111476 2013-03-05 13:22:17 -0800 Getting the descriptor selectionDirection throws error 2016-04-12 03:30:55 -0700 1 1 1 Unclassified WebKit DOM 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 49739 1 arv webkit-unassigned cdumez haraken oliver rniwa zcorpan oldest_to_newest 847999 0 arv 2013-03-05 13:22:17 -0800 var checkbox = document.createElement('input'); input.type = 'checkbox'; Object.getOwnPropertyDescriptor(input, 'selectionDirection'); // THROWS! It is OK to throw when we try to get the value of the selectionDirection but is an ES5 spec violation to throw on getting the descriptor. This is most likely because we report WebIDL attributes as data properties, and as such, we read the value of the property. 1181220 1 zcorpan 2016-04-06 03:33:55 -0700 Proposed spec change to not throw on getting: https://github.com/whatwg/html/pull/1006 1182015 2 cdumez 2016-04-07 19:40:35 -0700 This is apparently fixed on WebKit trunk: var input = document.createElement('input'); input.type = 'checkbox'; Object.getOwnPropertyDescriptor(input, 'selectionDirection'); -> returns undefined Object.getOwnPropertyDescriptor(input.__proto__, 'selectionDirection'); -> returns {get: function, set: function, enumerable: true, configurable: true} Feel free to reopen if I missed something. 1182016 3 cdumez 2016-04-07 19:42:45 -0700 (In reply to comment #1) > Proposed spec change to not throw on getting: > https://github.com/whatwg/html/pull/1006 Oh, this does not seem strictly related to this bug. While WebKit no longer throws on getting the descriptor, accessing input.selectionDirection will throws. 1183031 4 zcorpan 2016-04-12 03:30:55 -0700 Right, filed https://bugs.webkit.org/show_bug.cgi?id=156500