<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
#menuCollapsed{
width: 100%;
padding: 50px 0;
text-align: center;
background-color: lightblue;
margin-top: 20px;
}
#menuopen {
display:none;
}
</style>
</head>
<body>
<p>Click the "Try it" button to toggle between hiding and showing the DIV element:</p>
<button onclick="menuAction()">Try it</button>
<div id="menucollapsed">
This is my DIV element.
</div>
<div id="menuopen" >
This is my DIV elemsssent.
</div>
<p><b>Note:</b> The element will not take up any space when the display property
is set to "none".</p>
</body>
</html>
