pruebasWebShadow/index.html at main · zAlfok/pruebasWebShadow · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
   class ContainerComponent extends HTMLElement {
  constructor() {
    super();

    const containerTemplate = document.createElement("template");
    containerTemplate.innerHTML = `
       <slot>This is a slot created tag</slot>
       <div>
         <div><span>This is what I want</span></div>
       </div>
    `;

    const shadowRoot = this.attachShadow({ mode: "open" });
    shadowRoot.appendChild(containerTemplate.content.cloneNode(true));
  }
}

customElements.define("layout-container", ContainerComponent);
  </script>

  <layout-container>
  </layout-container>
</body>
</html>