[Webkit-unassigned] [Bug 169129] New: Can't reliably scroll page whenever mouse cursor inside iframe inside scrollable div with touchpad

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169129

            Bug ID: 169129
           Summary: Can't reliably scroll page whenever mouse cursor
                    inside iframe inside scrollable div with touchpad
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: me at mk9.name

Created attachment 303314
  --> https://bugs.webkit.org/attachment.cgi?id=303314&action=review
Test case

I can't scroll page (with touchpad, mouse works fine) whenever mouse cursor inside iframe in case when iframe inside scrollable div.

Steps to reproduce:

1. Open test-case.html with Safari browser.
2. Try to scroll page with touchpad while cursor within iframe boundaries.

Actual results:

You can scroll page only up.

Expected results:

Page scrolls up and down.

Safari 10.0.1 (12602.2.14.0.7)
macOS Sierra 10.12.1
Macbook Pro 13"

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