[Webkit-unassigned] [Bug 173841] New: getBoundingClientRect returns wrong value for combination of page zoom and scroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173841

            Bug ID: 173841
           Summary: getBoundingClientRect returns wrong value for
                    combination of page zoom and scroll
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ajuma at chromium.org
                CC: cdumez at apple.com, simon.fraser at apple.com

Created attachment 313852

  --> https://bugs.webkit.org/attachment.cgi?id=313852&action=review

Test page

See the attached test case. Increase page zoom (using Cmd-+) and then scroll down. While the blue div is still entirely visible, it gets a bounding client rect whose origin has a negative y coordinate.

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