On 6/25/24 5:31 PM, Stefan Zager wrote:

On Tue, Jun 25, 2024 at 1:54 PM Mike Taylor <miketa...@chromium.org> wrote:

    On 6/25/24 4:23 PM, Stefan Zager wrote:

    On Tue, Jun 25, 2024 at 7:24 AM Mike Taylor
    <miketa...@chromium.org> wrote:

        Thanks for creating this - can you clarify how long you would
        like this deprecation trial to last?

    That will depend on the response from site owners and the level
    of uptake, but the initial period will be one year.

    Typically it is feature teams that determine the length of a
    deprecation trial, rather than site owners - based on webcompat
    analysis, which may include outreach to known affected sites. Per
    https://www.chromium.org/blink/launching-features/#deprecation-trial
    - deprecation trials normally only last 6 milestones, and are
    renewed in 6 milestone increments. However, exceptions are
    possible with 3 LGTMs.

    If you think 1 year is the correct length for the ecosystem, can
    you please provide justification for an exception here?

I mistakenly thought that one year was the standard period for a deprecation trial; in light of that documentation, I think six months is appropriate.

No worries - we can revisit in 6 months if needed.

LGTM


        On 6/24/24 7:52 PM, Stefan Zager wrote:


                Contact emails

        sza...@chromium.org


                Explainer

        None


                Specification

        https://github.com/w3c/csswg-drafts/pull/9699


                Design docs


        
https://docs.google.com/document/d/1AcnDShjT-kEuRaMchZPm5uaIgNZ4OiYtM4JI9qiV8Po/edit


                Summary

        Create a reverse origin trial to allow sites to opt out of
        the "Standardized CSS Zoom" feature
        <https://chromestatus.com/feature/5198254868529152>.
        Existing sites may rely on chromium's legacy
        non-spec-compliant behavior of the CSS zoom property. This
        origin trial will allow individual sites to opt out of the
        new spec-compliant behavior, to allow them time to migrate
        to the newly-specified behavior.


                Blink component

        Blink>Paint
        
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EPaint>


                TAG review

        None


                TAG review status

        Pending


                Risks



                Interoperability and Compatibility

        This is meant to mitigate the compatibility risks of the
        Standardized CSS Zoom feature. The origin trial will have a
        limited duration, so sites that participate in the origin
        trial but are not updated to support the new behavior will
        still break when the origin trial ends.


                WebView application risks

        See Interoperability and Compatibility risks



                Goals for experimentation

        To provide a reprieve for sites that are broken by the new
        zoom behavior.


                Ongoing technical constraints

        None



                Debuggability

        None



                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>?

        The legacy chromium-specific behavior is tested by
        chromium-internal tests, but not WPT.


                Flag name on chrome://flags

        StandardizedBrowserZoom


                Finch feature name

        StandardizedBrowserZoom


                Requires code in //chrome?

        False


                Estimated milestones

        M128



                Link to entry on the Chrome Platform Status

        https://chromestatus.com/feature/5198254868529152


                Links to previous Intent discussions


        
https://groups.google.com/a/chromium.org/g/blink-dev/c/W8j6RKDeRoM/m/FyCKOAG9AAAJ

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