse HTML & CSS 24 Rendering 21 Garbage Collection 8 Page prevented back/forward cache restoration
1 failure reason
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
Failure reason Failure type Pages that use WebXR are not currently eligible for back/forward cache. Actionable Frame Url https://player.vimeo.com/video/1005430168?share=copy Avoid chaining critical requests
4 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load. Learn how to avoid chaining critical requests.
-
https://cltv.film/
2kb
-
https://cltv.film/assets/css/style.css?v=10:24-06.09
7kb
- https://cltv.film/node_modules/photoswipe/dist/photoswipe.css 2kb
- https://cltv.film/assets/fonts/mabry-regular.woff2 30kb
- https://cltv.film/site.webmanifest 3kb
- https://js.stripe.com/v3/ 157kb
-
https://cltv.film/assets/css/style.css?v=10:24-06.09
7kb
Ensure text remains visible during webfont load
View Experiment!Leverage the
font-display
CSS feature to ensure text is user-visible while webfonts are loading. Learn more aboutfont-display
.URL Potential Savings https://cltv.film/assets/fonts/mabry-regular.woff2 1420 Avoids enormous network payloads
Total size was 2,361 KiB
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
URL Transfer Size (bytes) https://cltv.film/media/pages/home/21c7dd93fe-1722349070/origins-screengrab-7.jpg 699777 https://cltv.film/media/pages/home/ce3b6cbc1f-1722503694/dsc01322-2.jpg 667512 https://cltv.film/media/pages/home/58e54127f9-1695739476/cltv-film.jpg 173601 https://js.stripe.com/v3/ 161140 https://f.vimeocdn.com/p/4.36.16/js/player.module.js 148378 https://cltv.film/media/pages/home/61e52d8b96-1695739508/brand-guinness-lr.jpg 111746 https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 100727 https://cltv.film/assets/js/main.min.js?v=10:24-06.09 89672 https://cltv.film/media/pages/home/96a47cd62c-1648140926/iloveyou-roll-over.png 37014 https://cltv.film/media/pages/home/55cc39f3b3-1648140922/iloveyou-no-roll-over.png 36491 Avoid long main-thread tasks
14 long tasks found
Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay. Learn how to avoid long main-thread tasks
URL Start Time Duration https://m.stripe.network/out-4.5.43.js 2386 266 https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 2973 199 https://m.stripe.network/out-4.5.43.js 2690 150 https://cltv.film/ 756 141 https://cltv.film/assets/js/main.min.js?v=10:24-06.09 899 96 https://cltv.film/ 1733 93 https://js.stripe.com/v3/ 665 81 https://f.vimeocdn.com/p/4.36.16/js/player.module.js 3312 71 https://m.stripe.network/out-4.5.43.js 2909 62 https://m.stripe.network/out-4.5.43.js 2854 55 https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 3244 53 https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 3432 53 https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 3179 52 https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 3508 50 JavaScript execution time
1.2 s
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.
URL Total CPU Time Script Evaluation Script Parse https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 487 411 1 Unattributable 328 2 0 https://m.stripe.network/out-4.5.43.js 325 314 8 https://cltv.film/ 230 5 0 https://m.stripe.network/inner.html 218 217 0 https://player.vimeo.com/video/1005430168?share=copy 185 6 2 https://cltv.film/assets/js/main.min.js?v=10:24-06.09 117 96 18 https://js.stripe.com/v3/ 91 70 19 https://f.vimeocdn.com/p/4.36.16/js/player.module.js 76 71 2 Avoids an excessive DOM size
46 elements
A large DOM will increase memory usage, cause longer style calculations, and produce costly layout reflows. Learn how to avoid an excessive DOM size.
Statistic Element Value Total DOM Elements Maximum DOM Depth nav.left > ul > li > a.t_nav Maximum Child Elements body.home Avoid large layout shifts
1 element found
These DOM elements were most affected by layout shifts. Some layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS
Element Layout shift impact footer.footer > ul.t_nav > li > a 0 Image elements do not have explicit
View Experiment!width
andheight
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
URL https://cltv.film/media/site/2f06f77c88-1646669339/cltvlogo.svg https://cltv.film/media/pages/home/55cc39f3b3-1648140922/iloveyou-no-roll-over.png https://cltv.film/media/pages/home/96a47cd62c-1648140926/iloveyou-roll-over.png Serve static assets with an efficient cache policy
21 resources found
A long cache lifetime can speed up repeat visits to your page. Learn more about efficient cache policies.
URL Cache TTL Transfer Size (bytes) https://cltv.film/media/pages/home/21c7dd93fe-1722349070/origins-screengrab-7.jpg 0 699777 https://cltv.film/media/pages/home/ce3b6cbc1f-1722503694/dsc01322-2.jpg 0 667512 https://cltv.film/media/pages/home/58e54127f9-1695739476/cltv-film.jpg 0 173601 https://cltv.film/media/pages/home/61e52d8b96-1695739508/brand-guinness-lr.jpg 0 111746 https://cltv.film/assets/js/main.min.js?v=10:24-06.09 0 89672 https://cltv.film/media/pages/home/96a47cd62c-1648140926/iloveyou-roll-over.png 0 37014 https://cltv.film/media/pages/home/55cc39f3b3-1648140922/iloveyou-no-roll-over.png 0 36491 https://cltv.film/assets/fonts/mabry-regular.woff2 0 30266 https://cltv.film/assets/css/style.css?v=10:24-06.09 0 6693 https://cltv.film/node_modules/photoswipe/dist/photoswipe.css 0 2438 https://cltv.film/media/site/2f06f77c88-1646669339/cltvlogo.svg 0 882 https://js.stripe.com/v3/ 60000 161140 https://m.stripe.network/out-4.5.43.js 300000 14815 https://ssl.google-analytics.com/ga.js 7200000 15410 https://www.gstatic.com/eureka/clank/128/cast_sender.js 86400000 14973 https://f.vimeocdn.com/p/4.36.16/js/player.module.js 1209600000 148378 https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js 1209600000 100727 https://f.vimeocdn.com/p/4.36.16/css/player.css 1209600000 22971 https://i.vimeocdn.com/video/1922008348-16a2715daeabd6acb99260887792a06f3832a0c38e3da3558798177190231f85-d?mw=1200&mh=675 2592000000 33789 https://i.vimeocdn.com/video/1922008348-16a2715daeabd6acb99260887792a06f3832a0c38e3da3558798177190231f85-d?mw=80&q=85 2592000000 1712 https://f.vimeocdn.com/js_opt/modules/utils/vuid.min.js 2592000000 1180 Does not use passive listeners to improve scrolling performance
Consider marking your touch and wheel event listeners as
passive
to improve your page's scroll performance. Learn more about adopting passive event listeners.Source - URL: https://f.vimeocdn.com/p/4.36.16/js/vendor.module.js
- Line: 1
- Column: 339409
Passed Audits (14)
-
Avoid multiple page redirects
Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.
Enable text compression
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. Learn more about text compression.
Preload key requests
Consider using
<link rel=preload>
to prioritize fetching resources that are currently requested later in page load. Learn how to preload key requests.Minify JavaScript
Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.
Minify CSS
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Preload Largest Contentful Paint image
If the LCP element is dynamically added to the page, you should preload the image in order to improve LCP. Learn more about preloading LCP elements.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. Consider using MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF to save network bytes. Learn more about efficient video formats
Largest Contentful Paint image was not lazily loaded
Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint. Learn more about optimal lazy loading.
Element body.home > main.main > div.quarters > div.quarters_quarter Has a
<meta name="viewport">
tag withwidth
orinitial-scale
A
<meta name="viewport">
not only optimizes your app for mobile screen sizes, but also prevents a 300 millisecond delay to user input. Learn more about using the viewport meta tag.Avoid non-composited animations
Animations which are not composited can be janky and increase CLS. Learn how to avoid non-composited animations
Defer offscreen images
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. Learn how to defer offscreen images.
Use HTTP/2
HTTP/2 offers many benefits over HTTP/1.1, including binary headers and multiplexing. Learn more about HTTP/2.
User Timing marks and measures
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences. Learn more about User Timing marks.
Avoids
document.write()
For users on slow connections, external scripts dynamically injected via
document.write()
can delay page load by tens of seconds. Learn how to avoid document.write().Accessibility 86
Names and labels (2)
-
<frame>
or<iframe>
elements do not have a titleScreen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.
Failing Elements body.home > main.main > div.reel > iframe Fix any of the following:
Element has no title attribute
aria-label attribute does not exist or is empty
aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
Element's default semantics were not overridden with role="none" or role="presentation"Links do not have a discernible name
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.
Failing Elements body.home > main.main > div.quarters > a.reellink Fix all of the following:
Element is in tab order and does not have accessible text
Fix any of the following:
Element does not have text that is visible to screen readers
aria-label attribute does not exist or is empty
aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
Element has no title attributefooter.footer > ul.t_nav > li > a Fix all of the following:
Element is in tab order and does not have accessible text
Fix any of the following:
Element does not have text that is visible to screen readers
aria-label attribute does not exist or is empty
aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
Element has no title attributeAdditional Items to Check Manually (10)
-
Interactive controls are keyboard focusable
Custom interactive controls are keyboard focusable and display a focus indicator. Learn how to make custom controls focusable.
Interactive elements indicate their purpose and state
Interactive elements, such as links and buttons, should indicate their state and be distinguishable from non-interactive elements. Learn how to decorate interactive elements with affordance hints.
The page has a logical tab order
Tabbing through the page follows the visual layout. Users cannot focus elements that are offscreen. Learn more about logical tab ordering.
Visual order on the page follows DOM order
DOM order matches the visual order, improving navigation for assistive technology. Learn more about DOM and visual ordering.
User focus is not accidentally trapped in a region
A user can tab into and out of any control or region without accidentally trapping their focus. Learn how to avoid focus traps.
The user's focus is directed to new content added to the page
If new content, such as a dialog, is added to the page, the user's focus is directed to it. Learn how to direct focus to new content.
HTML5 landmark elements are used to improve navigation
Landmark elements (`<main>`, `<nav>`, etc.) are used to improve the keyboard navigation of the page for assistive technology.
Offscreen content is hidden from assistive technology
Offscreen content is hidden with display: none or aria-hidden=true. Learn how to properly hide offscreen content.
Custom controls have associated labels
Custom interactive controls have associated labels, provided by aria-label or aria-labelledby. Learn more about custom controls and labels.
Custom controls have ARIA roles
Custom interactive controls have appropriate ARIA roles. Learn how to add roles to custom controls.
Passed Audits (13)
-
Values assigned to
role=""
are valid ARIA roles.ARIA
role
s enable assistive technologies to know the role of each element on the web page. If therole
values are misspelled, not existing ARIArole
values, or abstract roles, then the purpose of the element will not be communicated to users of assistive technologies. Learn more about ARIA roles.[aria-hidden="true"]
is not present on the document<body>
Assistive technologies, like screen readers, work inconsistently when
aria-hidden="true"
is set on the document<body>
. Learn howaria-hidden
affects the document body.[aria-hidden="true"]
elements do not contain focusable descendentsFocusable descendents within an
[aria-hidden="true"]
element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn howaria-hidden
affects focusable elements.Background and foreground colors have a sufficient contrast ratio
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Document has a
<title>
elementThe title gives screen reader users an overview of the page, and search engine users rely on it heavily to determine if a page is relevant to their search. Learn more about document titles.
Heading elements appear in a sequentially-descending order
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.
<html>
element has a[lang]
attributeIf 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 thelang
attribute.<html>
element has a valid value for its[lang]
attributeSpecifying a valid BCP 47 language helps screen readers announce text properly. Learn how to use the
lang
attribute.Image elements have
[alt]
attributesInformative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the
alt
attribute.Image elements do not have
[alt]
attributes that are redundant text.Informative elements should aim for short, descriptive alternative text. Alternative text that is exactly the same as the text adjacent to the link or image is potentially confusing for screen reader users, because the text will be read twice. Learn more about the
alt
attribute.Lists contain only
<li>
elements and script supporting elements (<script>
and<template>
).Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.
List items (
<li>
) are contained within<ul>
,<ol>
or<menu>
parent elementsScreen readers require list items (
<li>
) to be contained within a parent<ul>
,<ol>
or<menu>
to be announced properly. Learn more about proper list structure.[user-scalable="no"]
is not used in the<meta name="viewport">
element and the[maximum-scale]
attribute is not less than 5.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.
Not Applicable (39)
-
[accesskey]
values are uniqueAccess keys let users quickly focus a part of the page. For proper navigation, each access key must be unique. Learn more about access keys.
[aria-*]
attributes match their rolesEach ARIA
role
supports a specific subset ofaria-*
attributes. Mismatching these invalidates thearia-*
attributes. Learn how to match ARIA attributes to their roles.button
,link
, andmenuitem
elements have accessible namesWhen an element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to make command elements more accessible.
Elements with
role="dialog"
orrole="alertdialog"
have accessible names.ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.
ARIA input fields have accessible names
When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about input field labels.
ARIA
meter
elements have accessible namesWhen a meter element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to name
meter
elements.ARIA
progressbar
elements have accessible namesWhen a
progressbar
element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to labelprogressbar
elements.[role]
s have all required[aria-*]
attributesSome ARIA roles have required attributes that describe the state of the element to screen readers. Learn more about roles and required attributes.
Elements with an ARIA
[role]
that require children to contain a specific[role]
have all required children.Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.
[role]
s are contained by their required parent elementSome ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.
[role]
values are validARIA roles must have valid values in order to perform their intended accessibility functions. Learn more about valid ARIA roles.
Elements with the
role=text
attribute do not have focusable descendents.Adding
role=text
around a text node split by markup enables VoiceOver to treat it as one phrase, but the element's focusable descendents will not be announced. Learn more about therole=text
attribute.ARIA toggle fields have accessible names
When a toggle field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about toggle fields.