exports.inDoc = function (node) {
    var adown = doc.nodeType === 9 ? doc.documentElement : doc,
        bup = node && node.parentNode;
    return doc === bup || !!( bup && bup.nodeType === 1 && (
        adown.contains ?
            adown.contains( bup ) :
            doc.compareDocumentPosition && doc.compareDocumentPosition( bup ) & 16
        ));
}

exports.inDoc = function (node) {
    if ( node ) {
        while ( (node = node.parentNode) ) {
            if ( node === doc ) {
                return true;
            }
        }
    }
    return false;
}