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<!DOCTYPE html>
<html>
<head>
<style>
.example {
  color: red;
  padding: 5px;
  width: 150px;
  font-size: 15px;
}
</style>
</head>
<body>
​
<p>Click the button to see how many attributes the button element has:</p>
​
<button onclick="myFunction()" class="example">Try it</button>
​
<p><strong>Note:</strong> In Internet Explorer 8 and earlier, the attributes property will return a collection of all possible attributes for the element, and will, in this example, display a much higher number than 1.</p>
​
<p>The result should be 2 (the button element's onclick and class attribute).</p>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementsByTagName("BUTTON")[0].attributes.length;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_namednodemap_length by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:38 GMT -->
</html>
​
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