[Webkit-unassigned] [Bug 222225] 'Play' buttons for 'music playing' web app not working at all on iPhone 12 Pro running iOS 14.4

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222225

--- Comment #12 from Jer Noble <jer.noble at apple.com> ---
Aha! It's not an in-band track; there's literally a `<track kind="captions">` with no src= attribute in the DOM. And a track with no src can never progress to a loaded state, and blocks it's parent <audio> element from getting to a .readyState > HAVE_CURRENT_DATA.

There's probably still a bug here; we should probably not include src-less <track> elements when considering whether to block updates to the readyState, but at the  very least there's a client-side workaround available: don't add an empty caption track to the DOM.

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