fication defines the <dfn>Navigator</dfn> interface,
        which this specification extends:
      </p>
      <pre class="idl">
        [SecureContext, Exposed=(Window)]
        partial interface Navigator {
          [SameObject] readonly attribute WindowControlsOverlay windowControlsOverlay;
        };
      </pre>
    </section>
    <section>
      <h2>
        Extensions to the `Window` interface
      </h2>
      <section>
        <h3>
          Internal slots
        </h3>
        <table class="simp