chrome/browser/resources/sync_internals/notifications.html

<script src="chrome://sync-internals/notifications.js"></script>

<style>
table#notificationInfo tr:nth-child(odd) {
  background: #eff3ff;
}
</style>

<p id='notificationStateInfo'>
  State: <span jscontent='notificationState'></span>
</p>
<table id='notificationInfo'>
  <tr>
    <th>Type</th>
    <th>Total count</th>
    <th>Session count</th>
    <th>Payload</th>
  </tr>
  <tr jsselect='notifications'>
    <td jscontent='type'></td>
    <td jscontent='totalCount'></td>
    <td jscontent='sessionCount'></td>
    <td jscontent='payload'></td>
  </tr>
</table>