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[css-text-4] Clarify fonts without enough blank may not be trimmed #9225

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Merged
merged 4 commits into from
Oct 30, 2023
Merged

[css-text-4] Clarify fonts without enough blank may not be trimmed #9225

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a7c08a8
text-spacing-trim-give-up
kojiishi Aug 23, 2023
358879d
frivoal review
kojiishi Oct 23, 2023
75b3afc
Fix typo.
kojiishi Oct 23, 2023
ef7bb37
Merge branch 'main' into text-spacing-trim-give-up
kojiishi Oct 24, 2023
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7 changes: 7 additions & 0 deletions css-text-4/Overview.bs
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Expand Up @@ -10625,6 +10625,13 @@ Fullwidth Punctuation Collapsing</h4>
the font has proportional ideographs
and the fullwidth advance width cannot be reliably determined by measuring glyphs.

Some fonts have fullwidth punctuation characters
whose blank are too small to trim (kern.)
UA may choose not to trim (kern)
when the UA determined the trimming (kerning) may cause
glyph cut-offs, collisions, or excessive kerning
through glyph bounding box, glyph metrics, or font features.

If 'text-spacing-trim' is ''trim-all'',
the UA must collapse the space typically associated with such full width glyphs
regardless of the context in which they appear.
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