[css-cascade-4] An "all-namespaces" user agent stylesheet

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
25/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
css
Domain
documentation, web-dev

Research direction

Compare the HTML, SVG, and MathML user agent style sheet sections with the CSS View Transitions UA styles and the possible ::selection case. Start by tracing how these specifications define and order their styles. Done should be a resolved proposal for a central all-namespaces stylesheet and its cross-specification ordering.

Written by the indexing model from the issue text.

Description

css-cascade-4

Right now we have:

But some styles should span all three, for example view transition pseudo-element styles, but perhaps also things like ::selection.

It feels like we need a central "all-namespaces user agent stylesheet". Other specs could define a set of styles, and the central "all-namespaces user agent stylesheet" spec would include them (this would also define the ordering of styles from different specs).

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Avg merge
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Merged PRs (30d)
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