LGTM2

/Daniel

On 2025-06-13 03:42, TAMURA, Kent wrote:
LGTM1.
The risk by shipping this feature would be very small.


On Fri, Jun 13, 2025 at 10:39 AM Domenic Denicola <dome...@chromium.org> wrote:

    I'll recuse myself from LGTMing this given that I drove the spec
    work, but I want to encourage other API owners to approve it. This
    fixes a small, but quite annoying, pain point, which we've heard
    complaints about since at least 2014
    <https://www.w3.org/Bugs/Public/show_bug.cgi?id=24271>. I'm really
    glad that we've taken the time as the Chromium project to work on
    this sort of thing.

    I agree with Joey's assessment that a TAG review is not needed for
    this sort of small loosening.

    Also, my judgement is that doing a normal rollout (with a Finch
    killswitch) is probably better than a Finch rollout, just for
    developer predictability. I think the compatibility risks of
    throwing /less/ are basically nonexistent. But I don't feel strongly.

    On Friday, June 13, 2025 at 7:05:49 AM UTC+9 Joey Arhar wrote:


                Contact emails

        jar...@chromium.org


                Explainer

        None


                Specification

        https://dom.spec.whatwg.org/#namespaces


                Summary

        The HTML parser has always (or for a long time) allowed
        elements and attributes to have a wide variety of valid
        characters and names, but the javascript DOM APIs to create
        the same elements and attributes are more strict and don't
        match the parser. This change relaxes the validation of the
        javascript DOM APIs to match the HTML parser. More context
        here: https://github.com/whatwg/dom/issues/849 I don't
        anticipate any compat issues from this change because all of
        the previously allowed element/attribute names are still
        allowed with the new behavior.


        WHATWG has merged the spec changes for this already:

        - https://github.com/whatwg/dom/pull/1079

        - https://github.com/whatwg/html/pull/7991


                Blink component

        Blink>DOM
        
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EDOM%22>


                TAG review

        None


                TAG review status

        Not applicable


                Risks



                Interoperability and Compatibility

        I believe it is very likely that webkit and gecko will ship
        this change after we do, so I believe that the
        interoperability and compat risks are low.



        /Gecko/: No signal - This spec PR lists gecko as an interested
        implementor, so maybe firefox view is positive?
        https://github.com/whatwg/dom/pull/1079

        /WebKit/: No signal

        /Web developers/: Positive
        (https://github.com/whatwg/dom/issues/849#issuecomment-2876716958)

        /Other signals/:


                Ergonomics

        The validation of element and attribute names is fairly
        isolated and the new validation logic does not have different
        complexity than the old logic. The default usage of this API
        will not make it hard for chrome to maintain good performance.



                Activation

        It will not be hard to developers to use this change
        immediately, and I don't think we need outreach for it. It is
        more of a bug fix than a new feature.



                Security

        https://github.com/whatwg/dom/issues/849#issuecomment-1090076902



                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

        If an element or attribute name is not allowed, then just like
        with the old logic an exception will be thrown explaining that
        the name is not valid. There are no specialized DevTools
        features for this name validation, and I don't think any
        DevTools changes are needed for this feature.



                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://github.com/web-platform-tests/wpt/pull/38503
        https://chromium-review.googlesource.com/c/chromium/src/+/6570951
        https://github.com/web-platform-tests/wpt/pull/52982
        https://chromium-review.googlesource.com/c/chromium/src/+/6615057


                Flag name on about://flags

        None


                Finch feature name

        RelaxDOMValidNames


                Rollout plan

        This seems fairly safe so I was going to go with "Will ship
        enabled for all users," but there is no rush for this change
        so I am thinking that rolling out via finch would be better
        just to be safe.


                Requires code in //chrome?

        False


                Tracking bug

        https://issues.chromium.org/issues/40228234


                Measurement

        I didn't add UseCounters for this, and I don't think it is
        necessary to track.


                Estimated milestones

        No milestones specified



                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).

        None


                Link to entry on the Chrome Platform Status

        https://chromestatus.com/feature/6278918763708416?gate=5097618073714688

        This intent message was generated by Chrome Platform Status
        <https://chromestatus.com/>.

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--
TAMURA Kent
Software Engineer, Google


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