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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Multitouch Test</title>
</head>
<body>
<div style="width:80%; height: 200px; border: 1px solid black; font-size: 5em;" id="box">
</div>
Touch inside the box. On a touch enabled browser, you will get the number
of detected touch events. If the box is red, your browser does not support
touch events.
<script>
var box = document.getElementById("box");
box.addEventListener("touchstart", function(evt) {
box.innerHTML = evt.touches.length;
evt.preventDefault();
});
box.addEventListener("touchmove", function(evt) {
box.innerHTML = evt.touches.length;
evt.preventDefault();
});
if (!(typeof box.ontouchstart != 'undefined')) {
box.style.backgroundColor = "red";
}
</script>
</body>
</html>
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