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<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body, html, main {
margin: 0;
width: 100%;
height: 100%;
}
section {
display: inline-block;
}
</style>
<script>
addEventListener("load", () => {
const outerShadowRoot = document.querySelector("main").attachShadow({ mode: "open" });
outerShadowRoot.innerHTML = `
<style>
section {
width: 400px;
height: 600px;
border: 2px solid black;
}
</style>
<section></section>`;
const innerShadowRoot = outerShadowRoot.querySelector("section").attachShadow({ mode: "open" });
innerShadowRoot.innerHTML = `
<style>
div {
width: 400px;
height: 200px;
box-sizing: border-box;
}
.red { background-color: rgb(255, 59, 48); }
.green { background-color: rgb(52, 199, 89); }
.blue { background-color: rgb(0, 122, 255); }
</style>
<div class="red"></div>
<div class="green"></div>
<div class="blue"></div>`;
});
</script>
</head>
<body>
<main></main>
</body>
</html>
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