On Wed, Apr 5, 2023 at 12:11 AM Yoav Weiss <[email protected]> wrote:

>
>
> On Fri, Mar 31, 2023 at 3:50 PM David Awogbemila <[email protected]>
> wrote:
>
>> Contact emails
>> [email protected], [email protected]
>>
>> Explainer
>> https://github.com/argyleink/scrollend-explainer/blob/main/README.md
>>
>
> The explainer says this shipped in 114. I guess it should say y'all are
> expecting to ship at that point :)
>
>
>>
>> Specificationhttps://drafts.csswg.org/cssom-view/#scrolling-events
>>
>> Summary
>>
>> Scrollend events help developers reliably tell when a scroll has
>> completed (including both the scroll itself and any updates to offsets from
>> the scroll). Knowing when a scroll has completed is useful for various
>> reasons, e.g. synchronizing some logic on the snapped section, fetching
>> stuff in a list, triggering new animations, etc. This feature greatly
>> simplifies the logic for handling end-of-scroll effects, ensuring that they
>> are consistent across many different input modalities. Currently,
>> developers address this need by observing scroll events and building ad-hoc
>> timeout algorithms.
>>
>>
>> Blink componentBlink>Scroll
>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EScroll>
>>
>> Search tagsscroll <https://chromestatus.com/features#tags:scroll>
>>
>> TAG review
>>
>> TAG review statusNot applicable
>>
>
> Agree this is not needed, as this is following WG agreed-upon behavior,
> that has already shipped in one implementation.
>
>
>>
>>
>> Risks
>>
>>
>> Interoperability and Compatibility
>>
>>
>>
>> *Gecko*: Shipped/Shipping (
>> https://bugzilla.mozilla.org/show_bug.cgi?id=1797013)
>>
>> *WebKit*: No signal (
>> https://github.com/WebKit/standards-positions/issues/150) There hasn't
>> been an explicit position attached to the position request yet but there is
>> a tracking WebKit issue: https://bugs.webkit.org/show_bug.cgi?id=201556
>>
>> *Web developers*: Positive (
>> https://twitter.com/nghuuphuoc/status/1618806085158051846?s=20) Other
>> examples: https://twitter.com/radogado/status/1621479592123826184?s=20
>> https://twitter.com/ebidel/status/1621037204297637891?lang=en
>>
>> *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?
>>
>> Not potentially high risk.
>>
>>
>> Debuggability
>>
>> We verified via Protocol Monitor that DevTools supports breaking on
>> scrollend listeners, similar to other events. DevTools UI change is needed
>> to make this accessible which will be done via crrev.com/c/4376080.
>>
>>
>> Will this feature be supported on all six Blink platforms (Windows, Mac,
>> Linux, Chrome OS, 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/dom/events/scrolling?label=master&label=experimental&aligned
> paints an odd picture, where our current experimental implementation passes
> some of the tests, but not others, and Firefox seems to be failing some of
> them.
> Can you elaborate on the end state you're expecting once this ships?
>
We should have filtered that wpt.fyi link to scrollend tests:
https://wpt.fyi/results/dom/events/scrolling?label=master&label=experimental&aligned&q=scrollend
We expect the scrollend tests to pass on all the browsers except Safari
which doesn't support scrollend yet I believe.
I've looked more closely into the failures and filed crbug.com/1430947
explaining the reasons they are failing should have them all fixed soon.
They are mostly issues with the way the tests are written.

>
>
>>
>>
>> Flag nameN/A base::Feature is autogenerated from
>> runtime_enabled_features.json5
>> <https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/platform/runtime_enabled_features.json5;l=2920?q=%22name:%20%22ScrollEndEvents%22%22&sq=&ss=chromium%2Fchromium%2Fsrc>
>>
>> Requires code in //chrome?False
>>
>> Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=907601
>>
>> Estimated milestones
>> M114
>>
>> 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).
>>
>>
>> Link to entry on the Chrome Platform Status
>> https://chromestatus.com/feature/5186382643855360
>>
>> This intent message was generated by Chrome Platform Status
>> <https://chromestatus.com/>.
>>
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>>
>

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