What language is this? - {"html":"<section class="page">nn

I am helping a friend on his companies website, apparently the person who made it has gone MIA.. Sorry for this simple question and if this isn't the correct forum for this kind of question I apologize. The main index page loads the content into ajax through js when a link is clicked, simple enough. But each index.html page is written in some apparent form of HTML that i am unfamiliar with. Can someone just tell me what this is so i can begin my research? (I have tried to google, but it strips the code so it isn't very useful..) here is a sample of the code {"html":"<section class="page">nn ... "title":"Page 1","next":false,"prev":false,"close":true} Thanks!