The following from @dom_walden in T320415#8778687:

Just a couple of observations. I don't know if they are related to this work. I might just raise them as separate bugs.

The vertical alignment of the speaker icon is a bit inconsistent on Vector 2022, Vector 2010 and Monobook. See below for this article on Vector 2022 on Firefox 102:

I also find for Timeless on Chrome the position and size of the speaker icon can change when you play the audio. See below examples taken on Chromium 111 Debian Buster:

(https://en.wikipedia.beta.wmflabs.org/wiki/Phonos?useskin=timeless#Article_fragment)

(https://en.wikipedia.beta.wmflabs.org/wiki/Phonos_RTL?useskin=timeless)

I can reproduce these problems on Chrome 112 on Windows 11 and Mac Ventura. I can reproduce them to a lesser extent on Safari as well.