Javascript: Get current page CURRENT source

I have HTML and I need to get page source of this html.

document.documentElement.outerHTML

or

$.ajax({
async: true,
type: 'GET',
cache: false,
url: window.location.href,
success: function(data) {
   alert(data);
}
});

is working, but they display originally source. If I change html (by jQuery, for example), they don't read my changes.

Is it possible read CURRENT source of page?