Allow use of modern CSS in templates by updating the TemplateStyles CSS sanitizer (Community Wishlist/W350)
Many modern formatting and styling (CSS) techniques are not allowed by TemplateStyles, including
- modern units such as
lh, which would allow our wiki templates to adapt to different line height values used by different skins - certain invocations of
var(), a crucial function for adapting templates to dark mode width: fit-content, which removes the need to force templates to have a pre-set fixed width or span the entire width of the page- media queries that appear in MediaWiki CSS, such as
@supports ( mask-image: none; ), which are needed if we want to override certain core CSS styles (e.g. CategoryTree)
This is a great source of frustration for template creators and maintainers, and leads to either (a) the creation of hacky workarounds which will no doubt break on some devices and/or when skins change, or (b) resorting to placing styles in MediaWiki:Common.css, increasing page sizes and adding to maintenance burden.
The CSS sanitiser needs to be regularly kept up to date.
Also, to avoid wasting time, we need to see sanitiser warnings on preview, not only on save.
Unassigned
Template editors and maintainers, (indirectly) interface admins - and ultimately the readers who benefit from modern, accessible, adaptive styling
- Created: 11:30, 9 January 2025
- Last updated: 17:34, 5 March 2026
- Author: This, that and the other (talk)
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