When veiwing the generated html in MVC4 I see this:

<form id="form0" action="/TicketDB/Create" method="post" data-ajax-update="#target" data-ajax-mode="replace" data-ajax="true" data-ajax-method="POST" jQuery17106042114308157038="3" sizcache09730110121886222="0" sizset="0" novalidate="novalidate">

In my MVC3 form I see this. 

<form id="form0" action="/ticketDB/Create" method="post" jQuery1620512913517080009="228" data-ajax-update="#target" data-ajax-mode="replace" data-ajax-method="POST" data-ajax="true">

Why is there a change and how will this effect validation?