IE8 querySelector null vs normal null
问题 I just found really interesting behaviour in ie8. It turns out null is not always null. // just normal, casual null hanging out in the sun var nullA = null; // query for non existing element, should get null, same behaviour also for getElementById var nullB = document.querySelector('asdfasfdf'); // they are equal console.log(nullA === nullB); // false nullA instanceof Object; // will throw 'Object expected' error in ie8. Black magic nullB instanceof Object; Anyone has an explanation for that?