Contact [email protected]

Specificationhttps://drafts.fxtf.org/css-masking/#positioned-masks

Summary

This is a follow-on to the improved CSS mask support in chromium 120 (
https://chromestatus.com/feature/5839739127332864) and adds new mask
support to SVG (multiple masks, as well as mask-mode, mask-composite,
mask-position, and mask-repeat). In addition, remote SVG masks (e.g., mask:
url(masks.svg#star)) are now supported. Explainer:
https://docs.google.com/document/d/1IzQv56NzfV1hA6YPr2j1chtb5qijNxykkYY7JyccZgc/edit?usp=sharing


Blink componentBlink>CSS
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>

TAG reviewNone

TAG review statusNot applicable

Risks


Interoperability and Compatibility

Firefox supports all of this behavior. There is low compatibility risk as
this adds new support that previously wouldn't work.


*Gecko*: Shipped/Shipping Firefox has nearly 100% pass rate on css-masking
WPT tests.

*WebKit*: No signal

*Web developers*: Strongly positive (
https://github.com/web-platform-tests/interop/issues/148) This is part of
interop-2023.

*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

Basic debugging support with existing CSS support in devtools.


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/results/css/css-masking?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&view=interop


Flag name on chrome://flags

Finch feature nameCSSMaskingInterop

Requires code in //chrome?False

Tracking bughttps://crbug.com/1496470

Estimated milestones
Shipping on desktop 121
Shipping on Android 121
Shipping on WebView 121

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/5138520058626048

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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