[Webkit-unassigned] [Bug 164016] New: Consider making document-level touchstart/touchmove listeners passive by default

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164016

            Bug ID: 164016
           Summary: Consider making document-level touchstart/touchmove
                    listeners passive by default
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rbyers at chromium.org

Chrome is planning on shipping a breaking change (https://github.com/WICG/interventions/issues/35) to make document-level (window,document,body) touchstart and touchmove listeners passive by default.  We've seen huge scroll performance improvements (~40% overall reduction in 99th percentile scroll start time) and relatively little breakage from this.

If we can succeed in moving most remaining websites to adopt touch-action (a very simple fix) and therefore show that such a change is entirely web compatible, is this change something the WebKit project would consider?  Or is there any reason (other than web compat concerns) why it would be a bad idea for WebKit?

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