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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 - Fallback to legacy type only when event is trusted"
   href="https://bugs.webkit.org/show_bug.cgi?id=168301">168301</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Fallback to legacy type only when event is trusted
          </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>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>Event Handling
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>philip&#64;foolip.org
          </td>
        </tr></table>
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        <pre>When dispatching e.g. an &quot;animationstart&quot; event, WebKit falls back to &quot;webkitanimationstart&quot; if there were no listeners for &quot;animationstart&quot;. This happens in EventTarget::fireEventListeners.

This behavior has made its way into DOM, and was tweaked to only apply to trusted events:
<a href="https://github.com/whatwg/dom/issues/404">https://github.com/whatwg/dom/issues/404</a>
<a href="https://github.com/whatwg/dom/pull/406">https://github.com/whatwg/dom/pull/406</a>
<a href="https://github.com/w3c/web-platform-tests/pull/4687">https://github.com/w3c/web-platform-tests/pull/4687</a></pre>
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