[MPEG-OTSPEC] Requesting progress update on COLRv1 in fontTools, FreeType, etc.

[William_J_G Overington]

Suppose please that a font is made with COLRv1 glyphs and is published, 
and someone tries to use it in an application that handles COLRv0 glyphs 
but not COLRv1 glyphs.

What would be displayed if the COLRv1 glyph has shading in it?

A COLRv0 glyph in a present system can be designed to include a 
monochrome fallback.

Can a COLRv1 glyph have a separate COLRv0 glyph accompanying it in some 
way so as to give a graceful fallback, or does the COLRv1 glyph 
implicitly have a fallback as part of its structure?

William Overington

Friday 15 January 2021