
  <div class="optionsRow">
    <button id="mountButton">Unmount test app</button>
    <div class="optionsRowSpacer">&nbsp;</div>
    <span>
      <a href="/multi.html">multi DevTools</a>
      |
      <a href="/e2e.html">e2e tests</a>
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      <a href="/e2e-regression.html">e2e regression tests</a>
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      <a href="/perf-regression.html">perf regression tests</a>
    </span>

    <label style="margin-left: 4px">
      Layout:
      <select id="layout">
        <option value="leftright">Left/Righ