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[css-viewport] [cssom-view-1] Add a definition of the zoom CSS property #9699

Merged
merged 34 commits into from
Jan 30, 2024
Merged

[css-viewport] [cssom-view-1] Add a definition of the zoom CSS property #9699

merged 34 commits into from
Jan 30, 2024

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chrishtr
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@chrishtr chrishtr commented Dec 12, 2023 •
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This PR resolves #9644, #9442, #9398 and #9397.

In particular, it defines zoom visual semantics as follows:

  • A non-negative number that applies to elements and descendants. Nested zooms multiply. (The "effective zoom" is the product of the zooms of all ancestors.)
  • Non-auto and non-percentage CSS lengths, including inherited lengths, are multiplied by effective zoom.
  • Replaced elements' intrinsic sizes are resized according to effective zoom.
  • Nested iframes are resized by the effective zoom of their containing <iframe> element

CSSOM:

  • getBoundingClientRect, getClientRects and IntersectionOserver return rects that include zoom
  • All other CSSOM APIs return values that do not include zoom
  • offsetParent has a new quirk (stopping at ancestors with non-default zoom) that is analogous to what CSS transform does
  • offsetTop excludes zoom of self, just like CSS transform
  • devicePixelRatio is affected by zoom inherited from an ancestor frame

Web compat analysis: the above is what is already implemented in WebKit and Chromium browsers, except:

  • getBoundingClientRect, getClientRects and IntersectionOserver are unzoomed
  • Inherited properties other than font-size are unaffected
  • Nested frames are not zoomed

Blink plans to make the above 3 compat-affecting changes soon, and I expect them to be web compatible.

A working design doc is here.

MrHBS
MrHBS reviewed Dec 13, 2023
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@chrishtr chrishtr changed the title [css-viewport] Add a definition of the zoom CSS property [css-viewport] [cssom-view-1] Add a definition of the zoom CSS property Dec 21, 2023
fantasai
fantasai reviewed Dec 21, 2023
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Quick pass on markup.

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chrishtr commented Jan 4, 2024

Quick pass on markup.

Thanks!

@chrishtr chrishtr requested a review from emilio January 4, 2024 20:05
zcorpan
zcorpan reviewed Jan 10, 2024
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emilio
emilio requested changes Jan 17, 2024
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zcorpan
zcorpan reviewed Jan 18, 2024
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@chrishtr @zcorpan
Fix typo
1f6d09a 
Co-authored-by: Simon Pieters <zcorpan@gmail.com>
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@emilio how close is this to being merged? If it can get merged by Tues 23 I can include it in the Thurs 25 FPWD.

lilles
lilles reviewed Jan 19, 2024
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emilio
emilio approved these changes Jan 30, 2024
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Looks good, thanks!

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chrishtr
chrishtr commented Jan 30, 2024
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@chrishtr chrishtr merged commit 94cfc4c into w3c:main Jan 30, 2024
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@wpt-interop wpt-interop mentioned this pull request Feb 1, 2024
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@sophiebits sophiebits mentioned this pull request Mar 29, 2024
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sophiebits added a commit to facebook/react that referenced this pull request Mar 29, 2024
@sophiebits
Revert "Remove zoom from special cases list" (#28673)
19c7c29 
Reverts #26631

This got specced: w3c/csswg-drafts#9699

I left msZoom because it seems plausible someone will still be using it
for backwards compat.
github-actions bot pushed a commit to facebook/react that referenced this pull request Mar 29, 2024
@sophiebits
Revert "Remove zoom from special cases list" (#28673)
aa4213f 
Reverts #26631

This got specced: w3c/csswg-drafts#9699

I left msZoom because it seems plausible someone will still be using it
for backwards compat.

DiffTrain build for [19c7c29](19c7c29)
EdisonVan pushed a commit to EdisonVan/react that referenced this pull request Apr 15, 2024
@sophiebits @AndyPengc12
Revert "Remove zoom from special cases list" (facebook#28673)
2774689 
Reverts facebook#26631

This got specced: w3c/csswg-drafts#9699

I left msZoom because it seems plausible someone will still be using it
for backwards compat.
@szager-chromium szager-chromium mentioned this pull request Oct 8, 2024
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@pavanmajji03 pavanmajji03 mentioned this pull request Nov 4, 2024
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[css-viewport] [css-zoom] Should zoom affect iframes?
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@chrishtr @svgeesus @zcorpan @tabatkins @fantasai @lilles @emilio @jfkthame @MrHBS