- From: Koji Ishii via GitHub <sysbot+gh@w3.org>
- Date: Thu, 18 Jan 2024 09:43:04 +0000
- To: public-css-archive@w3.org
@xfq Thanks for the info. I haven't checked with JLREQ folks, but I don't think this is language dependent. If the text is "永永永12%永永永" then I believe Japanese expects spacing after "%" too.
The complexity of handling punctuation and symbols is that it depends on the context. Imagine "永永永12%永永永" and "永永永X%永永永" with the CSS `text-autospace: ideograph-numeric`. Ideally, I hope you agree, we want the spacing after "%" for the first case but not for the second. Doing this requires more context than adjacent two characters, and this could be longer, such as "永永永mininum-maximum%永永永". They could also appear alone, such as when "how many % is this?" ("何%ですか?" in Japanese). Supporting longer context slows down the layout engine severely.
It should be a bit simpler if CSS doesn't distinguish `ideograph-numeric` and `ideograph-alpha`, but even if we unite them, there are always edge cases, similar to the UAX#9 Bidi Algorithm isn't always perfect.
The discussion should move to Unicode once the proposal is accepted, and I hope we can find a good balance of desired results, complexity, and performance there.
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