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<!DOCTYPE html> <html> <body> <p>Click on "My Button" to display its value attribute.</p> <button id="myBtn" name="myname" value="myvalue" onclick="alert(this.value)">My Button</button> <p>Click on "Try it" to change the value attribute of "My Button".</p> <button onclick="myFunction()">Try it</button> <p><b>Tip:</b> Click on "My Button" before and after you have clicked on "Try it".</p> <script> function myFunction() { document.getElementById("myBtn").value = "newButtonValue"; } </script> </body> </html>