I would like to ask a hypothetical question as it relates to HTML, CSS, and JavaScript

I would like to say before I go any further I am not asking for code I am asking for an educated opinion. At the moment I have a fully functioning app which uses a UIWebView to display an HTML document. What I would like to know is would it be possible to use some JavaScript (to preform a search of the text and return results). I am also curious, is the UIWebView that is used in Xcode a cut down ver of Safari? Any help would be great, thanks in advance.