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Re: [csswg-drafts] [css-fonts] JS-free probing of Unicode support of fonts (#5578)

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Mon, 05 Oct 2020 07:57:56 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-703468365-1601884675-sysbot+gh@w3.org>
Thanks for that, and especially for the sample code. I agree that probing via `unicode-range` is possible and will amend the text in line with your first suggestion.

The second suggestion, to always download all fonts, would be prohibitively expensive in most cases. Fonts for Chinese, Japanese or Korean can be **huge**, so requiring browsers to always download them (and re-download them again, every time) would be a very costly mitigation. But I suspect you mean this only for especially privacy-sensitive situations, right? In that case, wouldn't "never download fonts" be a better mitigation"?

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