Multiple Browser Support in Webcenter

Question

What are the code changes that are to be made to have Multiple browser support in Webcenter?
what is done in Webcenter to provide to browser independent UI
e,g in jsp , we usually write javascript
if browser is this, do this
else do this
kind of logic

Answer 1

Even When I use JSTL and have modified the code to the following
<?xml version='1.0' encoding='UTF-8'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:fn="http://java.sun.com/jsp/jstl/functions"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
<jsp:directive.page contentType="text/html;charset=UTF-8"/>
<f:view>
<af:document id="d1">
<af:form id="f1">
<c:choose>
<c:when test="${fn:containsIgnoreCase(header('User-Agent'), 'MSIE 6.0')}">
<c:out value="Its IE6"/>
</c:when>
<c:otherwise>
<c:out value="Its others"/>
</c:otherwise>
</c:choose>
</af:form>
</af:document>
</f:view>
</jsp:root>
i get error on compile that says
Error(12,16): The function "header" for prefix "" can not be found in the specified tag library.