is html5 input 'required' a secure validation technique?

i have a lot of trouble asking questions properly on this site, so here goes: I am concerned about web security and the use of the HTML5 required word on input tags. I am trying to use it as part of 'form input validation'. Is the use of the HTML5 'required' on input tags something that is reliable for validation or is it easily manipulated by a user trying to bypass the input field requirement. please be nice if you try to answer. I did search for information on html security on this and found little on this word. thanks