On Monday, March 15, 2021 at 1:39:36 PM UTC+1, Jonathan Kew wrote: > Summary: For a given "font size" as expressed e.g. in CSS px or points, > different fonts can vary significantly in how visually large they look. > The nominal "font size" does not necessarily relate to any specific > dimension of the glyphs; it sizes the coordinate space within which the > glyph shapes are drawn, but different designs may fill that space in > very different ways. > > The proposed glyph-scale-factor descriptor (name to be bikeshedded) will > allow authors to adjust the scaling of individual fonts loaded using > @font-face, to better harmonize the visual sizes of different designs, > or to more closely match a fallback face to a resource that may be > swapped in later, thereby minimizing visual layout shift when the final > font becomes available. > > Unlike modifying the font-size property, this will scale the glyphs (and > metrics) of the font but will *not* affect things like the CSS 'em' > unit. It affects how glyphs scale within the font's em square, not the > size of the em square itself. > > Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1698495 > > Standard: This is currently under discussion for CSS Fonts 5; details > still to be worked out. See https://github.com/w3c/csswg-drafts/issues/6075. > > Platform coverage: All > > Preference: layout.css.glyph-scale-factor.enabled > > DevTools bug: None needed. (More generally, it would be awesome to have > a @font-face rule inspector in DevTools -- distinct from the existing > font *properties* inspector; such an inspector would expose this along > with the other @font-face descriptors. But that's not specific to this > new descriptor.) > > Other browsers: > Blink: Considering (already experimented with possible implementation, > see https://github.com/w3c/csswg-drafts/issues/5533#issuecomment-714166725). > Webkit: Present in CSS WG discussions but no clear signals yet AFAIK. > > web-platform-tests: To be added to web-platform/tests/css/css-fonts (as > .tentative initially, until spec is finalized).
If I'm not mistaken, the CSS WG ended up naming the descriptor 'size-adjust'. See https://github.com/w3c/csswg-drafts/pull/6108. Sebastian _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
