On 10/25/23 10:00 AM, Philip Rogers wrote:
Contact emails
p...@chromium.org, tcap...@chromium.org, yo...@chromium.org, f...@opera.com
Explainer
None
Specification
https://drafts.fxtf.org/css-masking/#positioned-masks
Design docs
https://developer.mozilla.org/en-US/docs/Web/CSS/mask
Summary
CSS mask, and related properties such as mask-image, mask-mode, etc,
are used to hide an element (partially or fully) by masking or
clipping the image at specific points. This feature unprefixes the
-webkit-mask* properties and brings them up to spec. This includes
mask-image, mask-mode, mask-repeat, mask-position, mask-clip,
mask-origin, mask-size, and mask-composite, as well as the "mask"
shorthand. Local mask-image references are supported, serialization
now matches the spec, and accepted values now match the spec (for
example, "add" instead of "source-over" for mask-composite).
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
There is some compatibility risk in adding an unprefixed feature while
still supporting the prefixed version. This is minimized as we are
following the same pattern Webkit has already shipped. In addition,
Firefox supports several of the legacy -webkit- prefixed properties too.
Is there anywhere that documents the differences, beyond what is written
in the summary? It would be nice if we can capture that in the Compat
standard, where they are no longer simple aliases.
/Gecko/: Shipped/Shipping Firefox has nearly 100% pass rate on
css-masking WPT tests.
/WebKit/: Shipped/Shipping Safari has shipped much of the unprefixing
of these properties (https://bugs.webkit.org/show_bug.cgi?id=229082),
as well as many implementation improvements, though some interop fixes
are still in development.
/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
<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
None
Finch feature name
CSSMaskingInterop
Requires code in //chrome?
False
Tracking bug
https://crbug.com/1418401
Measurement
https://chromestatus.com/metrics/css/timeline/popularity/772
Estimated milestones
Shipping on desktop 120
DevTrial on desktop 120
Shipping on Android 120
DevTrial on Android 120
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/5839739127332864
Links to previous Intent discussions
Intent to prototype:
https://groups.google.com/a/chromium.org/g/blink-dev/c/C6hENTlF0NM
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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