[Webkit-unassigned] [Bug 171099] New: Consider implementing scroll anchoring

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=171099

            Bug ID: 171099
           Summary: Consider implementing scroll anchoring
           Product: WebKit
           Version: Safari 10
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rbyers at chromium.org
                CC: cdumez at apple.com

Scroll anchoring is a feature designed to avoid unintended jumps of the content while (or even after) a page is loading - keeping what the user is looking at in view. It relies on some heuristics to avoid web compat issues, but includes an explicit opt-out API (overflow-anchor CSS property) for sites designed not to need it.  It took quite a bit of iteration to get the web compat right, but it's now been shipping since Chrome 56 without issue, so we're convinced it has stuck. We're seeing about 11% of page views on Android trigger anchoring logic at least once, and about 6% on desktop.

Summary / video: https://blog.chromium.org/2017/04/scroll-anchoring-for-web-developers.html
Explainer: https://github.com/WICG/ScrollAnchoring/blob/master/explainer.md
Draft spec: https://wicg.github.io/ScrollAnchoring
CSSWG discussion: https://github.com/w3c/csswg-drafts/issues/676
Blink implementation: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp

Feel free to file issues (https://github.com/WICG/ScrollAnchoring/issues) for any concerns, questions or suggestions.  Let us know if you think you might implement and we'll try to get some web-platform-tests upstreamed (https://github.com/WICG/ScrollAnchoring/issues/3)

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