Comment ViewHelper <f:comment>

This ViewHelper prevents rendering of any content inside the tag.

Contents of the comment will still be parsed thus throwing an Exception if it contains syntax errors. You can put child nodes in CDATA tags to avoid this.

Using this ViewHelper won't have a notable effect on performance, especially once the template is parsed. However it can lead to reduced readability. You can use layouts and partials to split a large template into smaller parts. Using self-descriptive names for the partials can make comments redundant.

Before
<f:comment>
    This is completely hidden.
    <f:debug>This does not get rendered</f:debug>
</f:comment>
After

Before
After

<f:comment><![CDATA[
   <f:some.invalid.syntax />
]]></f:comment>