Creating unblockable Pop Up on click

Question

Do not use the JavaScript alert function as this can be blocked by browsers. Instead use a hidden div that you can show when a button is clicked.

First you will have to include the JQuery library in your HTML File by including a link to it in the head. A library is basically a lot of code written for you so that you can invoke complicated functions with less code.

<head>
    <script type="text/javascript"> 
    document.write([ "\<script src='", ("https:" == document.location.protocol) ? "https://" : "http://", "ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js' type='text/javascript'>\<\/script>" ].join('')); 
   </script> <!-- This script tag includes JQuery's functions in you page. -->
</head>

<div style='display:none;'><!--This is the popup box!--></div> 
<script>
$(function(){ 
    $('button').on('click', function(){ //When the button is clicked...
        $('div').css('display', 'block'); //Show the previously hidden div
    });
});
</script>

... as far as I know, there is no way to do it without JavaScript.