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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Uncaught Exception: SecurityError: DOM Exception 18: An attempt was made to break through the security policy of the user agent."
   href="https://bugs.webkit.org/show_bug.cgi?id=154448">154448</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Uncaught Exception: SecurityError: DOM Exception 18: An attempt was made to break through the security policy of the user agent.
          </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>Web Inspector
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>hhartz&#64;gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>bburg&#64;apple.com, graouts&#64;webkit.org, joepeck&#64;webkit.org, mattbaker&#64;apple.com, nvasilyev&#64;apple.com, timothy&#64;apple.com, webkit-bug-importer&#64;group.apple.com
          </td>
        </tr></table>
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        <div>
        <pre>-------
Auto-generated details:

Inspected URL:        (unknown)
Loading completed:    false
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/602.1.20+ (KHTML, like Gecko)
Uncaught exceptions:
 - SecurityError: DOM Exception 18: An attempt was made to break through the security policy of the user agent. (at Setting.js:61:44)
 - ReferenceError: Can't find variable: InspectorBackend (at InspectorBackendCommands.js:32:17)
 - ReferenceError: Can't find variable: InspectorBackend (at Main.js:59:25)
-------

* STEPS TO REPRODUCE
1. What were you doing? Include setup or other preparations to reproduce the exception.
   - debugging a web view
2. Include explicit, accurate, and minimal steps taken. Do not include extraneous or irrelevant steps.
   - load a WKWebView instance in iOS simulator
   - use menu &quot;Develop&quot; -&gt; &quot;Simulator&quot; -&gt; &quot;about: blank&quot; (same result if the WKWebView has loaded content

* NOTES
Document any additional information that might be useful in resolving the problem, such as screen shots or other included attachments.</pre>
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