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Autoplay guide for media and Web Audio APIs - Web media technologies
while
autoplay of media serves a useful purpose, it should be used carefully and only when needed.
... in order to give users control over this, browsers often provide various forms of
autoplay blocking.
... in this guide, we'll cover
autoplay functionality in the various media and web audio apis, including a brief overview of how to use
autoplay and how to work with browsers to handle
autoplay blocking gracefully.
...And 49 more matches
HTMLMediaElement.autoplay - Web APIs
the htmlmediaelement.
autoplay property reflects the
autoplay html attribute, indicating whether playback should automatically begin as soon as enough media is available to do so without interruption.
... a media element whose source is a mediastream and whose
autoplay property is true will begin playback when it becomes active (that is, when mediastream.active becomes true).
...if you must offer
autoplay functionality, you should make it opt-in (requiring a user to specifically enable it).
...And 7 more matches
Feature-Policy: autoplay - HTTP
the http feature-policy header
autoplay directive controls whether the current document is allowed to
autoplay media requested through the htmlmediaelement interface.
...the
autoplay attribute on <audio> and <video> elements will be ignored.
... for more details on
autoplay and
autoplay blocking, see the article
autoplay guide for media and web audio apis.
... syntax feature-policy:
autoplay <allowlist>; <allowlist> an allowlist is a list of origins that takes one or more of the following values, separated by spaces: *: the feature will be allowed in this document, and all nested browsing contexts (iframes) regardless of their origin.
<audio>: The Embed Audio element - HTML: Hypertext Markup Language
in a similar manner to the <img> element, we include a path to the media we want to embed inside the src attribute; we can include other attributes to specify information such as whether we want it to
autoplay and loop, whether we want to show the browser's default audio controls, etc.
...
autoplay a boolean attribute: if specified, the audio will automatically begin playback as soon as it can do so, without waiting for the entire audio file to finish downloading.
...if you must offer
autoplay functionality, you should make it opt-in (requiring a user to specifically enable it).
...And 6 more matches
<video>: The Video Embed element - HTML: Hypertext Markup Language
in a similar manner to the <img> element, we include a path to the media we want to display inside the src attribute; we can include other attributes to specify information such as video width and height, whether we want it to
autoplay and loop, whether we want to show the browser's default video controls, etc.
...
autoplay a boolean attribute; if specified, the video automatically begins to play back as soon as it can do so without stopping to finish loading the data.
...if you must offer
autoplay functionality, you should make it opt-in (requiring a user to specifically enable it).
...And 6 more matches
Audio for Web games - Game development
autoplay browser
autoplay policy now affects desktop and mobile browsers.
... it is worth noting that
autoplay with sound is allowed if: the user has interacted with the domain.
...you can find out more about best practises with the
autoplay policy here.
...And 4 more matches
Audio and Video Delivery - Developer guides
for further info see cross browser audio basics (html5 audio in detail) html video <video controls width="640" height="480" poster="initialimage.png"
autoplay muted> <source src="videofile.mp4" type="video/mp4"> <!-- fallback for browsers that don't support mp4 --> <source src="videofile.webm" type="video/webm"> <!-- specifying subtitle files --> <track src="subtitles_en.vtt" kind="subtitles" srclang="en" label="english"> <track src="subtitles_no.vtt" kind="subtitles" srclang="no" label="norwegian"> <!-- fallback for browsers that don'...
...we instruct the video to
autoplay but to be muted by default.
... note: the
autoplay attribute may be ignored by some mobile browsers.
...And 3 more matches
Using the Web Audio API - Web APIs
controlling sound programmatically from javascript code is covered by browsers'
autoplay support policies, as such is likely to be blocked without permission being granted by the user (or a whitelist).
...
autoplay policies typically require either explicit permission or a user engagement with the page before scripts can trigger audio to play.
...you can learn more about this in our article
autoplay guide for media and web audio apis.
...And 2 more matches
Cross-browser audio basics - Developer guides
autoplay specifying
autoplay will cause the audio to start playing as soon as possible and without any user interaction — in short, the audio will
autoplay.
... <audio
autoplay> ...
...plus browsers have policies that will block
autoplay entirely in many situations.
...And 2 more matches
Video and audio content - Learn web development
take a look at our next example: <video controls width="400" height="400"
autoplay loop muted preload="auto" poster="poster.png"> <source src="rabbit320.mp4" type="video/mp4"> <source src="rabbit320.webm" type="video/webm"> <p>your browser doesn't support html video.
...
autoplay makes the audio or video start playing right away, while the rest of the page is loading.
... you are advised not to use
autoplaying video (or audio) on your sites, because users can find it really annoying.
... preload used for buffering large files; it can take one of three values: "none" does not buffer the file "auto" buffers the media file "metadata" buffers only the metadata for the file you can find the above example available to play live on github (also see the source code.) note that we haven't included the
autoplay attribute in the live version — if the video starts to play as soon as the page loads, you don't get to see the poster!
Multimedia: video - Learn web development
optimizing video delivery it's best to compress all video, optimize <source> order, set
autoplay, remove audio from muted video, optimize video preload, and consider streaming the video.
... video
autoplay to ensure that a looping background video
autoplays, you must add several attributes to the video tag:
autoplay, muted, and playsinline.
... <video
autoplay="" loop="" muted="true" playsinline="" src="backgroundvideo.mp4"> while the loop and
autoplay make sense for a looping and
autoplaying video, the muted attribute is required for
autoplay in mobile browsers.
... <video
autoplay="" loop="" muted="true" playsinline="" id="hero-video"> <source src="banner_video.webm" type='video/webm; codecs="vp8, vorbis"'> <source src="web_banner.mp4" type="video/mp4"> </video> this hero-video code (above) is common to conference websites and corporate home pages.
HTMLMediaElement - Web APIs
htmlmediaelement.
autoplay a boolean that reflects the
autoplay html attribute, indicating whether playback should automatically begin as soon as enough media is available to do so without interruption.
...see the
autoplay guide for media and web audio apis for more information.
... keep in mind that browsers may ignore
autoplay requests, so you should ensure that your code isn't dependent on
autoplay working.
... play fired when the paused property is changed from true to false, as a result of the htmlmediaelement.play() method, or the
autoplay attribute playing fired when playback is ready to start after having been paused or delayed due to lack of data progress fired periodically as the browser loads a resource.
Web media technologies
autoplay guide for media and web audio apis unexpected automatic playback of media or audio can be an unwelcome surprise to users.
... while
autoplay serves a purpose, it should be used carefully.
... to give users control over this, many browsers now provide forms of
autoplay blocking.
... this article is a guide to
autoplay, with tips on when and how to use it and how to work with browsers to handle
autoplay blocking gracefully.
Introduction to web APIs - Learn web development
ctor('.volume'); const audiosource = audioctx.createmediaelementsource(audioelement); next up we include a couple of event handlers that serve to toggle between play and pause when the button is pressed and reset the display back to the beginning when the song has finished playing: // play/pause audio playbtn.addeventlistener('click', function() { // check if context is in suspended state (
autoplay policy) if (audioctx.state === 'suspended') { audioctx.resume(); } // if track is stopped, play it if (this.getattribute('class') === 'paused') { audioelement.play(); this.setattribute('class', 'playing'); this.textcontent = 'pause' // if track is playing, stop it } else if (this.getattribute('class') === 'playing') { audioelement.pause()...
...as an example, the notifications api asks for permission using a pop-up dialogue box: the web audio and htmlmediaelement apis are subject to a security mechanism called
autoplay policy — this basically means that you can't automatically play audio when a page loads — you've got to allow your users to initiate audio play through a control like a button.
... this is done because
autoplaying audio is usually really annoying and we really shouldn't be subjecting our users to it.
Experimental features in Firefox
nightly 33 no developer edition 33 no beta 33 no release 33 no preference name media.track.enabled dom document property:
autoplaypolicy the document property
autoplaypolicy returns a string indicating how the browser handles requests to automatically play media (either using the
autoplay property on a media element or by attempting to trigger playback from javascript code.
...potential values include allowed (
autoplay is currently permitted), allowed-muted (
autoplay is allowed but only with no—or muted—audio), and disallowed (
autoplay is not allowed at this time).
... nightly 66 no developer edition 66 no beta 66 no release 66 no preference name dom.media.
autoplay.
autoplay-policy-api geometryutils methods: convertpointfromnode(), convertrectfromnode(), and convertquadfromnode() the geometryutils methods convertpointfromnode(), convertrectfromnode(), and convertquadfromnode() map the given point, rectangle, or quadruple from the node on which they're called to another node.
HTMLMediaElement: play event - Web APIs
the play event is fired when the paused property is changed from true to false, as a result of the play method, or the
autoplay attribute.
...either the ' + 'play() method was called or the
autoplay attribute was toggled.'); }); using the onplay event handler property: const video = document.queryselector('video'); video.onplay = (event) => { console.log('the boolean paused property is now false.
... either the ' + 'play() method was called or the
autoplay attribute was toggled.'); }; specifications specification status html living standardthe definition of 'play media event' in that specification.
Recording a media element - Web APIs
<div class="left"> <div id="startbutton" class="button"> start </div> <h2>preview</h2> <video id="preview" width="160" height="120"
autoplay muted></video> </div> we present our main interface in two columns.
...note that the
autoplay attribute is used so that as soon as the stream starts to arrive from the camera, it immediately gets displayed, and the muted attribute is specified to ensure that the sound from the user's microphone isn't output to their speakers, causing an ugly feedback loop.
...notice that the playback panel doesn't have
autoplay set (so the playback doesn't start as soon as media arrives), and it has controls set, which tells it to show the user controls to play, pause, and so forth.
Web Audio API best practices - Web APIs
autoplay policy browsers have started to implement an
autoplay policy, which in general can be summed up as: "create or resume context from inside a user gesture".
...this is because
autoplaying audio can be really annoying and obtrusive.
... const audioctx = new audiocontext(); const button = document.queryselector('button'); button.addeventlistener('click', function() { // check if context is in suspended state (
autoplay policy) if (audioctx.state === 'suspended') { audioctx.resume(); } }, false); you might instead be working with an offlineaudiocontext, in which case you can resume the suspended audio context with the startrendering() method.
HTMLMediaElement: pause event - Web APIs
either the ' + 'pause() method was called or the
autoplay attribute was toggled.'); }); using the onpause event handler property: const video = document.queryselector('video'); video.onpause = (event) => { console.log('the boolean paused property is now true.
... either the ' + 'pause() method was called or the
autoplay attribute was toggled.'); }; specifications specification status html living standardthe definition of 'pause media event' in that specification.
HTMLMediaElement.play() - Web APIs
usage notes although the term "
autoplay" is usually thought of as referring to pages that immediately begin playing media upon being loaded, web browsers'
autoplay policies also apply to any script-initiated playback of media, including calls to play().
... for even more in-depth information about
autoplay and
autoplay blocking, see our article
autoplay guide for media and web audio apis.
Index - Web APIs
1768 htmlmediaelement.
autoplay api, audio, html dom, htmlmediaelement, media, needsexample, property, video, web,
autoplay the htmlmediaelement.
autoplay property reflects the
autoplay html attribute, indicating whether playback should automatically begin as soon as enough media is available to do so without interruption.
... 1820 htmlmediaelement: play event audio, event, htmlmediaelement, reference, video the play event is fired when the paused property is changed from true to false, as a result of the play method, or the
autoplay attribute.
MediaStreamConstraints.audio - Web APIs
html content <p>click the start button below to begin the demonstration.</p> <div id="startbutton" class="button"> start </div> <audio id="audio"
autoplay controls></audio><br> <div id="log"></div> css content body { font: 14px "open sans", "arial", sans-serif; } audio { margin-top: 20px; border: 1px solid black; width: 160px; } .button { cursor: pointer; width: 160px; border: 1px solid black; font-size: 16px; text-align: center; padding-top: 2px; padding-bottom: 4px; color: white; background-color: darkgreen; } javas...
... result using a mediatrackconstraints object now let's look at a similar example that uses a set of constraints based on the mediatrackconstraints dictionary: html content <p>click the start button below to begin the demonstration.</p> <div id="startbutton" class="button"> start </div> <audio id="audio"
autoplay controls></audio><br> <div id="log"></div> css content body { font: 14px "open sans", "arial", sans-serif; } audio { margin-top: 20px; border: 1px solid black; width: 160px; } .button { cursor: pointer; width: 160px; border: 1px solid black; font-size: 16px; text-align: center; padding-top: 2px; padding-bottom: 4px; color: white; background-color: darkgreen; } javas...
MediaStreamConstraints.video - Web APIs
html content <p>click the start button below to begin the demonstration.</p> <div id="startbutton" class="button"> start </div> <video id="video" width="160" height="120"
autoplay></video><br> <div id="log"></div> css content body { font: 14px "open sans", "arial", sans-serif; } video { margin-top: 20px; border: 1px solid black; } .button { cursor: pointer; width: 160px; border: 1px solid black; font-size: 16px; text-align: center; padding-top: 2px; padding-bottom: 4px; color: white; background-color: darkgreen; } javascript content let videoe...
... result using a mediatrackconstraints object now let's look at a similar example that uses a set of constraints based on the mediatrackconstraints dictionary: html content <p>click the start button below to begin the demonstration.</p> <div id="startbutton" class="button"> start </div> <video id="video" width="160" height="120"
autoplay></video><br> <div id="log"></div> css content body { font: 14px "open sans", "arial", sans-serif; } video { margin-top: 20px; border: 1px solid black; } .button { cursor: pointer; width: 160px; border: 1px solid black; font-size: 16px; text-align: center; padding-top: 2px; padding-bottom: 4px; color: white; background-color: darkgreen; } javascript content let videoe...
Animating textures in WebGL - Web APIs
getting access to the video the first step is to create the <video> element that we'll use to retrieve the video frames: // will set to true when video can be copied to texture var copyvideo = false; function setupvideo(url) { const video = document.createelement('video'); var playing = false; var timeupdate = false; video.
autoplay = true; video.muted = true; video.loop = true; // waiting for these 2 events ensures // there is data in the video video.addeventlistener('playing', function() { playing = true; checkready(); }, true); video.addeventlistener('timeupdate', function() { timeupdate = true; checkready(); }, true); video.src = url; video.play(); function checkready() { ...
...we set it to
autoplay, mute the sound, and loop the video.
Signaling and video calling - Web APIs
this requires video elements, and a button to hang up the call: <div class="flexchild" id="camera-container"> <div class="camera-box"> <video id="received_video"
autoplay></video> <video id="local_video"
autoplay muted></video> <button id="hangup-button" onclick="hangupcall();" disabled> hang up </button> </div> </div> the page structure defined here is using <div> elements, giving us full control over the page layout by enabling the use of css.
...we specify the
autoplay attribute, ensuring once the video starts arriving, it immediately plays.
Feature Policy - HTTP
examples of what you can do with feature policy: change the default behavior of
autoplay on mobile and third party videos.
... the features include (see features list): accelerometer ambient light sensor
autoplay camera encrypted media fullscreen geolocation gyroscope magnetometer microphone midi paymentrequest picture-in-picture usb vr / xr examples using feature policy see feature policy demos for example usage of many policies.
Feature-Policy - HTTP
autoplay controls whether the current document is allowed to
autoplay media requested through the htmlmediaelement interface.
...the
autoplay attribute on <audio> and <video> elements will be ignored.
Index - HTTP
64 feature-policy:
autoplay directive, feature policy, feature-policy, http, reference,
autoplay the http feature-policy header
autoplay directive controls whether the current document is allowed to
autoplay media requested through the htmlmediaelement interface.
...the
autoplay attribute on <audio> and <video> elements will be ignored.
AnalyserNode.getFloatFrequencyData() - Web APIs
microphone input const audioele = new audio(); audioele.src = 'my-audio.mp3';//insert file name here audioele.
autoplay = true; audioele.preload = 'auto'; const audiosourcenode = audioctx.createmediaelementsource(audioele); //create analyser node const analysernode = audioctx.createanalyser(); analysernode.fftsize = 256; const bufferlength = analysernode.frequencybincount; const dataarray = new float32array(bufferlength); //set up audio node network audiosourcenode.connect(analysernode); analysernode.connect(aud...
InterventionReportBody - Web APIs
so for example, a script was been stopped because it was significantly slowing down the browser, or the browser's
autoplay policy blocked audio from playing without a user gesture to trigger it.
MediaDevices.ondevicechange - Web APIs
html content <p>click the start button below to begin the demonstration.</p> <div id="startbutton" class="button"> start </div> <video id="video" width="160" height="120"
autoplay></video><br> <div class="left"> <h2>audio devices:</h2> <ul class="devicelist" id="audiolist"></ul> </div> <div class="right"> <h2>video devices:</h2> <ul class="devicelist" id="videolist"></ul> </div> <div id="log"></div> css content body { font: 14px "open sans", "arial", sans-serif; } video { margin-top: 20px; border: 1px solid black; } .button { cursor: pointer; width:...
Media Session API - Web APIs
*/ }); } some user agents disable
autoplay for media elements on mobile devices and require a user gesture to start media.
Capabilities, constraints, and settings - Web APIs
lass="leftside"> <h3>requested audio constraints:</h3> <textarea id="audioconstrainteditor" cols=32 rows=8></textarea> </div> <div class="rightside"> <h3>actual audio settings:</h3> <textarea id="audiosettingstext" cols=32 rows=8 disabled></textarea> </div> </div> <div class="button" id="applybutton"> apply constraints </div> </div> <video id="video"
autoplay></video> <div class="button" id="stopbutton"> stop video </div> <div id="log"> </div> css content body { font: 14px "open sans", "arial", sans-serif; } video { margin-top: 20px; border: 1px solid black; } .button { cursor: pointer; width: 150px; border: 1px solid black; font-size: 16px; text-align: center; padding-top: 2px; padding-bottom: 4px; color: white; backgr...
msPlayToSource - Web APIs
example <video id="videoplayer" src="http://www.contoso.com/clip.mp4" controls
autoplay /> <script type="text/javascript"> // step 1: obtain playtomanager object for app’s current view.
Using the Screen Capture API - Web APIs
click the start capture button to begin.</p> <p><button id="start">start capture</button> <button id="stop">stop capture</button></p> <video id="video"
autoplay></video> <br> <strong>log:</strong> <br> <pre id="log"></pre> the key parts of the html are: a <button> labeled "start capture" which, when clicked, calls the startcapture() function to request access to, and begin capturing, screen contents.
Using DTMF with WebRTC - Web APIs
note that this example is "cheating" by generating both peers in one code stream, rather than having each be a truly separate entity.</p> <audio id="audio"
autoplay controls></audio><br/> <button name="dial" id="dial">dial</button> <div class="log"></div> javascript let's take a look at the javascript code next.
Advanced techniques: Creating and sequencing audio - Web APIs
]'); let isplaying = false; setupsample() .then((sample) => { loadingel.style.display = 'none'; // remove loading screen dtmf = sample; // to be used in our playsample function playbutton.addeventlistener('click', function() { isplaying = !isplaying; if (isplaying) { // start playing // check if context is in suspended state (
autoplay policy) if (audioctx.state === 'suspended') { audioctx.resume(); } currentnote = 0; nextnotetime = audioctx.currenttime; scheduler(); // kick off scheduling requestanimationframe(draw); // start the drawing loop.
CSS selectors - CSS: Cascading Style Sheets
syntax: [attr] [attr=value] [attr~=value] [attr|=value] [attr^=value] [attr$=value] [attr*=value] example: [
autoplay] will match all elements that have the
autoplay attribute set (to any value).
HTTP Index - HTTP
125 feature-policy:
autoplay directive, feature policy, feature-policy, http, reference,
autoplay the http feature-policy header
autoplay directive controls whether the current document is allowed to
autoplay media requested through the htmlmediaelement interface.