Joomla 3x Modal Box

Joomla_modal.php

<?php 
JHTML::_('behavior.modal');

//example 1
<a href="http://www.example.com/images/myimage.jpg" class="modal">Click here to see my image</a>

//example 2
<div id="loadDiv">
  A div element containing some text that you want to display.
</div>
<a href="#loadDiv" class="modal">Click here to load the text in a popup</a>

//options and handlers
//example 3
<a href="http://www.example.com/images/myimage.jpg" 
class="modal" 
rel="{size: {x: 700, y: 300}, closable: false}">
Click here to see my image</a>

//example 4. use iframes
<a href="http://www.example.com/somepage.html" 
class="modal" rel="{size: {x: 700, y: 500}, handler:'iframe'}" 
id="modalLink1">
Click here to see this interesting page</a>

//more information can be find from here
https://www.spiralscripts.co.uk/Joomla-Tips/using-modal-windows-with-joomla.html
?>