[Webkit-unassigned] [Bug 148033] New: Scrollbar doesn't show up in a container with position:fixed

Fri Aug 14 12:29:09 PDT 2015

https://bugs.webkit.org/show_bug.cgi?id=148033

            Bug ID: 148033
           Summary: Scrollbar doesn't show up in a container with
                    position:fixed
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Mac OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: egarciad at google.com

Created attachment 259025
  --> https://bugs.webkit.org/attachment.cgi?id=259025&action=review
try to scroll the content inside the red box.

A simple example can repro this issue:

<body>
  <div id="#red" style="position: fixed; width: 200px; height: 200px; top: 0px; left: 0; background-color:red; overflow-y: auto;">
      <div style="height: 3000px; width: 10px; background: green; margin: 10px;"></div>
  </div>
</body>

the scrollbar in #red doesn't render anymore, but if I change its position to absolute, then the scrollbar is back.

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