Background
Unlike OOUIHTMLForm we don't have max-width on our new Codex components, which is a weird user-facing presentation.
We should add max-width to components, or even the whole codex-htmlform selector.
In Codex we currently have put out a recommendation of “maximum width of size-3200 (equivalent to 512px in the default Codex theme)”
Open question
For the whole form, should we go for size-3200 as well as max-width, or should we consider the widest size-5600 instead?
@DTorsani-WMF came up with a comparison in T362270 and we've decided to go with a new size-4000.
Acceptance criteria
- Set max-width on
eitherCodexHTMLFormin special.less or on Special:Block specific stylesheet