This Quirk needsAutoplayPlayPauseEvents is defined in Quirks.cpp/Quirks.h and used in WebCore/html/HTMLMediaElement.cpp See https://github.com/search?q=repo%3AWebKit%2FWebKit%20needsAutoplayPlayPauseEvents&type=code # Archeology: In Bug 195610, it was moved and renamed from: needsAutoplayPlayPauseEventsQuirk() html/HTMLMediaElement.cpp to: allowedAutoplayQuirks() page/Quirks.cpp It was initially added by Bug 169235 on Mar 9, 2017 with https://github.com/WebKit/WebKit/commit/404d7b85388a24c2990bae01577013d7486ab475 > Add support for an autoplay play-pause events quirk for sites that assume media starts playing. The initial patch was targeting yahoo.com *The day after* another commit was added Bug 169390 on March 10, 2017 https://github.com/WebKit/WebKit/commit/2eeb62365b31efdc9b08c65050a62200e06d5548 with the following comment: > Many sites incorrectly assume media will start off playing and display a pause button from the > start. We can trick many of these sites into updating their controls by sending a "pause" > event when we prevent a media element from playing. > > We don't want this to become standard web behavior, however, since ultimately sites should adapt > to the new behavior. This patch lets clients decide which limited set of sites gets to use auto-play > quirks. Specifically the scoping on Yahoo! was removed applying the patch on any sites deferring it to website policies, probably managed on Safari side. https://github.com/WebKit/WebKit/commit/2eeb62365b31efdc9b08c65050a62200e06d5548#diff-d57d5e5c415e1c8520a5553a39b00ce95a35369bbb3b5a89e979f463b60ea6b6L594-R595 The questions become * How to make sure we can safely remove this Quirk through testing? * What are the steps to reproduce the bug so we can test it? * What is the list of known sites previously impacted?
<rdar://problem/113940803>
Maybe we should rename this bug. And move the "AutoPlay Quirk" back to HTMLMediaElement.cpp as it is more a default with exceptions for a certain number of sites. The website policies list a number of domains where the "AutoPlay Quirk" should NOT be applied.