chrome/browser/resources/connectors_internals/app.html

<style>
  .valid-context #tabs-root,
  .otr #disabled-message {
    display: block;
  }

  .valid-context #disabled-message,
  .otr #tabs-root {
    display: none;
  }
</style>
<div>
  <h1>Enterprise Connectors</h1>
</div>
<div id='main-root'>
  <div id="tabs-root"></div>
  <p id="disabled-message">
    Enterprise Connectors are disabled in off-the-record contexts.
  </p>
</div>