Link to test: http://theshock.github.com/trash/jquery-input-bug/index.html

// Error:
Uncaught TypeError: Object #<Object> has no method 'createDocumentFragment'

// Here:
    if ( !fragment ) {
        fragment = doc.createDocumentFragment(); // <====
        jQuery.clean( args, doc, fragment, scripts );
    }

Test code:

$(function() {
	// success:
	$('<div />', {});
	$('<input>', { 'class': 'test' });
	$('<input type="hidden" />').attr({ 'class': '123' });

	// fail:
	$('<input type="hidden" />', { 'class': 'test' });
	$('<input type="hidden" />', {});