{source}
<!-- You can place html anywhere within the source tags -->


<script language="javascript" type="text/javascript">
// You can place JavaScript like this

</script>
<?php
// You can place PHP like this

?><iframe width="100%" height="450" src="https://www.youtube.com/embed/373P8QZHW5M" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
{/source}