HTML : Page Preview just before submit

I want to pop-up as page preview in one button click of my current html page. But i want to use only Body Elements of current page & Header Elements from other resources.

My Question is:

Could it possible to edit the header (< head>) ele开发者_开发知识库ments OR just use Header (< head>) elements from other resources. if yes, How ?

What is "other resource"? Other page or what?

To get ONLY the head element or body, you can do it like this:

    // head of the element
    var headElement = document.head;

    // body
    var bodyElement = document.body;

But it only works for current document. I hope I get it right (because I don't really understand what "other resource" mean).

Hope it helps.