IsCJKIdeographOrSymbol() recognizes the "obvious" CJK ideograph blocks, but also returns true for a rather arbitrary-looking (and large) collection of symbols, many of which have no strong connection with CJK; see codepoints listed in kIsCJKIdeographOrSymbolArray at https://chromium.googlesource.com/chromium/src.git/+/9f802345bd20185c79cbec975e0d19a4bf813411/third_party/WebKit/Source/platform/text/CharacterPropertyDataGenerator.h. (Why are dagger '†' and double-dagger '‡' in the IsCJKIdeographOrSymbol list? They're widely used in English text, e.g. as footnote markers; why wouldn't skip-ink want to ski them? Why is per-mille sign '‰' there, yet not percent '%' or per-tenthousand '‱'? Etc.) Indeed, trying an example like data:text/html;charset=utf-8,<h1><u>Does ink skip dagger '%E2%80%A0' and double-dagger '%E2%80%A1'? I see that in Safari, the underline does skip the daggers (as I'd expect), while in Chrome it doesn't. I don't think Blink's arbitrary list of symbols here makes much sense.
Bug 1573249 Comment 4 Edit History
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IsCJKIdeographOrSymbol() recognizes the "obvious" CJK ideograph blocks, but also returns true for a rather arbitrary-looking (and large) collection of symbols, many of which have no strong connection with CJK; see codepoints listed in kIsCJKIdeographOrSymbolArray at https://chromium.googlesource.com/chromium/src.git/+/9f802345bd20185c79cbec975e0d19a4bf813411/third_party/WebKit/Source/platform/text/CharacterPropertyDataGenerator.h. (Why are dagger '†' and double-dagger '‡' in the IsCJKIdeographOrSymbol list? They're widely used in English text, e.g. as footnote markers; why wouldn't skip-ink want to ski them? Why is per-mille sign '‰' there, yet not percent '%' or per-tenthousand '‱'? Etc.) Indeed, trying an example like data:text/html;charset=utf-8,<h1><u>Does ink skip dagger '%E2%80%A0' and double-dagger '%E2%80%A1' I see that in Safari, the underline does skip the daggers (as I'd expect), while in Chrome it doesn't. I don't think Blink's arbitrary list of symbols here makes much sense.
IsCJKIdeographOrSymbol() recognizes the "obvious" CJK ideograph blocks, but also returns true for a rather arbitrary-looking (and large) collection of symbols, many of which have no strong connection with CJK; see codepoints listed in kIsCJKIdeographOrSymbolArray at https://chromium.googlesource.com/chromium/src.git/+/9f802345bd20185c79cbec975e0d19a4bf813411/third_party/WebKit/Source/platform/text/CharacterPropertyDataGenerator.h. (Why are dagger '†' and double-dagger '‡' in the IsCJKIdeographOrSymbol list? They're widely used in English text, e.g. as footnote markers; why wouldn't skip-ink want to ski them? Why is per-mille sign '‰' there, yet not percent '%' or per-tenthousand '‱'? Etc.) Indeed, trying an example like data:text/html;charset=utf-8,<h1><u>Does ink skip dagger '%E2%80%A0' and double-dagger '%E2%80%A1' or not I see that in Safari, the underline does skip the daggers (as I'd expect), while in Chrome it doesn't. I don't think Blink's arbitrary list of symbols here makes much sense.