Hey,

0.04% seems like a fairly sizable number. Do you know what the breakage
looks like or whether this usage is limited to a library/a small set of
large websites or something else?

Ideally, this is feature detected with some fallback syntax


On Tue, May 21, 2024 at 1:39 PM Joey Arhar <[email protected]> wrote:

> Contact [email protected]
>
> ExplainerNone
>
> Specificationhttps://github.com/whatwg/html/pull/8467
>
> Summary
>
> The CSS custom state pseudo-class is being renamed from :--foo to
> :state(foo). The new syntax, :state(foo), has been enabled by default, and
> now we have to deprecate and remove the :--foo syntax. Gecko and webkit
> never implemented the old syntax and they have both shipped the new syntax.
> We are currently shipping both the new syntax and the old syntax at the
> same time. There have been console errors and DevTools deprecations for the
> old syntax for many milestones already. Previous thread on this topic:
> https://groups.google.com/a/chromium.org/g/blink-dev/c/JvpHoUfhJYE/m/uRtWiqoHAQAJ
> The UseCounter is currently at 0.04%
> https://chromestatus.com/metrics/feature/timeline/popularity/3796
>
>
> Blink componentBlink>HTML>CustomElements
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EHTML%3ECustomElements>
>
> Motivation
>
> The syntax of this feature needs to change in order to get support from
> the other browsers and eventually have interoperable behavior.
>
>
> Initial public proposalNone
>
> TAG reviewNone
>
> TAG review statusNot applicable
>
> Risks
>
>
> Interoperability and Compatibility
>
> Websites which are currently using the old syntax and don't migrate to the
> new syntax will have CSS selectors which become invalid which would impact
> the styling of their custom elements.
>
>
> *Gecko*: Positive Firefox has shipped the new syntax
>
> *WebKit*: Positive (
> https://github.com/whatwg/html/pull/8467#issuecomment-1381645661) Safari
> has shipped the new syntax
>
> *Web developers*: No signals
>
> *Other signals*:
>
> Activation
>
> Switching to the new syntax is easy.
>
>
> 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
>
> None
>
>
> 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/custom-elements/state
>
>
> Flag name on chrome://flagsNone
>
> Finch feature nameCSSCustomStateDeprecatedSyntax
>
> Requires code in //chrome?False
>
> Tracking bughttps://issues.chromium.org/issues/41486953
>
> Estimated milestones
>
> No milestones specified
>
>
> Link to entry on the Chrome Platform Status
> https://chromestatus.com/feature/5140610730426368?gate=4940354997714944
>
> Links to previous Intent discussions
> https://groups.google.com/a/chromium.org/g/blink-dev/c/JvpHoUfhJYE/m/uRtWiqoHAQAJ
>
> This intent message was generated by Chrome Platform Status
> <https://chromestatus.com/>.
>
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> .
>

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