/li>
        </ol>
      </section>
      <section>
        <h3>
          Update the overlay area information
        </h3>
        <p>
          To <dfn>update the overlay area information</dfn>, run these steps:
        </p>
        <ol class="algorithm">
          <li>Let |ovls| be a [=list=] of regions defined by the [=overlays=]
          that house the [=window controls=] on the the window frame.
          </li>
          <li>Let |tba| be an empty {{DOMRect}} object representing the
          availab