Comment 3 for bug 434054

For the record, anyway, ttf-tahoma-replacement provides only limited set of glyphs. It won't serve Thai people.

Removing the rule will result in fontconfig implicit fallback for missing glyphs when rendering Thai pages, which can end up with any font, depending on what is installed. Fortunately, it's Waree for my system. But for others, I don't know.

But it's not that serious. Waree itself is not the exact replacement anyway. So, I'm OK with the fallback removal.

But please keep other synthesizing rules in the file intact. They are still useful for Thai people.