[Webkit-unassigned] [Bug 155288] New: Compositing layer is too large when inner element has a blur that is within bounds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155288

            Bug ID: 155288
           Summary: Compositing layer is too large when inner element has
                    a blur that is within bounds
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonlee at apple.com

Created attachment 273543
  --> https://bugs.webkit.org/attachment.cgi?id=273543&action=review
Sample test case

See attached test case. The first example has:

<div class="container">
    <div class="particle" style="filter:blur(10px)"></div>
</div>

particle is fixed 80x80, the container is 100x100. The 10px blur should make the particle 100x100 large, but the compositing layer (see web inspector) shows a 136x136 layer.

For example 2, the blur on the container should be 120x120, but it's 156x156 instead.

It's strange in example 3 that the layer is 100x100, but the blur extends past.

I think example 4 is correct?

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