       </p>
        </aside>
        <aside class="note">
          <p>
            If a user agent does not support WCO, the developer can use
            reasonable fallbacks for both the [=manifest/display_override=]
            using [=manifest/display=] and the CSS variables and JS object
            accordingly.
          </p>
        </aside>
      </section>
      <section>
        <h3>
          The <dfn>ongeometrychange</dfn> attribute
        </h3>
        <p>
          The `ongeometrychange` att