[css-inline] text-box-edge: ideographic and ideographic-ink should use ideographic fonts in the cascade list #10928
Description
Many CJK sites use Latin fonts as the first available fonts, to use the Latin fonts for Latin characters. For example:
font-family: Arial, CJK-font, sans-serif;Authors want to align text very accurately when applying ideographic or ideographic-ink for the text-box-edge property. In this case, using the metrics from Arial doesn't help, but we don't have a mechanism to use metrics from the CJK-font.
Can we define, at least for text-box-edge: ideographic*, it should use the "first available ideographic font", instead of "first available font"? How to define the "first available ideographic font" isn't technically a simple work though.
(I mentioned this in #10850 but splitting as it's has enough complexity to discuss separately)
@fantasai @nt1m @vitorroriz @Clqsin45 @bfgeek @jfkthame @kidayasuo @xfq