title: Can we apply video tags in a site that is HTML4 supported
body: <p>I have a site that is having doctype html4 standard. We need to run videos of your site in ipad and we are willing to put in video tag into it to support video play into ipad. Do we need to change the doctype to html5 will it create problem in existing code. Like in css box model etc. We are supporting ie7 mozilla 3+ and chrome.</p>