<p>What is iPhone's browser tag and how iPhone optimized web site is different from a usual mobile web site?</p>

<p>Thanks!</p>

Nettuts has a great introduction to web-developement for iPhone. You find it
here
This is the specific code you asked for (taken from that article):
```
```
<!--#if expr="(${HTTP_USER_AGENT} = /iPhone/)"-->   

<!--  
place iPhone code in here  
-->   

<!--#else -->   

<!--  
    place standard code to be used by non iphone browser.   
-->   
<!--#endif -->
```
```