Blink: Intent to Ship: CSS 'ic' Length Unit groups.google.com/a/chromium…
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I'm wondering why csswg didn't choose a more simpler glyph like 一 or 口? @davidbaron
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I think the group really intended to use 永, which is apparently has a history as a sort of reference character, but chose 水 by mistake instead, and then decided the mistake wasn't worth fixing, since any Chinese or Japanese font should have either.

Aug 5, 2022 · 1:48 AM UTC

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I chose 水 because any font that has even a trivial amount of CJK will have it since it's such a basic character, and it fills the square so it'll work even in a weirdly proportional font. @heycam later filed an issue on 永 but it wasn't clear if it was worth changing.
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