Why $(document).append() doesn't work in jQuery 1.9.1?

Question

Why following piece of code doesn't work since jQuery 1.9.1? With previous versions works fine.

$(function () { 
    $(document).append(test);
    document.write('done');
});
var test = {
    version: "1.0",
};

JSFiddle: http://jsfiddle.net/Chessjan/NsjqM/

In JS console it issues error like this:

TypeError: document is null
safeFrag = document.createDocumentFragment(); jquery-1.9.1.js (line 5823)

Edit:

Thanks everybody for quick and extensive aswers. Observed issue was found by accident, and of course, $(document.body).append() is proper approach.

Answer 1

jQuery 1.9.x calls

this[ 0 ].ownerDocument

within its buildFragment() method. Since you pass in the document, the call

document.ownerDocument

will reference to null and cause the error. Any other node will reference the document, which of course, works.

---

Conclusion: Don't call $(document).append() but use $(document.body) for instance.