[Webkit-unassigned] [Bug 226354] New: VisualViewport fires lots scroll events for 0.5px offsets when scrolling on Retina iOS device

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226354

            Bug ID: 226354
           Summary: VisualViewport fires lots scroll events for 0.5px
                    offsets when scrolling on Retina iOS device
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Created attachment 429921

  --> https://bugs.webkit.org/attachment.cgi?id=429921&action=review

Testcase

When not zoomed, we should not be firing scroll events on the VisualViewport. However, we do, because of some 0.5px difference between the layout viewport and visual viewport, probably due to rounding. See testcase, test on iPad.

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