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Re: [csswg-drafts] [css-fonts] limit local fonts to those selected by users in browser settings (or other browser chrome) (#4497)

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Tue, 03 Mar 2020 14:04:14 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-593966640-1583244253-sysbot+gh@w3.org>
@r12a wrote

> If i understand correctly, the problem arises because people serving web pages are able to inspect which fonts are available on a users system.

Not directly, and not in so flagrant a way as was possible with Flash (which returned a complete list of all installed fonts, with a single function call). Instead there needs to be text (possibly hidden) styled with a specific font name, and that text is tested to see if the font loaded. In other words, each possible font is tested, one by one, and each test introduces some small delay to overall page rendering. So in practice, privacy testers such as the EFF one test a couple of hundred common fonts.

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Received on Tuesday, 3 March 2020 14:04:16 UTC

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