一般来说，如何比较两个DOM或DOM节点？

我正在使用 var win1 = open.window（...）; var win2 = open.window（...）; 在Firefox中打开2个选项卡/窗口 - 现在我想比较两个DOM（文档对象模型）的相似性。
所以我有两个DOM包含非常相似的页面。页面具有相同的HTML但执行不同的JavaScript文件。

I am using var win1 = open.window(...); var win2 = open.window(...); to open 2 tabs/windows in Firefox - now I want to compare the two DOMs (document object models) for similarity. So I have got two DOMs containing a very similar page. The pages have the same HTML but executed different JavaScript files.

一般来说，我检查HTML和CSS是否相同：

In general I check if HTML and CSS is the same:

    var html1 = win1.document.body.innerHTML;
var html2 = win2.document.body.innerHTML;
if (html1 == html2) { ... }
var css1 = win1.document.body.style.cssText
var css2 = win2.document.body.style.cssText
if (css1 == css2) { ... }

但比较所有DOM节点似乎给出不好的结果：

But comparing all DOM nodes seems to give bad results:

var bodyNodes1 = win1.document.body.getElementsByTagName('*');
var bodyNodes2 = win2.document.body.getElementsByTagName('*');

bodyNodes1 [123] .innerHTML isn'必要的类似 bodyNodes2 [123] .innerHTML

bodyNodes1[123].innerHTML isn't neccessary similar bodyNodes2[123].innerHTML

可以使用哪些方法来比较DOM节点？
是否存在用于测试页面的框架/库/脚本的相似性？

Which methods can be used to compare DOM nodes? Do any Framework/Libraries/Scripts exist for testing pages for similarity?

我非常感谢任何提示。 ： - ）

I am very thankful for any hints. :-)