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