// Check if getElementsByTagName("*") returns only elements
support.getElementsByTagName = assert(function( div ) {
	div.appendChild( doc.createComment("") );
	return !div.getElementsByTagName("*").length;
});


function assert( fn ) {
	var div = document.createElement("div");

	try {
		return !!fn( div );
	} catch (e) {
		return false;
	} finally {
		// Remove from its parent by default
		if ( div.parentNode ) {
			div.parentNode.removeChild( div );
		}
		// release memory in IE
		div = null;
	}
}