26852 2014-09-19 10:00:15 +0000 [Custom]: Specify preference of localName and typeExtension in createElement 2015-07-06 08:14:11 +0000 1 1 1 Unclassified WebAppsWG HISTORICAL - Component Model unspecified PC All RESOLVED MOVED P2 normal --- 14968 1 deepak.sa dglazkov annevk mike public-webapps wchen public-webapps-bugzilla oldest_to_newest 111787 0 deepak.sa 2014-09-19 10:00:15 +0000 As specified in instantiation of custom elements that "custom tag" will take preference over "type extension", it is required to specify the same in case of createElement(...) . Element createElement(DOMString localName, DOMString typeExtension); Here if localName is also a custom tag, then what will be the prototype of "Element"? Will it be of typeExtension or of localName. Consider the following case: var xA = doc.registerElement("x-a"); var xB = doc.registerElement("x-b"); var customElement = doc.createElement("x-a", "x-b"); What should be the prototype of customElement? AFAIK, this will be the same case as specifying: <x-a is="x-b"></x-a> In this case prototype will be of "x-a". If the above theory is correct, then web-platform-tests/custom-elements/instantiating-custom-elements/extensions-to-document-interface/create-element-interface-type-is-a-type-extension.html test case is wrong. If this issue has been raised earlier, then please provide the link and close this bug. 121723 1 hayato 2015-07-06 08:14:11 +0000 Moved to https://github.com/w3c/webcomponents/issues/167