[shpx]

One thing this article doesn’t mention is that the two font file formats used on the web (TTF/OTF and WOFF) can’t contain more than 65,536 glyphs. Which I suspect is the main reason the Noto font caps out at ~64,000 characters on that bar chart of how many characters are in some fonts.

https://www.w3.org/TR/2018/REC-WOFF2-20180301/#DataTypes

[thayne]

And not only is that not enough for all of Unicode, but you actually hit the limit much sooner, because that is the number of glyphs, and a good font has more glyphs than characters, due to things like ligatures.

[cooper12]

CJK fonts also commonly max this out as well.