LGTM2.
(I filed https://github.com/whatwg/compat/issues/252 - thanks for the doc!)
On 10/27/23 5:55 AM, Philip Jägenstedt wrote:
LGTM1
Thanks for writing that up, Philip! I believe that should be helpful
for release notes and MDN docs down the line.
On Thu, Oct 26, 2023 at 7:20 PM 'Philip Rogers' via blink-dev
<blink-dev@chromium.org> wrote:
On Wednesday, October 25, 2023 at 7:24:34 AM UTC-7 Mike Taylor wrote:
On 10/25/23 10:00 AM, Philip Rogers wrote:
Contact emails p...@chromium.org, tca...@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.
Good idea. I've created a document describing the differences at
the following link:
https://docs.google.com/document/d/14TtdFgYJ6TJuVzSE2Ra_gtuy20VNRgIKcbwiF3hg9aQ/preview?usp=sharing
/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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