Some of the linked tests have failures in Chrome, should those failures be fixed or are some of the linked tests not for this feature?
On Wed, Oct 28, 2026 at 3:56 PM Daniel Bratell <[email protected]> wrote: > LGTM2 (Adoption now added) > > /Daniel > On 2026-10-28 06:24, Chris Harrelson wrote: > > Actually I take that back - I'll add my LGTM once the Adoption gate is > filled out in the Chromestatus entry. > > On Wed, Oct 28, 2026 at 5:23 AM Chris Harrelson <[email protected]> > wrote: > >> LGTM2 >> >> On Tue, Oct 27, 2026 at 7:08 PM Alex Russell <[email protected]> >> wrote: >> >>> LGTM1; thanks for the note about interop risk, makes this easier to >>> approve. >>> >>> On Monday, October 26, 2026 at 2:56:32 PM UTC-7 Chromestatus wrote: >>> >>>> *Contact emails* >>>> [email protected] >>>> >>>> *Specification* >>>> https://drafts.csswg.org/css-values-4/#linked-properties >>>> >>>> *Summary* >>>> Makes the computed value of the background-* longhands keep the number >>>> of comma-separated values the author specified, instead of repeating or >>>> truncating it to the background-image layer count. Repeating and truncating >>>> are used-value behavior: "The computed values of the coordinating list >>>> properties are not affected by such truncation or repetition." This feature >>>> would implement the behavior defined in the >>>> https://drafts.csswg.org/css-values-4/ Appendix A. >>>> >>>> *Blink component* >>>> Blink>CSS >>>> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22> >>>> >>>> *Web Feature ID* >>>> background <https://webstatus.dev/features/background> >>>> >>>> *Motivation* >>>> The behavior defined in the "Appendix A: Coordinating List-Valued >>>> Properties" of the CSS Values And Units L4 specification has been discussed >>>> recently and agreed that it should stand. This makes Chrome the only >>>> browser diverging in the specified behavior. >>>> >>>> *Initial public proposal* >>>> *No information provided* >>>> >>>> *TAG review* >>>> *No information provided* >>>> >>>> *TAG review status* >>>> Not applicable >>>> >>>> *Goals for experimentation* >>>> None >>>> >>>> *Risks* >>>> >>>> >>>> *Interoperability and Compatibility* >>>> The new behavior this feature provides is implemented already by >>>> Firefox and Safari, so it's Chrome catching up in this case; hence, the >>>> interop risk is zero. Regarding compatibility, making the background-* >>>> properties align "coordinated list group" is what matches the current >>>> specified behavior, which the CSSWG agreed on keep. Some engines >>>> implemented weird truncation rules, that's why there were some WPT not >>>> following the spec. The resolution [1] was to update the tests and observe >>>> whether any compat issue appears in the next months. [1] >>>> https://github.com/w3c/csswg-drafts/issues/12791#issuecomment-4040285092 >>>> >>>> *Gecko*: Shipped/Shipping Firefox was the only one implementing the >>>> behavior defined in the spec. >>>> https://github.com/w3c/csswg-drafts/issues/12791#issuecomment-4040285092 >>>> >>>> *WebKit*: Shipped/Shipping ( >>>> https://developer.apple.com/documentation/safari-technology-preview-release-notes/stp-release-246) >>>> See >>>> the bug https://bugs.webkit.org/show_bug.cgi?id=315771 for details >>>> >>>> *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 information provided* >>>> >>>> *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 >>>> * >>>> https://wpt.fyi/results/css/css-backgrounds/parsing?label=experimental&label=master&aligned >>>> * >>>> https://wpt.fyi/results/css/css-backgrounds/animations/background-position-interpolation.html?label=experimental&label=master&aligned >>>> * >>>> https://wpt.fyi/results/css/css-backgrounds/animations/background-size-interpolation.html?label=experimental&label=master&aligned >>>> * >>>> https://wpt.fyi/results/css/css-masking/parsing?label=experimental&label=master&aligned >>>> >>>> *Flag name on about://flags* >>>> *No information provided* >>>> >>>> *Finch feature name* >>>> *No information provided* >>>> >>>> *Non-finch justification* >>>> *No information provided* >>>> >>>> *Rollout plan* >>>> Will ship enabled for all users >>>> >>>> *Requires code in //chrome?* >>>> False >>>> >>>> *Tracking bug* >>>> https://issues.chromium.org/issues/40855581 >>>> >>>> *Estimated milestones* >>>> Shipping on desktop 159 >>>> Shipping on Android 159 >>>> Shipping on WebView 159 >>>> Shipping on iOS 159 >>>> >>>> *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). >>>> *No information provided* >>>> >>>> *Link to entry on the Chrome Platform Status* >>>> https://chromestatus.com/feature/5144333908049920?gate=6114123363516416 >>>> >>>> *Links to previous Intent discussions* >>>> Intent to Prototype: >>>> https://groups.google.com/a/chromium.org/g/blink-dev/c/eny3Exk0b8w/m/HiXscXadAgAJ >>>> >>>> >>>> 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/1a9a7278-d5a2-42a7-8556-2086d23e5fa9n%40chromium.org >>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/1a9a7278-d5a2-42a7-8556-2086d23e5fa9n%40chromium.org?utm_medium=email&utm_source=footer> >>> . >>> >> -- > 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/CAOMQ%2Bw9dAoRhzA_%2BfU2Tg%2BSbBvPapj_oxcUnXRkFTy_%2BxUdSWg%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOMQ%2Bw9dAoRhzA_%2BfU2Tg%2BSbBvPapj_oxcUnXRkFTy_%2BxUdSWg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > -- > 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/4cff63cc-b182-4a2d-8957-981c94aeafae%40gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/4cff63cc-b182-4a2d-8957-981c94aeafae%40gmail.com?utm_medium=email&utm_source=footer> > . > -- 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/CAARdPYcCUbSGEy1ZsxfyVhbKTnuthSE2hNvwJ%2ByAz7HPR30fhQ%40mail.gmail.com.
