Hey Rahul! A few things missing with the intent:
- An explainer would be helpful to clarify the motivation for this and if this has any web exposed impact (and e.g. how would developers that want to keep to current behavior could cope with different engines doing different things) - Is this specified? I see the WG discussion, but not sure if a spec change followed - Can you ask for official Mozilla and WebKit positions? ( https://bit.ly/blink-signals) Cheers :) Yoav On Tue, May 24, 2022 at 8:08 PM Robert Flack <fla...@chromium.org> wrote: > > > On Tue, May 24, 2022 at 1:27 PM 'Rahul Arakeri' via input-dev < > input-...@chromium.org> wrote: > >> *Contact emails*: arak...@microsoft.com >> >> >> >> *CSSWG discussion*: [css-overscroll] Whether to move position:fixed >> elements during overscrolling · Issue #6299 · w3c/csswg-drafts (github.com) >> <https://github.com/w3c/csswg-drafts/issues/6299> >> >> >> >> *Summary*: Currently, position:fixed elements move when the scroller is >> overscrolled. With this change, we intend to prevent fixed elements from >> moving during an elastic overscroll. >> >> >> >> *Blink component*: Blink>Scroll >> <https://bugs.chromium.org/p/chromium/issues/list?q=component%3ABlink%3EScroll> >> >> >> >> >> *Chromestatus*: Prevent overscroll for fixed elements. - Chrome Platform >> Status (chromestatus.com) >> <https://chromestatus.com/feature/5381155556687872> >> >> >> >> *Risks*: >> >> - Interoperability: Firefox/Safari still moves fixed elements on >> overscroll. >> >> Just wanted to clarify, iOS Safari does not move fixed position elements > on overscroll except when you start scrolling at the scroller edge in order > to make room for the refresh affordance, so there's already some > inconsistency here. > > Also it is considered a bug that fixed content does still move on Safari > desktop > <https://github.com/w3c/csswg-drafts/issues/6299#issuecomment-1036996792> so > they would likely be willing to follow along with this change. > > >> >> - Interacting with websites will *feel* different (going forward) on >> platforms that support overscroll. This may lead to some web devs amending >> pages to preserve their original UX. We are currently running experiments >> in Microsoft Edge to determine user impact and would also discuss the >> possibility of doing origin trials in Chromium with Google engineers. >> >> >> >> *Debuggability*: N/A >> >> *Is this feature fully tested by web-platform-tests?* >> >> Yes. We did a dry run >> <https://chromium-review.googlesource.com/c/chromium/src/+/3651546> with >> the feature turned on and noticed test failures. They will need to be >> addressed before the feature can be turned on. >> >> *Flag name*: FixedElementsDontOverscroll >> >> - Usage: chrome.exe --enable-features=ElasticOverscroll >> --enable-blink-features=FixedElementsDontOverscroll >> >> >> >> *Estimated milestone*: >> >> 105 >> >> >> >> *Tracking bugs*: >> >> - Chromium: >> - 585766 - Overscroll shouldn't affect fixed elements - chromium >> <https://bugs.chromium.org/p/chromium/issues/detail?id=585766> >> - Firefox: >> - *https://github.com/mozilla/wg-decisions/issues/757 >> <https://github.com/mozilla/wg-decisions/issues/757>* >> - *https://bugzilla.mozilla.org/show_bug.cgi?id=1760368 >> <https://bugzilla.mozilla.org/show_bug.cgi?id=1760368>* >> - Webkit: >> - *https://bugs.webkit.org/show_bug.cgi?id=206227 >> <https://bugs.webkit.org/show_bug.cgi?id=206227>* >> >> >> >> *Misc:* >> >> - BlinkOn 16 talk: (1311) Keynote Presentation & Lightning Talks - >> Session 1 [BlinkOn 16] - YouTube >> <https://www.youtube.com/watch?v=o1pJJuQiCmQ&t=1378s> >> >> -- > 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 blink-dev+unsubscr...@chromium.org. > To view this discussion on the web visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAJh39TOdn6Hksb1Zb8H5oqsUu0xvS%2BmqvypEghDsNtsQRFr1Nw%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAJh39TOdn6Hksb1Zb8H5oqsUu0xvS%2BmqvypEghDsNtsQRFr1Nw%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 blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfXNkOOG4qWEP51BHj-3VCeE-B%3DoS3yL9Uz9tMypAA-JcQ%40mail.gmail.com.
