[css-inline-3] Clarify alignment values

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
38/100
Issue type
Documentation
Clarity
Mostly clear
Activity status
Stale
Tech stack
css
Domain
documentation

Research direction

Start with the CSS Inline Level 3 alignment-value definitions referenced by the issue. Compare the descriptions of Latin/ascent-descent em boxes, ideographic em boxes, and ideographic top and bottom, then clarify which font metrics each uses and how they relate to text-top and text-bottom. Done means the distinctions are explicit in the draft.

Written by the indexing model from the issue text.

Description

css-inline-3

The alignment values have very vague descriptions that need to be tightened up.

In particular, we need to distinguish Latin (ascent/descent)-based em box used in CSS from ideographic em box (which seem to be related to how text-top and text-bottom work) vs. ideographic top and bottom, and be clear about what font metrics are used for each.

Dominant language
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Avg merge
2d 18h
Merged PRs (30d)
24

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