Ex9.html

<!DOCTYPE html>
<html>

<head>
    <title>Ex9</title>
</head>
<style type="text/css">
#htmltxt,
#csstxt {
    display: none;
}
</style>

<body>
    <button id="html">HTML</button>
    <button id="css">CSS</button>
    <p id="htmltxt">This is HTLM
        <p id="csstxt">This is CSS</p>
        <script src="JQuery/jquery-3.5.1.min.js"></script>
        <script>
        $(document).ready(function() {
            $("#html").click(function() {
                $("#htmltxt").toggle();
            });
            $("#css").click(function() {
                $("#csstxt").toggle();
            });
        });
        </script>
        <style>
        </body></html>