v>
      <span>Elements without test attribute</span>
      <div id="notTestContainer" style="color: white; background-color: green; min-height: 1em;">
        <slot id="notTestContent"></slot>
      </div>
      <span>Elements with test attribute</span>
      <div style="color: white; background-color: red; min-height: 1em;">
        <div id="testContainer">
          <slot id="testContent" name="test"></slot>
        </div>
      </div>
    </div>
  </template>
</dom-module>

<script type="module">
import