TonyM wrote: > This article lists glyphs supported by an intersection of a set of fonts > <https://www.johndcook.com/blog/2013/04/11/which-unicode-characters-can-you-depend-on/>. > > Perhaps we could take this list and present it in a tiddler, in a large > font size and put it out to the user forum for people to test and report if > all the glyphs are visible. Perhaps also in an empty.html at a URL people > can just open an review on their various devices?
The problem with that "intersection" (nice idea) is it does NOT really work to illuminate what is going on. All that entering those glyphs would show is that somewhere in the "global font hierarchy" a character in a font (a character in some registered font somewhere) those glyphs exist. It is unfortunate that there is little explicitness in most documentation that CHARACTER substitution is ADDITIVE to FONT CASCADE. In CSS cascade you can MATCH on font but FAIL on CHARACTER. At that point another method of substitution arises that, as far as I can see, CSS doesn't fully control. The substitution "pretends" that the glyph exists in a font when actually it doesn't. It is an invisible process. In reality, the "full substitution-stack", roughly speaking is: (1) CSS Font Cascade > (2) Browser Cascade/Stack > (3) OS Font Stack. Not all OS, or browsers, handle this substitution logic the same way. FYI (OS) Substitution rules read header data in Fonts to determine match to the nearest consanguineous font character in another similar looking font first. Etc. etc This is a short way of saying: *What that would show is Machine Support, Not Specific CSS font support. * *That is good!* But it isn't really providing the full clarity needed to pin down UNambigous reliability for markup glyphs. Best wishes TT -- You received this message because you are subscribed to the Google Groups "TiddlyWikiDev" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywikidev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywikidev/096d1912-4f8b-48f5-95dd-256303725231n%40googlegroups.com.
