1406719 - In FF v56, css width property no longer being applied correctly for <audio> tag

Status: RESOLVED DUPLICATE of bug 1397486

(Core :: Layout, defect)

Description

[micolithe]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:56.0) Gecko/20100101 Firefox/56.0
Build ID: 20170926190823

Steps to reproduce:

I updated firefox to v56, and now any <audio> tags that have a css width set as a percentage are not rendering correctly. This worked previously in v55.


Actual results:

When I go to a site with an <audio> tag, the page seems to allocate the size of the tag that it should have, but then never stretches the <audio> tag out to fill it.

Screenshot:
https://micolithe.us/upload/2017-10-08_04-02-58.png

I was able to recreate this on my Windows 7 desktop, and my Windows 10 laptop. I also keep a Windows 10 VM, which has the FF57 beta, and it occurs there too.


Expected results:

The audio tag should fill the entirety of the allocated space, like it did before and does in other browsers.

Comment 1

[Mats Palmgren (inactive)]

It appears to be fixed in Nightly (v58) though.
I'm guessing this is a dupe of bug 1397486.