27611 2009-07-23 11:49:02 -0700 document.__proto__ Behavior 2009-10-24 10:29:40 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) PC OS X 10.5 RESOLVED WONTFIX P2 Normal --- 0 joepeck webkit-unassigned arv eric ggaren keishi oldest_to_newest 134177 0 joepeck 2009-07-23 11:49:02 -0700 Please read the comments on this bug report: https://bugs.webkit.org/show_bug.cgi?id=27169 Note that I'm only concerned with the instanceof. The typeof doesn't seem to be a major issue. Which behavior of instanceof do you think is correct? Summary: WebKit and Chrome: > document.__proto__ instanceof window.Node true > document.__proto__.__proto__.__proto__ === Node.prototype true >typeof document.__proto__ "object" Firefox: > document.__proto__ instanceof window.Node false > document.__proto__.__proto__.__proto__ === Node.prototype true >typeof document.__proto__ "object" Opera: > document.__proto__ instanceof window.Node false > document.__proto__.__proto__.__proto__ === Node.prototype ERROR > typeof document.__proto__ "undefined" 134179 1 keishi 2009-07-23 11:51:01 -0700 Opera doesn7t support __proto__ 134180 2 eric 2009-07-23 11:51:46 -0700 Adding two ECMA experts who would know this off the top of their heads. 134195 3 arv 2009-07-23 12:17:06 -0700 This is once again underspecified behavior. > document.__proto__ instanceof window.Node true This is correct because the [[Prototype]] of document should be a Node > document.__proto__.__proto__.__proto__ === Node.prototype true This is less clear. DOM defines everything in interfaces. But given that we treat an interface as a prototype in other places it seems as correct as we can get it document instanceof HTMLDocument document.__proto__instanceof Document document.__proto__.__proto__ instanceof Node I think this is (or should be) covered by WebIDL. To me it seems WebKit is doing as good as it can. 157453 4 eric 2009-10-24 10:29:40 -0700 Any comments as to why the resolution?