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

From: quasicomputational via GitHub <sysbot+gh@w3.org>
Date: Fri, 09 Oct 2020 11:29:57 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-706127547-1602242996-sysbot+gh@w3.org>
> 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"?

Yeah - this is only really a concern in privacy-sensitive contexts. Never downloading webfonts is another fine option; mentioning both options with upsides and downsides seems like a good idea to me, so that UAs can weigh the trade-off on the basis that they'll have the best idea about what's acceptable and what's unacceptable.

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