javascript read html comment after closing html tag

Question

I know you shouldn't put anything after the closing 'html' tag. Tell SharePoint about it...

[...]
</body>
</html><!-- Rendered using cache profile:Public Internet (Purely Anonymous) at: 2013-06-06T12:57:10 -->

This is what the SharePoint output caching debug information looks like. I want this hidden comment to be visible on every page. Switching to source view and going to the end of the file makes me tired.

In an effort to not reinvent the wheel I figured it would be the smartest choice to add a piece of javascript code to my masterpage which copies the comment to a location (within the page) of my choosing.

Any idea on how I get hold of the comment via javascript? jquery is ok.

Answer 1

You can get the nodeValue of the Comment Object and append it to Body Element:

$(document).ready(function() {
   var comment = $('html').prop('nextSibling').nodeValue;
   $('<div/>').html(comment).appendTo('body');
});

http://jsbin.com/arodiz/2/edit

Answer 2

Simply document.lastChild.nodeValue will do the trick.

(Assuming you run it after the DOM is ready)

edit

I took the liberty of modifying the code from undefined's answer :)

$(function(){
    $('body').append(document.lastChild.nodeValue);
});

http://jsbin.com/arodiz/3/edit