text-spacing-trim-give-up

Author: kojiishi

css-text-4/Overview.bs

@@ -8337,6 +8337,13 @@ 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 not 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,
+
 	Unless 'text-spacing-trim' is set to ''space-all''
 	(or the font has proportional fullwidth punctuation glyphs),
 	the UA must collapse the space typically associated with such full width glyphs