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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 - SVG external media doesn't accept Blob URIs"
   href="https://bugs.webkit.org/show_bug.cgi?id=148372">148372</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>SVG external media doesn't accept Blob URIs
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </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>SVG
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>patket&#64;microsoft.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>zimmermann&#64;kde.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=259745" name="attach_259745" title="test page">attachment 259745</a> <a href="attachment.cgi?id=259745&amp;action=edit" title="test page">[details]</a></span>
test page

Safari does not allow for you to use a blob uri as a source for external media (e.g. use's xhlink:href). This is useful for clientside created assets, as well as as a feature test to detect SVG external media support.
It seems to be attempting to request it from the network as it shows as a 404 error in the network tab. 


All other browsers that support the file blobs and createObjectURL are able to do this.

I have attached a test page showing the issue.</pre>
        </div>
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