Bug 651072 - Support HTML parsing in XMLHttpRequest per XMLHttpRequest Level 2 Nightlyに入ったー function getDocument (aURL, aCallback) { var xhr = new XMLHttpRequest; xhr.open("GET", aURL, true); xhr.responseType = "document"; xhr.onreadystatechange = function() { if (xhr.readyState === xhr.DONE /* 4 */ && xhr.status === 200) { aCallback(xhr.response); } }; xhr.send(null); } getDocument("http://www.ex