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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 get the name of the button element's first attribute.</p> <button onclick="myFunction()" class="example">Try it</button> <p>In this example, the name of the first attribute is "onclick", and the second is "class".</p> <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 the name of a different attribute.</p> <p id="demo"></p> <script> function myFunction() { var a = document.getElementsByTagName("BUTTON")[0]; var x = a.attributes.item(0).name; document.getElementById("demo").innerHTML = x; } </script> </body> </html>