Is Javascript/jQuery DOM creation safe until it's added to the document?

Question

Please read this statement carefully: let\'s assume before ANY elements are added to the document all unsafe elements in $dom have

Answer 1

It seems that the script will not work as long as it is not appended to DOM.

$(function ()
{
    var ss = document.createElement('script');
    var scr = 'alert("bah");';
    var tt = document.createTextNode(scr);
    ss.appendChild(tt);
    var hh = document.getElementsByTagName('head')[0];
    //hh.appendChild(ss);
});

And

$(function ()
{
    var ss = document.createElement('script');
    var scr = 'alert("bah");';
    var tt = document.createTextNode(scr);
    ss.appendChild(tt);
    var hh = document.getElementsByTagName('head')[0];
    hh.appendChild(ss);
});