patched when a load operation commences.</p></td></tr><tr class="indent"><th style="width:25%;"><code>progress</code></th><td><p>Dispatched when data is received as the download
operation progresses.</p></td></tr><tr class="indent"><th style="width:25%;"><code>securityError</code></th><td><p>A load operation attempted to retrieve data from
a server outside the caller's security sandbox.
This may be worked around using a policy file on
the server.</p></td></tr><tr class="indent"><th style="width:25%;"><code>