LGTM1. Interoperability/compatibility risk is very low.
On Wed, Aug 5, 2026 at 6:24 AM Javier Fernandez <[email protected]> wrote: > *Contact emails* > [email protected] > > *Specification* > https://www.w3.org/TR/css-typed-om-1/#stylevalue-subclasses > > *Summary* > The CSS Typed OM spec exposes the CSSStyleValue hierarchy to worker global > scopes ([Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]), but Blink > only exposed CSSStyleValue, CSSKeywordValue, CSSNumericValue, CSSUnitValue > and CSSUnparsedValue to Window and the worklets. As a result these > constructors were undefined in Workers, unlike in Firefox and Safari. > > *Blink component* > Blink>CSS > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22> > > *Web Feature ID* > css-typed-om <https://webstatus.dev/features/css-typed-om> > > *Motivation* > Aligns Chrome with the spec's [Exposed] set and removes a cross‑thread > inconsistency (these constructors are currently undefined in workers); > enables off‑main‑thread CSS value manipulation > > *Initial public proposal* > *No information provided* > > *TAG review* > *No information provided* > > *TAG review status* > Not applicable > > *Goals for experimentation* > None > > *Risks* > > > *Interoperability and Compatibility* > This feature is already shipped by Firefox and Safari and it's purely > additive worker‑scope exposure; zero change to existing Window behavior; > matches the spec. Only theoretical risk: content that feature‑detects these > globals inside a worker > > *Gecko*: Shipped/Shipping > > *WebKit*: Shipped/Shipping > > *Web developers*: No signals > > *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? > *No information provided* > > > *Debuggability* > No special tooling; interfaces work in the worker DevTools console like > any other worker‑exposed API > > *Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, ChromeOS, 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 > css/css-typed-om/stylevalue-subclasses/*.any.js (global=window,worker): > cssKeywordValue, cssKeywordValue-value, cssUnparsedValue-empty, > numeric-objects/cssUnitValue-to; and (full‑scope) the converted > create-a-type, cssMathInvert-type, cssMathNegate-type, add-two-types, > cssnumericvalue-multiply-two-types, arithmetic, to .any.js. (The CSSMath* > ones require the full‑scope exposure.) > https://wpt.fyi/results/css/css-typed-om/stylevalue-subclasses?label=experimental&label=master&aligned > > *Flag name on about://flags* > *No information provided* > > *Finch feature name* > *No information provided* > > *Non-finch justification* > This is just a minor CSS change to allow some CSS javascript bindings to > be run in Worker context, but that were already exposed to the Web via > Window context. > > *Rollout plan* > Will ship enabled for all users > > *Requires code in //chrome?* > False > > *Tracking bug* > https://issues.chromium.org/issues/534781956 > > *Estimated milestones* > Shipping on desktop 153 > Shipping on Android 153 > Shipping on WebView 153 > > *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). > https://github.com/w3c/csswg-drafts/issues/14229 > > *Link to entry on the Chrome Platform Status* > https://chromestatus.com/feature/5114591051907072?gate=6116938171416576 > > This intent message was generated by Chrome Platform Status > <https://chromestatus.com/>. > > > -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/0786569a-3c4b-421c-af22-a6bc4a717ccc%40igalia.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/0786569a-3c4b-421c-af22-a6bc4a717ccc%40igalia.com?utm_medium=email&utm_source=footer> > . > -- TAMURA Kent Software Engineer, Google -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGH7WqFXhBZPTvHif0oH5AuOfatxZejZ%2BPNuBPrUdZo8N62M5Q%40mail.gmail.com.
