Which skin?

Vector

Looks okay at my end.

Do you have something in your common.js or global.js that's possibly causing this?
You can try by appending ?safemode=1 at the end of the URL to view it without external JS interfering with the extension code. So try this link.

Do you have something in your common.js or global.js that's possibly causing this?

I don't think user scripts or CSS are executed on Special:Preferences or GlobalPreferences

In T190355#4071352, @MusikAnimal wrote:

I don't think user scripts or CSS are executed on Special:Preferences or GlobalPreferences

Oh, you're probably right. Hmm. Not sure what's happening then.

@MichaelSchoenitzer Where are you seeing this? Which wiki?

I'm seeing it on mediawiki.org with my Workaccount "User:Michael Schönitzer (WMDE)". Accurs also with ?safemode=1.

Checked again: It happens also with a completely blank user-account (no settings or anything). Happens only with Chromium not with Firefox. Using Chromium version 65

I think this is another example of the vagaries of form element rendering on different systems. If the height of the globalprefs checkbox is more than the height of its preference field, the staggering will occur. The trouble is that the heights of those things are not always calculated by the browser in the same way.

I think the fix is to put a min-height on the form field, probably 1.5em. Or a height on the globalprefs checkbox and a matching slightly larger min-height on the field.

Samwilson seems right. If I zoom in or out (Ctr-+ / Ctr--) it works. On 80% it's broken again.

If there's a simple fix we should take this into our next sprint.

Not a release blocker.

Change 446381 had a related patch set uploaded (by Bartosz Dziewoński; owner: Bartosz Dziewoński):
[mediawiki/extensions/GlobalPreferences@master] Prevent "staggered" checkbox fields at some font sizes / zoom levels

https://gerrit.wikimedia.org/r/446381

Change 446381 merged by jenkins-bot:
[mediawiki/extensions/GlobalPreferences@master] Prevent "staggered" checkbox fields at some font sizes / zoom levels

https://gerrit.wikimedia.org/r/446381