diff --git a/index.html b/index.html
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+<!doctype html>
+<html>
+<head>
+ <meta charset="UTF-8">
+ <meta name="viewport"
+ content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
+ <title>Cube Demo</title>
+
+ <!-- three.js -->
+ <script src="https://unpkg.com/three@0.126.0/build/three.js"></script>
+</head>
+<body>
+
+<!-- Starting an immersive WebXR session requires user interaction.
+ We start this one with a simple button. -->
+<button onclick="activateXR()">Start Cube Demo</button>
+<script>
+async function activateXR() {
+ // Add a canvas element and initialize a WebGL context that is compatible with WebXR.
+ const canvas = document.createElement("canvas");
+ document.body.appendChild(canvas);
+ const gl = canvas.getContext("webgl", {xrCompatible: true});
+
+ // To be continued in upcoming steps.
+}
+</script>
+</body>
+</html>