you should design your website to still be functional even if Javascript is disabled True, but irrelevant to the issue of "can you do X on the client side with

you should design your website to still be functional even if Javascript is disabled True, but irrelevant to the issue of "can you do X on the client side without Javascript?". I can imagine a Javascript form validator that somehow makes the form unusable with Javascript turned off, but I've sure never seen one. And server-side validation is website 101 stuff that you should always be doing regardless of the front-end technology, not a counter to the many good uses of front-end validation.