1495817 - Height of <audio> controls could depend on its previous state

Status: NEW

(Toolkit :: Video/Audio Controls, defect, P3)

Description

[Tim Guan-tin Chien [:timdream] (please needinfo)]

STR: See URL.

Expected: both <audio controls> should have the same height

Actual: the one has its height set to 1px, reflowed, and the height removed is shorter.

Note:

The HTML in the URL is:

<audio controls></audio>
<audio controls></audio>
<script>
window.onload = () => {
  var el = document.body.firstChild;
  el.style.height = "1px";
  el.offsetHeight; el.style.height = "";
}
</script>

This is not caused by UA Widget.

This is essentially the height version of bug 1367875. We'll need a reftest with it.

Comment 1

[Daniel Holbert [:dholbert]]

FWIW: I can still reproduce this bug in current Nightly. (I'm in the neighborhood since I noticed that some other similar bugs e.g. bug 1495821 have been fixed since filing -- but this one hasn't been.)

While I'm here, I'll attach the data-URL as an actual testcase attachment, since it seems data-URI-testcases-in-bugzilla's-URL-field don't work anymore (in either Firefox or Chrome).

Comment 2

[Daniel Holbert [:dholbert]]

Attachment: testcase 1: the two audio elements are expected to render the same height (but the one on the left is shorter)