ame="div-user">
      <div>
        <h1><slot name="name" /></h1>
        <p><slot name="age" /></p>
      </div>
    </template>
    <script>
      sb.register();
    </script>

    <!-- user mark applied for deletion -->
    <div-user id="du1" sb-mark="user">
      <span slot="name" sb-mark="user.name"></span>
      <span slot="age" sb-mark="user.age"></span>
    </div-user>
    <script>
      const du1 = document.getElementById('du1');
      const du1div = du1.shadowRoot.lastElementChild;
      test(du1d