A true or false entry that depicts whether client-side validation is specified for the elements within the form

First thing of note is that JSF does not have form level declaration for validation.

Secondly, there is no client validation support for the reference implementation of JSF.

Custom implementation is possible, however one must contend with the issue of client identifiers that could be influenced at runtime by naming containers. This could make the location of rendered elements by client scripts quiet a hack. Although not current available with the reference implementation, there are JSF libraries that allow force identifier. This allows the setting of an identifier that would end up as the HTML id attribute, which could be referenced by validation scripts.