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emilio opened this issue May 19, 2020 · 8 comments
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[css-values-4] Consider changing the specified behavior of <ratio>: 0 / 0 #5084

emilio opened this issue May 19, 2020 · 8 comments
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Closed Accepted by Editor Discretion Commenter Satisfied Commenter has indicated satisfaction with the resolution / edits. css-values-4 Current Work

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@emilio
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emilio commented May 19, 2020

https://drafts.csswg.org/css-values-4/#ratios says:

The computed value of a is the pair of numbers provided, unless both numbers are zero, in which case the computed value is the pair (1, 0) (same as 1 / 0).

Is there a strong reason this is a computed value change rather than just a "behaves as"?

There isn't really a problem with this, but it feels odd to make it serialize to something else for no good reason, and it seems weird to serialize to 0 / 0 in specified values and 1 / 0 in computed values.
@emilio emilio added the css-values-4 Current Work label May 19, 2020
@Loirooriol
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I guess this can affect interpolations from/to 0 / 0depending on #4953

@tabatkins
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I don't think that's important, since 0 / 0 is an error case anyway. ^_^

But yeah, I think we were just imprecise in wording there. Should be fine to just make it behave as 1/0, but continue to compute to 0/0, if that's easier/better in the implementation.

@cbiesinger
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So, in the wpt/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html test, it expects that the serialized value of 0/0 is 1/0. The spec only says the computed value should be 1/0. Is the test correct?

@tabatkins
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It depends on which value is being serialized. The test is incorrect, since it's serializing the specified value; that should still be 0 / 0.

chromium-wpt-export-bot pushed a commit to web-platform-tests/wpt that referenced this issue Sep 30, 2020
@cbiesinger @chromium-wpt-export-bot
[AspectRatio] Fix incorrect test
1203699 
As per w3c/csswg-drafts#5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
Merged
pull bot pushed a commit to Alan-love/chromium that referenced this issue Oct 1, 2020
@cbiesinger
[AspectRatio] Update the parsing of aspect-ratio
ff0aadc 
There have been a number of spec changes in parsing aspect-ratio:
https://drafts.csswg.org/css-sizing-4/#aspect-ratio
https://drafts.csswg.org/css-values-4/#ratio-value

In particular:
- "auto <ratio>" is now a supported syntax, where the ratio is only used as
  a fallback if there is no intrinsic ratio
- The ratio is now a non-negative number instead of a positive integer
- The second component of the ratio is optional

Note that I believe the last test in contain-intrinsic-size-valid to be
incorrect; by my reading only the computed value should be affected,
not the serialization.

Note open issues:
w3c/csswg-drafts#5557
w3c/csswg-drafts#5084

R=futhark@chromium.org, ikilpatrick@chromium.org, mstensho@chromium.org

Bug: 1045668, 1083010, 1086606
Change-Id: Iba3588ed98beacd02f77f3bcc19e387b3add4a5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437698
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812403}
chromium-wpt-export-bot pushed a commit to web-platform-tests/wpt that referenced this issue Oct 1, 2020
@cbiesinger @chromium-wpt-export-bot
[AspectRatio] Fix incorrect test
7f7e8a4 
As per w3c/csswg-drafts#5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
chromium-wpt-export-bot pushed a commit to web-platform-tests/wpt that referenced this issue Oct 1, 2020
@cbiesinger @chromium-wpt-export-bot
[AspectRatio] Fix incorrect test
8f34ede 
As per w3c/csswg-drafts#5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439647
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812646}
chromium-wpt-export-bot pushed a commit to web-platform-tests/wpt that referenced this issue Oct 1, 2020
@cbiesinger @chromium-wpt-export-bot
[AspectRatio] Fix incorrect test
ec58818 
As per w3c/csswg-drafts#5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439647
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812646}
blueboxd pushed a commit to blueboxd/chromium-legacy that referenced this issue Oct 1, 2020
@cbiesinger
[AspectRatio] Fix incorrect test
556b5b3 
As per w3c/csswg-drafts#5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439647
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812646}
@tabatkins
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I've fixed the test, btw.

@cbiesinger
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I thought I fixed the test :p

@tabatkins
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lol, i think i didn't merge the PR for mine

ziransun pushed a commit to ziransun/wpt that referenced this issue Oct 6, 2020
@cbiesinger @ziransun
[AspectRatio] Fix incorrect test
dee06b3 
As per w3c/csswg-drafts#5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439647
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812646}
moz-v2v-gh pushed a commit to mozilla/gecko-dev that referenced this issue Oct 8, 2020
@cbiesinger @moz-wptsync-bot
Bug 1668272 [wpt PR 25887] - [AspectRatio] Fix incorrect test, a=test…
700ebd8 
…only

Automatic update from web-platform-tests
[AspectRatio] Fix incorrect test

As per w3c/csswg-drafts#5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439647
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812646}

--

wpt-commits: ec588187413435ae7e248a5d2a07846792e44bec
wpt-pr: 25887
tabatkins added a commit that referenced this issue Oct 8, 2020
@tabatkins
[css-values-4] Define 0/0 as just *behaving as* 1/0, not computing to. …
2cded55 
…#5084
@tabatkins
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All right, I changed the spec to just make 0/0 behave as 1/0, rather than computing to it. This means that a 0/0 ratio will serialize as 0/0 in all value stages.

@tabatkins tabatkins added Closed Accepted by Editor Discretion Commenter Satisfied Commenter has indicated satisfaction with the resolution / edits. labels Oct 8, 2020
moz-v2v-gh pushed a commit to mozilla/gecko-dev that referenced this issue Oct 13, 2020
@BorisChiou
Bug 1669232 - Serialize a 0/0 ratio as 0/0 in all value stages. r=emilio
1882647 
Based on the update of github.com/w3c/csswg-drafts/issues/5084,
a 0/0 ratio will serialize as 0/0 in all value stages.

Differential Revision: https://phabricator.services.mozilla.com/D93182
sidvishnoi pushed a commit to sidvishnoi/gecko-webmonetization that referenced this issue Oct 13, 2020
@cbiesinger @moz-wptsync-bot
Bug 1668272 [wpt PR 25887] - [AspectRatio] Fix incorrect test, a=test…
e2ec43b 
…only

Automatic update from web-platform-tests
[AspectRatio] Fix incorrect test

As per w3c/csswg-drafts#5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439647
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812646}

--

wpt-commits: ec588187413435ae7e248a5d2a07846792e44bec
wpt-pr: 25887
sidvishnoi pushed a commit to sidvishnoi/gecko-webmonetization that referenced this issue Oct 13, 2020
@BorisChiou
Bug 1669232 - Serialize a 0/0 ratio as 0/0 in all value stages. r=emilio
26a5413 
Based on the update of github.com/w3c/csswg-drafts/issues/5084,
a 0/0 ratio will serialize as 0/0 in all value stages.

Differential Revision: https://phabricator.services.mozilla.com/D93182
chromium-wpt-export-bot pushed a commit to web-platform-tests/wpt that referenced this issue Oct 16, 2020
@cbiesinger @chromium-wpt-export-bot
[AspectRatio] Fix serialization of aspect-ratio
90d9bec 
Per these conversations:
w3c/csswg-drafts#5084
w3c/csswg-drafts#5561

R=futhark@chromium.org, xiaochengh@chromium.org

Bug: 1045668
Change-Id: I066809e31e4120b0c179235a101db5c74c3dd146
Merged
chromium-wpt-export-bot pushed a commit to web-platform-tests/wpt that referenced this issue Oct 17, 2020
@cbiesinger @chromium-wpt-export-bot
[AspectRatio] Fix serialization of aspect-ratio
55549d9 
Per these conversations:
w3c/csswg-drafts#5084
w3c/csswg-drafts#5561

R=futhark@chromium.org, xiaochengh@chromium.org

Bug: 1045668
Change-Id: I066809e31e4120b0c179235a101db5c74c3dd146
chromium-wpt-export-bot pushed a commit to web-platform-tests/wpt that referenced this issue Oct 17, 2020
@cbiesinger @chromium-wpt-export-bot
[AspectRatio] Fix serialization of aspect-ratio
bf946e6 
Per these conversations:
w3c/csswg-drafts#5084
w3c/csswg-drafts#5561

R=futhark@chromium.org, xiaochengh@chromium.org

Bug: 1045668
Change-Id: I066809e31e4120b0c179235a101db5c74c3dd146
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480064
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818250}
chromium-wpt-export-bot pushed a commit to web-platform-tests/wpt that referenced this issue Oct 17, 2020
@cbiesinger @chromium-wpt-export-bot
[AspectRatio] Fix serialization of aspect-ratio
8b94afc 
Per these conversations:
w3c/csswg-drafts#5084
w3c/csswg-drafts#5561

R=futhark@chromium.org, xiaochengh@chromium.org

Bug: 1045668
Change-Id: I066809e31e4120b0c179235a101db5c74c3dd146
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480064
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818250}
pull bot pushed a commit to Mu-L/chromium that referenced this issue Oct 17, 2020
@cbiesinger
[AspectRatio] Fix serialization of aspect-ratio
1071556 
Per these conversations:
w3c/csswg-drafts#5084
w3c/csswg-drafts#5561

R=futhark@chromium.org, xiaochengh@chromium.org

Bug: 1045668
Change-Id: I066809e31e4120b0c179235a101db5c74c3dd146
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480064
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818250}
moz-v2v-gh pushed a commit to mozilla/gecko-dev that referenced this issue Oct 27, 2020
@moz-wptsync-bot
Bug 1672025 [wpt PR 26148] - [AspectRatio] Fix serialization of aspec…
fbb25a1 
…t-ratio, a=testonly

Automatic update from web-platform-tests
[AspectRatio] Fix serialization of aspect-ratio

Per these conversations:
w3c/csswg-drafts#5084
w3c/csswg-drafts#5561

R=futhark@chromium.org, xiaochengh@chromium.org

Bug: 1045668
Change-Id: I066809e31e4120b0c179235a101db5c74c3dd146
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480064
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818250}

--

wpt-commits: 8b94afceafbd71defd6e3a1f056321b7788e18c3
wpt-pr: 26148
sidvishnoi pushed a commit to sidvishnoi/gecko-webmonetization that referenced this issue Oct 27, 2020
@moz-wptsync-bot
Bug 1672025 [wpt PR 26148] - [AspectRatio] Fix serialization of aspec…
6979cb8 
…t-ratio, a=testonly

Automatic update from web-platform-tests
[AspectRatio] Fix serialization of aspect-ratio

Per these conversations:
w3c/csswg-drafts#5084
w3c/csswg-drafts#5561

R=futhark@chromium.org, xiaochengh@chromium.org

Bug: 1045668
Change-Id: I066809e31e4120b0c179235a101db5c74c3dd146
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480064
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818250}

--

wpt-commits: 8b94afceafbd71defd6e3a1f056321b7788e18c3
wpt-pr: 26148
emilio pushed a commit to servo/servo that referenced this issue Feb 26, 2021
@BorisChiou @emilio
style: Serialize a 0/0 ratio as 0/0 in all value stages.
61685ca 
Based on the update of github.com/w3c/csswg-drafts/issues/5084,
a 0/0 ratio will serialize as 0/0 in all value stages.

Differential Revision: https://phabricator.services.mozilla.com/D93182
bhearsum pushed a commit to mozilla-releng/staging-firefox that referenced this issue May 1, 2025
@cbiesinger @moz-wptsync-bot
Bug 1668272 [wpt PR 25887] - [AspectRatio] Fix incorrect test, a=test…
ff0f62a 
…only

Automatic update from web-platform-tests
[AspectRatio] Fix incorrect test

As per w3c/csswg-drafts#5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439647
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812646}

--

wpt-commits: ec588187413435ae7e248a5d2a07846792e44bec
wpt-pr: 25887
bhearsum pushed a commit to mozilla-releng/staging-firefox that referenced this issue May 1, 2025
@BorisChiou
Bug 1669232 - Serialize a 0/0 ratio as 0/0 in all value stages. r=emilio
8c77c02 
Based on the update of github.com/w3c/csswg-drafts/issues/5084,
a 0/0 ratio will serialize as 0/0 in all value stages.

Differential Revision: https://phabricator.services.mozilla.com/D93182
bhearsum pushed a commit to mozilla-releng/staging-firefox that referenced this issue May 1, 2025
@moz-wptsync-bot
Bug 1672025 [wpt PR 26148] - [AspectRatio] Fix serialization of aspec…
ae12695 
…t-ratio, a=testonly

Automatic update from web-platform-tests
[AspectRatio] Fix serialization of aspect-ratio

Per these conversations:
w3c/csswg-drafts#5084
w3c/csswg-drafts#5561

R=futhark@chromium.org, xiaochengh@chromium.org

Bug: 1045668
Change-Id: I066809e31e4120b0c179235a101db5c74c3dd146
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480064
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818250}

--

wpt-commits: 8b94afceafbd71defd6e3a1f056321b7788e18c3
wpt-pr: 26148
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@tabatkins @emilio @cbiesinger @Loirooriol