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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> </html>