[Webkit-unassigned] [Bug 151926] New: Block formatting context (overflow:hidden) doesn't clear float if two clear:both divs at end of container in between

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151926

            Bug ID: 151926
           Summary: Block formatting context (overflow:hidden) doesn't
                    clear float if two clear:both divs at end of container
                    in between
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at chrisrebert.com

Created attachment 266740
  --> https://bugs.webkit.org/attachment.cgi?id=266740&action=review
Screenshot of incorrect rendering in WebKit Nightly

Steps to reproduce:
1. Open https://bugzilla.mozilla.org/attachment.cgi?id=8665202 in WebKit Nightly

Expected results:
The yellow box should be entirely below (with respect to the Y axis) the blue floating box.
See Chrome Canary screenshot.
IE11 and Firefox Nightly also behave like Chrome Canary.

Actual results:
The blue floating box is entirely within the yellow box.
See WebKit Nightly screenshot.

Analogous Chrome bug: https://code.google.com/p/chromium/issues/detail?id=535381

Originally discovered in: https://bugzilla.mozilla.org/show_bug.cgi?id=1196255

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