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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Backdrop-filter blur rendering issue"
   href="https://bugs.webkit.org/show_bug.cgi?id=147879">147879</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Backdrop-filter blur rendering issue
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>528+ (Nightly build)
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Macintosh
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Mac OS X 10.10
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>CSS
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>haysmathieu&#64;gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=258714" name="attach_258714" title="Gif demonstration of the issue">attachment 258714</a> <a href="attachment.cgi?id=258714&amp;action=edit" title="Gif demonstration of the issue">[details]</a></span>
Gif demonstration of the issue

Hi,

Issue:
The Blur generation catches other windows into the blur generation when used in -webkit-backdrop-filter

How to reproduce:
I made a very simple example : <a href="http://mathieuhays.github.io/Backdrop-filter/">http://mathieuhays.github.io/Backdrop-filter/</a>

Open the inspector on a separate window.
Position it above the blurred part.
Toggle the css property -webkit-backdrop-filter off and on again.
Move the inspector out of the way.
You should see that the inspector window has been included in the blur rendering.</pre>
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