How can I refresh my webpage in a given interval?

There are 2 ways to define the refresh interval ,  following examples illustrate how to assign a 30 seconds refresh interval : 

1) Assign the duration in SMIL , sample code : 

<seq repeatCount="indefinite">

          <ref src="http://www.YourDomain.com/yourHTML.html" type="text/html" dur="30" />

</seq>

2) Assign the http refresh header in HTML's HEAD section, sample code :

             <meta http-equiv="Refresh" content="30; url=http://www.YourDomain.com/yourHTML.html" />