<!DOCTYPE html>
<html>
<body>
<img id="myImg" alt="Flower" src="klematis.jpg" width="150" height="113">
<p>Click the button to see how many attributes the img element have.</p>
<button onclick="myFunction()">Try it</button>
<p>The result should be 5 (the img element's id, alt, src, width and height attributes).</p>
<p><strong>Note:</strong> In Internet Explorer 8 and earlier, the attributes property will return a collection of all <em>possible</em> attributes for the element, and will, in this example, display a much higher number than 5 (possibly 134).</p>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myImg").attributes.length;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>