Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("p").mouseenter(function(){
        $("p").css("background-color", "yellow");
    });
    $("p").mouseleave(function(){
        $("p").css("background-color", "lightgray");
    });
    $("#btn1").click(function(){
        $("p").mouseenter();
    });  
    $("#btn2").click(function(){
        $("p").mouseleave();
    }); 
});
</script>
</head>
<body>

<p>This is a paragraph.</p>

<button id="btn1">Trigger mouseenter event</button><br>
<button id="btn2">Trigger mouseleave event</button>

</body>
</html>