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What is the PortletBridge Portlet? The PortletBridge Portlet is a JSR 168 compliant portlet that allows a downstream web site to be proxied as a portlet. By default it only displays the content of the BODY but custom XSLT can be used to transform the data from the downstream site. What is the difference between the PortletBridge Portlet and an IFrame There are several differences between using an IFrame and the PortletBridge Portlet. Probably the biggest advantage to using an IFrame is that it is simpler than the PortletBridge Portlet and the downstream site will often be more faithfully rendered. There are however several advantages to using the PortletBridge Portlet.