I don't think Seam or JSF have anything to do with it. It is just standard xhtml
syntax.
<!-- Comment Here -->
If you are using Facelets as well, you need to add this context parameter to web.xml
<context-param>
<param-name>facelets.SKIP_COMMENTS</param-name>
<param-value>true</param-value>
</context-param>
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