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Re: [csswg-drafts] [css-fonts] font-size Descriptor for ex Unit (#731)

From: Christoph Päper via GitHub <sysbot+gh@w3.org>
Date: Fri, 20 Aug 2021 15:49:15 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-902787815-1629474554-sysbot+gh@w3.org>

Above, I proposed to specify, in a descriptor, a fallback ratio for `ex` as a percentage of `em` if the actual _first available font_ value is not available. The newly extended `font-size-adjust` property value syntax still requires the actual value to be available when `<number>` is used and, of course, also when `from-font` is used instead. 

In conclusion, I agree that this looks very similar, but could actually work in combination: the descriptor would provide a fallback value for _m′_, while the property specifies _m_. 

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