Hey Rune,
On 10/20/23 9:30 AM, Rune Lillesveen wrote:
Contact emails
futh...@chromium.org, andr...@chromium.org
Explainer
None
Specification
https://drafts.css-houdini.org/css-properties-values-api-1/#syntax-strings
Summary
Supports using the <transform-function> and <transform-list> syntaxes
for custom properties registered with @property or registerProperty().
The syntax can be used to restrict values of the custom property to
represent transforms. This also makes it possible to use transitions
and animations directly on these registered custom properties.
<transform-list> and <transform-function> can have computed values
that contain both pixel and percentage values. They are interpolated
as pixels and percentages respectively. However, if transforms cannot
be interpolated on a function by function basis because the function
types do not match, they need to be interpolated by matrices which
cannot represent percentage values. For instance when interpolating
between a translate and a rotate with a percentage component in the
translate function.
For those cases a mix() function is necessary to represent
intermediate values. Chrome does not yet implement a mix() function.
Instead we fall back to discrete interpolations to avoid
non-representable computed values. This is only a problem for the
standard 'transform' property in the typed om interfaces since
getComputedStyle() returns the resolved value for the 'transform'
property.
Blink component
Blink>CSS
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>
TAG review
None
TAG review status
Not applicable
Risks
Interoperability and Compatibility
None
/Gecko/: Positive Implementation behind a flag.
/WebKit/: Shipped/Shipping
/Web developers/: No signals
/Other signals/:
WebView application risks
Does this intent deprecate or change behavior of existing APIs, such
that it has potentially high risk for Android WebView-based applications?
None
Debuggability
No additional devtools support necessary compared to existing syntaxes.
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
Yes
https://wpt.fyi/css/css-properties-values-api/animation/custom-property-animation-list-type-mismatch.html
https://wpt.fyi/css/css-properties-values-api/animation/custom-property-animation-transform-function.html
https://wpt.fyi/css/css-properties-values-api/animation/custom-property-animation-transform-list-multiple-values.html
https://wpt.fyi/css/css-properties-values-api/animation/custom-property-animation-transform-list-single-values.html
https://wpt.fyi/css/css-properties-values-api/animation/custom-property-transition-transform-function.html
https://wpt.fyi/css/css-properties-values-api/animation/custom-property-transition-transform-list.html
https://wpt.fyi/css/css-properties-values-api/at-property.html
https://wpt.fyi/css/css-properties-values-api/registered-property-computation.html
https://wpt.fyi/css/css-properties-values-api/registered-property-initial.html
https://wpt.fyi/css/css-properties-values-api/register-property-syntax-parsing.html
https://wpt.fyi/css/css-properties-values-api/typedom.html
These 5 tests have a lot of failures, is that expected?
*
https://wpt.fyi/results/css/css-properties-values-api/animation/custom-property-animation-transform-function.html?label=master&label=experimental&aligned
*
https://wpt.fyi/results/css/css-properties-values-api/animation/custom-property-animation-transform-list-multiple-values.html?label=experimental&label=master&aligned
*
https://wpt.fyi/results/css/css-properties-values-api/animation/custom-property-animation-transform-list-single-values.html?label=experimental&label=master&aligned
*
https://wpt.fyi/results/css/css-properties-values-api/animation/custom-property-transition-transform-function.html?label=experimental&label=master&aligned
*
https://wpt.fyi/results/css/css-properties-values-api/animation/custom-property-transition-transform-list.html?label=experimental&label=master&aligned
Flag name on chrome://flags
#enable-experimental-web-platform-features
Finch feature name
CSSVariables2TransformValues
Requires code in //chrome?
False
Tracking bug
https://crbug.com/911156
Estimated milestones
Shipping on desktop 120
DevTrial on desktop 115
Shipping on Android 120
DevTrial on Android 115
Shipping on WebView 120
Anticipated spec changes
Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github
issues in the project for the feature specification) whose resolution
may introduce web compat/interop risk (e.g., changing to naming or
structure of the API in a non-backward-compatible way).
None
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5184552188510208
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
--
Rune Lillesveen
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