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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Support InputEvent.isComposing"
   href="https://bugs.webkit.org/show_bug.cgi?id=170414">170414</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Support InputEvent.isComposing
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>Safari Technology Preview
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </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>HTML Editing
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>chongz&#64;chromium.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>wenson_hsieh&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>According to spec <a href="https://w3c.github.io/uievents/#events-inputevents">https://w3c.github.io/uievents/#events-inputevents</a> InputEvent should have attribute |isComposing| to indicate whether it's inside a composition.

Blink IDL:
<a href="https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/events/InputEvent.idl?q=InputEvent.idl&amp;sq=package:chromium&amp;dr&amp;l=16">https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/events/InputEvent.idl?q=InputEvent.idl&amp;sq=package:chromium&amp;dr&amp;l=16</a></pre>
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      </p>


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