<head>
<style>
.shadow-box {
padding: 10px;
border: 1px solid #000;
background-color: lightcoral;
color: white;
}
</style>
</head>
<body>
<div class="shadow-box">This is styled by the main document</div>
<div id="host"></div>
<script>
// Create a shadow root
const hostElement = document.getElementById('host');
const shadowRoot = hostElement.attachShadow({ mode: 'open' });
// Attach shadow DOM content
shadowRoot.innerHTML = `
<style>
.shadow-box {
padding: 10px;
border: 1px solid #000;
background-color: lightblue;
color: black;
}
</style>
<div class="shadow-box">Hello, Shadow DOM!</div>
`;
</script>
</body>