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<!DOCTYPE html> <html> <body> <p>Click the button to see how many attributes the button element have.</p> <button id="myBtn" onclick="myFunction()">Try it</button> <p>The result should be 2 (the button element's id and onclick 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 2.</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myBtn").attributes.length; document.getElementById("demo").innerHTML = x; } </script> </body> </html>