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<!DOCTYPE html> <html> <body> <p>This example uses the HTML DOM to assign an "onmouseover" and "onmouseout" event to a h1 element.</p> <h1 id="demo">Mouse over me</h1> <script> document.getElementById("demo").onmouseover = function() {mouseOver()}; document.getElementById("demo").onmouseout = function() {mouseOut()}; function mouseOver() { document.getElementById("demo").style.color = "red"; } function mouseOut() { document.getElementById("demo").style.color = "black"; } </script> </body> </html>