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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Web Inspector: Option-Up doesn't increment certain attribute values"
   href="https://bugs.webkit.org/show_bug.cgi?id=149257">149257</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Web Inspector: Option-Up doesn't increment certain attribute values
          </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>nvasilyev&#64;apple.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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        <pre>Created <span class=""><a href="attachment.cgi?id=261386" name="attach_261386" title="[Animated GIF] Bug">attachment 261386</a> <a href="attachment.cgi?id=261386&amp;action=edit" title="[Animated GIF] Bug">[details]</a></span>
[Animated GIF] Bug

Steps:
1. Go to <a href="http://n12v.dev/2-way-data-binding/">http://n12v.dev/2-way-data-binding/</a>
2. Inspect the first video, &lt;video width=&quot;216&quot; height=&quot;48&quot; poster=&quot;/2-way-data-binding/temperature-converter.png&quot;&gt;
3. Double click on &quot;216&quot;
4. Press Option-Up

Expected:
Value changes to &quot;217&quot;, cursor stays where it was.

Actual:
Value changes to &quot;217&quot;, cursor stays jumps to the beginning of the text field.

An error is thrown:

    IndexSizeError: DOM Exception 1: Index or size was negative, or greater than the allowed value.
      setEnd - EditingSupport.js:267
      handleEditingResult - EditingSupport.js:267
      keyDownEventListener - EditingSupport.js:289

Note that modifying height on the very same element works as expected. Although, it causes the DOM path bar to blink.</pre>
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