Calculate total number of nodes in your web page.

count_dom_nodes.js

var countNodes = function() {
    var total = 1;
    var count = function(node) {
        var i, l;
        l = node.children.length;
        total += l;
        for(i=0; i<l; i++) {
            count(node.children[i])
        }
    }
    count(document.body);
    return total;
}