![]() ![]() If true, audio contexts are only able to play on pages once there has been Sticky activation.Īn integer preference which specifies whether per-domain configuration for autoplay support by default is allowed ( 0), blocked ( 1), or prompt-on-use ( 2). If false, web audio is always allowed to autoplay. webaudioĪ Boolean preference that indicates whether to apply autoplay blocking to the Web Audio API. ![]() If this has been changed to false, media with an audio track will not be permitted to play even if muted. mutedĪ Boolean preference which if true (the default) allows audio media which is currently muted to be automatically played. Setting this value to false disables this capability. This Boolean preference, if true, allows browser extensions' background scripts to autoplay audio media. If this is false, the allowedToPlay property is missing from the HTMLMediaElement interface, and is thus not present on either or elements. This is currently false by default (except in nightly builds, where it's true by default). If you want to start playing the video after the first interaction with the page, setInterval() might be used to achieve this:Ī Boolean preference which specifies whether the HTMLMediaElement.allowedToPlay property is exposed to the web. If that's the case, we should present a user interface to let the user manually start playback that's handled here by a function showPlayButton().Īny other errors are handled as appropriate. This indicates that playback failed due to a permission issue, such as autoplay being denied. This looks at the error's name to see if it's NotAllowedError. We then add a catch() handler to the promise. ![]() ![]() If the promise returned by play() is resolved without error, the then() clause is run and can begin whatever needs to be done when autoplay has begun. Checking for undefined prevents this code from failing with an error on older versions of web browsers. Returning a promise to allow you to determine success or failure of the operation was added more recently. We check for this because in earlier versions of the HTML specification, play() didn't return a value. The first thing we do with the result of play() is make sure it's not undefined. getAutoplayPolicy (video ) = "allowed" ) If autoplay is only allowed for inaudible content, we mute the audio if autoplay is disallowed, we make sure that a placeholder image is displayed for the video. The code assumes video is an HTMLVideoElement media element using the tag or HTMLVideoElement, and that it is configured to autoplay with audio by default. The example below shows how you pass the mediaelement string to get the autoplay policy for all media elements in the document (pass audiocontext to get the policy for audio contexts). all media elements, or all audio contexts) in a document, or to check whether a specific media element or audio context can autoplay. The Navigator.getAutoplayPolicy() method can be used to check the autoplay policy for a type of media feature (i.e. Similarly, if you know that autoplay is not allowed at all, you might provide a default image for the video (using the poster attribute), or choose to defer loading the video until it is requested. If autoplay is important for your application, you may need to customize behavior based on whether or not autoplay is allowed, disallowed, or only supported for inaudible content.įor example, if your application needs to autoplay a video and you know that the page only allows the autoplay of inaudible content, you can either mute it or supply a video with no audio track. Html Example 2: Detecting whether autoplay is allowed ![]()
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