![]() ![]() # ExamplesĮxample 1: Every time a user visits on their laptop they watch a TV show or a movie. Older articles incorrectly recommend using the attribute gesture=media which is not supported. And the autoplay attribute will also be ignored. When the permissions policy for autoplay is disabled, calls to play() without a user gesture will reject the promise with a NotAllowedError DOMException. Note that autoplay is allowed by default on same-origin iframes. Once an origin has received autoplay permission, it can delegate that permission to cross-origin iframes with the permissions policy for autoplay. Do this with flags: chrome.exe -disable-features=PreloadMediaEngagementData, MediaEngagementBypassAutoplayPolicies.Ī permissions policy allows developers to selectively enable and disable browser features and APIs. You can also decide to make sure autoplay is never allowed by disabling MEI and whether sites with the highest overall MEI get autoplay by default for new users. This allows you to test your website as if user were strongly engaged with your site and playback autoplay would be always allowed. You can disable the autoplay policy entirely by using a command line flag: chrome.exe -autoplay-policy=no-user-gesture-required. # Developer switchesĪs a developer, you may want to change Chrome autoplay policy behavior locally to test your website for different levels of user engagement. Screenshot of the about://media-engagement internal page in Chrome. When it is high enough, media is allowed to autoplay on desktop only.Ī user's MEI is available at the about://media-engagement internal page. Size of the video (in px) must be greater than 200x140.įrom that, Chrome calculates a media engagement score, which is highest on sites where media is played on a regular basis.Consumption of the media (audio/video) must be greater than seven seconds.Chrome's approach is a ratio of visits to significant media playback events per origin: The Media Engagement Index (MEI) measures an individual's propensity to consume media on a site. Top frames can delegate autoplay permission to their iframes to allow autoplay with sound.The user has added the site to their home screen on mobile or installed the PWA on desktop.On desktop, the user's Media Engagement Index threshold has been crossed, meaning the user has previously played video with sound.The user has interacted with the domain (click, tap, etc.).These changes are intended to give greater control of playback to users and to benefit publishers with legitimate use cases. # New behaviorsĪs you may have noticed, web browsers are moving towards stricter autoplay policies in order to improve the user experience, minimize incentives to install ad blockers, and reduce data consumption on expensive and/or constrained networks. My guess, though, is that we'll soon see an extension or option in browsers that will allow you to choose whether a source preloads or not (I would think kind of like how Chrome's Click to Play for plugins works).Internet memes tagged "autoplay" found on Imgflip and Imgur. ![]() My understanding of HTML5 leads me to believe that if the web designer has it set to preload, there's nothing that you can do to tell it not to. Once this change takes place (depends on what version of Chrome you're using), you should see the audio files not preloading unless the RSS feed, webpage, etc, explicitly states that it should preload. (Dev channel should get this update in a few weeks.) The patches to implement preload have now landed! The preload attribute will be finally recognized in Chrome 12. The good news, though, is that this bug has been fixed in the latest developer version of Chrome:Ĭomment 72 by project member Apr 5 (6 days ago) It was a known issue that Chrome ignores the preload attribute, which means it's always preloading the video, even if it's not supposed to. ![]() ![]() The Opera Developer's guide for HTML5, Everything you need to know about HTML5 video and audio states: Unfortunately there doesn't currently seem to be a way to tell Chrome not to download resources until you explicitly request them (I even checked in their Extensions Web Store to see if someone wrote an extension that could do this). ![]()
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