LGTM1

On Thu, Oct 13, 2022 at 11:06 AM Xiaocheng Hu <xiaoche...@chromium.org>
wrote:

> Hi all,
>
> Here's an update as now the trunk has reached M109, the target milestone
> for the removal.
>
> Event.path has been fully disabled on Canary & Dev, 50% on Beta and 1% on
> Stable. To help migration, an enterprise policy
> <https://chromeenterprise.google/policies/#EventPathEnabled> is also
> added to extend the availablility of Event.path until M115.
>
> Despite the usage number
> <https://chromestatus.com/metrics/feature/timeline/popularity/345> still
> being high, I think the actual compat risks of the removal is low because:
> - The feature is never supported by WebKit or Gecko, yet there's no bug
> reports for them
> - Since the partial disabling, we have received only one complaint
> <https://groups.google.com/a/chromium.org/g/chromium-dev/c/xt4XJYpoHXo/m/yBW13BXvAAAJ>,
> which appears resolved by the enterprise policy
> - HTTPArchive source analysis
> <https://docs.google.com/document/d/1JUeNc-ZxxWTn2tz9M_DJ4cV-M8lBdp40xlnfQ2-Mhgg/edit>
> (done in June) shows that very few (<0.1%) pages actually have a usage that
> will fail after the removal; Many other pages are using the feature with
> Event.composedPath() or some ad hoc code as a fallback, or are not real
> usage (e.g., cloning every attribute of an Event object, hence triggering
> the use counter without actually using it)
>
>
>
> On Tuesday, February 8, 2022 at 4:25:57 PM UTC-8 Xiaocheng Hu wrote:
>
>> Contact emailsxiaoche...@chromium.org
>>
>> ExplainerNone
>>
>> SpecificationNone. Not a standard feature.
>>
>> Summary
>>
>> Event.path is a non-standard API that returns the event's path, which is
>> an array of the objects on which listeners will be invoked. It is supported
>> by Blink only, causing web compatibility issues. Web developers should
>> switch to the equivalent standard API Event.composedPath(), which returns
>> the same result.
>>
>>
>> Blink componentBlink>DOM
>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EDOM>
>>
>> TAG review
>>
>> TAG review statusNot applicable
>>
>> Risks
>>
>>
>> Interoperability and Compatibility
>>
>> The removal of this API should improve interoperability, as it's
>> supported by Blink only. It still has 18% usage as of Feb 2022 (
>> https://chromestatus.com/metrics/feature/timeline/popularity/345), so we
>> will only deprecate it for now, and will not remove it before the usage
>> drops low enough. We expect low compatibility risks, since there is an
>> equivalent standard API (Event.composedPath()) by all browsers, and the
>> following polyfill should also keep existing sites functioning with minimum
>> changes: if (!Event.prototype.path) {
>> Object.defineProperty(Event.prototype, 'path', { get() { return
>> this.composedPath(); } }); }
>>
>>
>> Gecko: No signal Firefox does not support Event.path
>>
>> WebKit: No signal Safari does not support Event.path
>>
>> Web developers: Positive (
>> https://github.com/web-platform-tests/interop-2022/issues/26)
>>
>> Other signals:
>>
>>
>> Debuggability
>>
>> Usage of this deprecated feature will be reported to the DevTools Issues
>> Tab.
>>
>>
>> Is this feature fully tested by web-platform-tests
>> <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>
>> ?No
>>
>> Flag name
>>
>> Requires code in //chrome?False
>>
>> Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1277431
>>
>> Estimated milestones
>>
>> No milestones specified
>>
>>
>> Link to entry on the Chrome Platform Status
>> https://chromestatus.com/feature/5726124632965120
>>
>> This intent message was generated by Chrome Platform Status
>> <https://chromestatus.com/>.
>>
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