[css-fonts-4] font-kerning:normal and CJK fonts with kerning pairs for fullwidth not well defined #6723
Description
Normal kerning for CJK fonts that support the ‘kern’ feature should only apply the feature on proportional glyphs. By default this means excluding the fullwidth CJK glyphs and only kerning the proportional Latin glyphs.
If kerning the CJK fullwidth glyphs you must also apply ‘palt’ (‘vpal’ in vertical) or the kerning amounts will be incorrect.
5FB1
This kerning should be optional and not the default.