Autoplay policy (pending)

[dascritch]

As in Chrome cf https://developers.google.com/web/updates/2017/09/autoplay-policy-changes ,
Firefox Nightly (63) is testing blocking autoplay due to abuse. We're both impacted https://bugzilla.mozilla.org/show_bug.cgi?id=1476853

Note : To do the tests, don't reload the browser, but follow the links. Yes, it's ugly.

[dascritch]

Try the feature policy iframe delegation ? https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#iframe

<iframe src="https://cross-origin.com/myvideo.html" allow="autoplay">

Or may be document.hasFocus() ? https://developer.mozilla.org/fr/docs/Web/API/Document/hasFocus

keep an eye on :

• https://winaero.com/blog/manage-audio-focus-across-tabs-google-chrome/
• https://www.ghacks.net/2016/11/11/chrome-new-audio-focus-feature-launches/
• https://www.tenforums.com/tutorials/112811-manage-audio-focus-across-tabs-google-chrome-windows.html
• https://www.tenforums.com/tutorials/116467-allow-block-sites-play-sound-google-chrome.html

[dascritch]

https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API/Best_practices#Autoplay_policy

[dascritch]

Happens in Chrome when reloading a playing page

[dascritch]

A paper by Chrome https://developers.google.com/web/updates/2018/11/web-audio-autoplay

[dascritch]

Really interesting way to detect it, to check onto Chrome, Firefox and Safari
https://stackoverflow.com/questions/37674223/domexception-failed-to-load-because-no-supported-source-was-found#answer-40238567

[dascritch]

A really interesting paper :
https://www.fxsitecompat.dev/en-CA/docs/2019/audible-media-s-autoplay-is-now-blocked-by-default/

async function play_video() {
  const $video = document.querySelector('video');

  // Detect in advance
  if ($video.allowedToPlay) {
    $video.play();
    // video started to play
  } else {
    // autoplay will be blocked
    // show a play button
  }

  // or use Promise
  try {
    await $video.play();
    // video started to play
  } catch (ex) {
    // autoplay has been blocked
    // show a play button
  }
}

Our problems are mainly in Firefox Nightly, not in main Firefox . In Chrome, we got « Uncaught (in promise) DOMException »

[dascritch]

Still some issues on Firefox Nightly on tests-minimal.html and tests-interface.html , about async tests collisions ?
Seems related to https://bugzilla.mozilla.org/show_bug.cgi?id=1507193 , only nightly/dev because not happening in Firefox vanilla.