HTML5 Audio Width Is Always The Same In Firefox 56

Question

When adding an audio element to a website in earlier versions of Firefox, you can set the width of the audio element as follows:

<audio controls style="width: 500px">
  <source src="x.mp3" type="audio/mpeg">
</audio>

However, this is now impossible. Regardless of whether I set 500px or 600px, the player always has the same width. This was not a problem in earlier versions of Firefox.

Is there something I did wrong or is it a Firefox bug? In Chrome, for example, everything works.

Answer 1

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Answer 2

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, ( ): https://bugzilla.mozilla.org/show_bug.cgi?id=1409552