cml:hidden
Renders a hidden form input. Accepts all common attributes.
The following CML will output "true" in a column called "secret_sauce" in your generated reports:
<cml:hidden name="secret_sauce" value="true" />
This is best used for submitting additional hidden information, such as the contributor's browser information with the user_agent validator:
<cml:hidden label="contributors_browser" validates="user_agent" />