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<!DOCTYPE html> <html> <body> <img id="myImg" src="/demo/images/compman.gif" alt="Crazy computerman" width="107" height="98"> <p>Click the button to change the alternate text of the image.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myImg").alt = "newAlternateText"; document.getElementById("demo").innerHTML = "The value of the alt attribute was changed from ''Crazy computerman'' to ''newAlternateText''"; } </script> </body> </html>