The <ui:remove> tag is used for removing the content. This tag is rarely used, but a perfect example of this is removing comments of type <!-- -->. You probably thought of something like the following line:

<!-- <h:outputText value="I am a comment!"/> -->

It doesn't have any side effects on the HTML rendered code. Well, that isn't true, because in the HTML source code, you will see something similar to the following screenshot:

But if we encapsulate this in <ui:remove>, then the preceding client side effect will not be produced anymore, which has the following code.

<ui:remove>
  <!-- <h:outputText value="I am a comment!"/> -->
</ui:remove>

The same effect will have the following code:

<ui:remove>
  <h:outputText value="I am a comment!"/>
</ui:remove>

In order to remove comments from the generated HTML code, you add the context parameter in web.xml, as shown in the following code...