Possibly related to issue 764133.

This issue seems to be Feature Request. Also CC'ing mlamouri@ for further inputs.

mlamouri@ -- Could you please look into this issue as mentioned behavior is observed.

Thanks!

We do not take audio focus for muted autoplay today but the way we did doesn't work very well with the new autoplay policy: if the page is allowed to autoplay with sound, you will see a notification, even if the playback is muted.

Issue 764133 suggests maybe it plays a silent audio placeholder.  If it's truly just showing a notification but not playing any audio or making any sound-related request, then maybe it's an Android platform bug.  Please double check and advise if I should file an Android bug.

Interesting: it only shows the notification if I already tapped elsewhere on the page, e.g. if I "Liked" a different post several logical pages higher.

 Issue 849479  has been merged into this issue.

Changing to a regression (since it's a change in behavior from a user perspective) and marking as P1

 Issue 714792  has been merged into this issue.

 Issue 853366  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/366dd847d9e3e82674496c103cb5af175a152475

commit 366dd847d9e3e82674496c103cb5af175a152475
Author: Mounir Lamouri <mlamouri@chromium.org>
Date: Tue Jun 19 17:20:04 2018

Autoplay: do not take audio focus until media element plays unmuted.

With the new autoplay policy, the heuristic to take audio focus for
muted autoplay no longer works and web pages ends up stealing audio
focus for no audible reasons.

Bug:  845016 
Change-Id: Ie34d3a66ac5027720fe4ee4546b4c320127f3870
Reviewed-on: https://chromium-review.googlesource.com/1087784
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568506}
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/chrome/android/javatests/src/org/chromium/chrome/browser/media/ui/AutoplayMutedNotificationTest.java
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/content/browser/media/media_web_contents_observer.cc
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/content/public/browser/web_contents_observer.h
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/content/renderer/media/stream/webmediaplayer_ms_unittest.cc
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/content/test/data/media/session/autoplay-muted.html
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/media/blink/webmediaplayer_impl.cc
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/media/blink/webmediaplayer_impl_unittest.cc
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/third_party/blink/public/platform/web_media_player_client.h
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/third_party/blink/renderer/core/html/media/autoplay_policy.cc
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/third_party/blink/renderer/core/html/media/autoplay_policy.h
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/third_party/blink/renderer/core/html/media/html_media_element.cc
[modify] https://crrev.com/366dd847d9e3e82674496c103cb5af175a152475/third_party/blink/renderer/core/html/media/html_media_element.h

Not asking for a merge because the change is a bit involved and we are deep into M68 Beta release. If someone feels strongly, lmk.

 Issue 864969  has been merged into this issue.

 Issue 865148  has been merged into this issue.