Hi,
Done, thanks !
On 9/29/25 06:33, 一丝 wrote:
I've noticed that CL also implements the two-value syntax for
`mask-position-x/y`. Could you update this information in
Chromestatus? This would be helpful for web compatibility.
https://chromium-review.googlesource.com/c/chromium/src/+/6811401/10/third_party/blink/web_tests/wpt_internal/css/css-masking/parsing/webkit-mask-position-x-valid.html
在2025年9月22日星期一 UTC+8 16:34:29<Chromestatus> 写道：
*Contact emails*
[email protected]
*Explainer*
None
*Specification*
https://drafts.csswg.org/css-backgrounds-4/#background-position-longhands
*Summary*
Defines the background image's position relative to one of its
edges. This syntax gives web authors a more flexible and
responsive mechanisms to define the background image position,
instead of using fixed values that need to be adapted to the
window's or frame's size.
*Blink component*
Blink>CSS
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22>
*Web Feature ID*
background-position
<https://webstatus.dev/features/background-position>
*Motivation*
One important motivation is interoperability, given that Chrome is
the only browser that lacks this syntax for the
background-position-x/y longhands. Additionally, the
background-position shorthand, which sets both the x/y positions,
already supports the side-relative syntax, so the lack of the same
syntax in the longhands may confuse web developers. There is no
specific explainer, but this MDN page should be enough to
understand the feature:
https://developer.mozilla.org/en-US/docs/Web/CSS/background-position-x
*Initial public proposal*
None
*TAG review*
None
*TAG review status*
Not applicable
*Risks*
*Interoperability and Compatibility*
This feature doesn't imply any interoperability risk, but the
contrary, since Chrome needs to catch up in order to provide the
same functionality than Firefox and Safari. There is no
back-compatibility risk, because the old syntax is still valid if
this feature is implemented.
/Gecko/: Shipped/Shipping
/WebKit/: Shipped/Shipping
/Web developers/:
Positive (https://issues.chromium.org/issues/40468636) The issue
has 15 votes by now.
/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*
The feature can be tested and debugged using the regular Chrome
DevTools support (eg, css style inspection)
*Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yeshttps://wpt.fyi/results/css/css-backgrounds/parsing?label=master&label=experimental&aligned&q=background-position-x
<https://wpt.fyi/results/css/css-backgrounds/parsing?label=master&label=experimental&aligned&q=background-position-x>
https://wpt.fyi/results/css/css-backgrounds/parsing?label=master&label=experimental&aligned&q=background-position-y
<https://wpt.fyi/results/css/css-backgrounds/parsing?label=master&label=experimental&aligned&q=background-position-y>
*Flag name on about://flags*
None
*Finch feature name*
None
*Non-finch justification*
None
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/40468636
*Estimated milestones*
No milestones specified
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/5073321259565056?gate=5093327095595008
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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