HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>Shadow DOM API</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}my-element{display:block;padding:.75rem 1rem;border:1px dashed #93c5fd;border-radius:8px;background:#fff;max-width:420px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Modern Shadow DOM</h1>

  <my-element></my-element>



  <script>class MyElement extends HTMLElement{constructor(){super();this.attachShadow({mode:"open"}).innerHTML="\n\n          <style>\n\n            p { color: #dc2626; margin: 0; font-size: 0.9375rem; }\n\n          </style>\n\n          <p>This is shadow DOM content.</p>\n\n        "}}customElements.define("my-element",MyElement)</script>

  <p class=hint>attachShadow() is the standard way to encapsulate styles and markup in Web Components.</p>

</body>

</html>

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HTML shadow Tag — Modern Shadow DOM API Alternative