Various MediaWiki instances make it hard to me to make changes since the edit window is severely impaired having strange fonts.
Adding
textarea { font-family:monospace }
to the personal commons.css sometimes helped but not always. Now, on a slow computer, I saw the edit window appear monospaced immediately after the change to common.css, only to watch it being garbled to something hardly readaly immediately thereafter.
I suggest to stop using scripts to mess around with things users already set the way they want it. KISS!
Version: 1.23.0
Severity: minor