[Webkit-unassigned] [Bug 151015] New: Sometimes unable to scroll fixed div when the body is scrollable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151015

            Bug ID: 151015
           Summary: Sometimes unable to scroll fixed div when the body is
                    scrollable
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wenson_hsieh at apple.com

Created attachment 265034
  --> https://bugs.webkit.org/attachment.cgi?id=265034&action=review
Try scrolling the page and then the sidebar

When a page contains a scrollable fixed div and the page is scrolled, the hit-region of the fixed div does not appear to scroll with the page, so attempts to scroll the fixed div will instead scroll the page.

This is easily observed in the following websites:

https://docs.angularjs.org/api
http://underscorejs.org
https://developer.apple.com/library/safari/documentation/AppleApplications/Reference/SafariWebContent/Introduction/Introduction.html

as well as the attached test case, where scrolling the page and then hovering over the sidebar and attempting to scroll it will instead cause the page to scroll again.

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