I'm developing a new version of a typeface which has a wide Latin character support in both ways:
legacy registered codepoints (like: U+00E0=à)
opentype mark to combine marks and base letters (like: U+0061=a and U+0300=gravecomb)
I started to test both ways inside browsers and apps, and realized that mark and base letters fallback to legacy codepoints! The font has no problem but I don't know if all things is correct in my tests or not, I'm looking for a CSS property or browser flag to disable the fallback. Have you ever face this problem? What is your solution?