LGTM2
On 10/11/23 7:06 AM, Daniel Bratell wrote:
LGTM1
(Privacy and Security steps in Chromestatus are not completed but they
are unlikely to affect anything)
/Daniel
On 2023-10-04 12:23, Rune Lillesveen wrote:
On Wed, Oct 4, 2023 at 11:08 AM Rune Lillesveen
<futh...@chromium.org> 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 <image> syntax for custom properties
registered with @property or registerProperty(). The <image>
syntax can be used to restrict values of the custom property to
url() values and generated images like gradients.
This syntax was initially excluded from the valid syntaxes mainly
because images were not interpolable and that it would add to the
usefulness of the syntax to be able to interpolate directly on
the custom property. The other engines have shipped the image
syntax without supporting interpolation. There are two
interpolation methods in css-image-4, cross-fade() and per stop
interpolation for gradients. The gradient interpolation is not
shipped by any browser (even for standard properties). Safari
ships a non-standard compliant cross-fade() interpolation for
standard properties (at least for background-image), but not for
the registered custom properties.
We have an OKR to look into cross-fade() for Q4. If we end up
shipping that, it will work for both registered custom properties
and standard properties.
The <image> syntax for registered custom properties is part of
Interop 2023.
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/: Shipped/Shipping Does not support interpolation
Sorry, this is not correct. It's implemented behind a flag, not
shipping yet.
/WebKit/: Shipped/Shipping Does not support interpolation
/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/at-property.html
https://wpt.fyi/css/css-properties-values-api/register-property-syntax-parsing.html
https://wpt.fyi/css/css-properties-values-api/typedom.html
Flag name on chrome://flags
#enable-experimental-web-platform-features
Finch feature name
CSSVariables2ImageValues
Requires code in //chrome?
False
Estimated milestones
Shipping on desktop 120
DevTrial on desktop 115
Shipping on Android 120
DevTrial on Android 115
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/5142205606133760
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
--
Rune Lillesveen
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Rune Lillesveen
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