uctor() {
            super();
            let template = document.getElementById("my-radio");
            let templateContent = template.content;

            const shadowRoot = this.attachShadow({ mode: "open" }).appendChild(
              templateContent.cloneNode(true)
            );
          }
        }
      );
    </script>
  </head>

  <body>
    <main>
      <h1>Test page</h1>
      <my-radio>Test radio 1</my-radio>
      <my-radio>Test radio 2</my-radio>
    </main>
    <script>
      UnitTest = 