Function isDOMNode

test/helpers/sinon.js:631–648

(obj)

    var hasOwn = Object.prototype.hasOwnProperty;

    function isDOMNode(obj) {
        var success = false;

        try {
            obj.appendChild(div);
            success = div.parentNode == obj;
        } catch (e) {
            return false;
        } finally {
            try {
                obj.removeChild(div);
            } catch (e) {
                // Remove failed, not much we can do about that
            }
        }

        return success;
    }

    function isElement(obj) {
        return div && obj && obj.nodeType === 1 && isDOMNode(obj);