155293 2016-03-10 02:16:58 -0800 WebKit returns "object" for "typeof XMLHttpRequest" and "typeof WebSocket" which are clearly constructable. 2016-03-10 08:48:30 -0800 1 1 1 Unclassified WebKit DOM WebKit Local Build Unspecified Unspecified RESOLVED DUPLICATE 154038 P2 Normal --- 1 mark.toller webkit-unassigned ap cdumez j.isorce oldest_to_newest 1173035 0 mark.toller 2016-03-10 02:16:58 -0800 typeof WebSocket and XMLHttpRequest is "function" in IE, Firefox and Chrome, WebKit returns "object" here. 1173100 1 cdumez 2016-03-10 08:48:01 -0800 Already fixed in Bug 154038. Note however that this has nothing to do with being constructible or not. `typeof Node` returns "function" in all browsers as well but is not constructible. *** This bug has been marked as a duplicate of bug 154038 *** 1173102 2 cdumez 2016-03-10 08:48:30 -0800 You can confirm this by trying a nightly build: https://nightly.webkit.org