<html>
<script>
async function toggleFullscreen() {
if (!document.fullscreenElement) {
await document.documentElement.requestFullscreen();
await screen.orientation.lock("landscape-primary");
} else {
document.exitFullscreen();
}
}
</script>
<body style="height:5000px" onclick="toggleFullscreen();">
<p>A page that will rotate on touch.</p>
</body>
</html>