27260 2014-11-06 17:18:44 +0000 [Custom]: Need to define global/Realm handling for registerElement 2015-07-06 08:13:35 +0000 1 1 1 Unclassified WebAppsWG HISTORICAL - Component Model unspecified PC All RESOLVED MOVED P2 normal --- 14968 1 bzbarsky dglazkov mike public-webapps public-webapps-bugzilla oldest_to_newest 114609 0 1535 bzbarsky 2014-11-06 17:18:44 +0000 Created attachment 1535 Testcase Consider this testcase: <iframe></iframe> <script> var f = document.registerElement.call(frames[0].document, "x-foo"); </script> Per the spec, this should "let PROTOTYPE be the result of invoking Object.create with HTMLElement's interface prototype object as only argument". But it doesn't say _which_ "HTMLElement's interface prototype object" should be used. Then the spec says to run the "custom element constructor generation algorithm", but this algorithm assumes an ambient global, which the spec doesn't define. In practice, the Chrome and Firefox implementations differ, as the attached testcase shows. The output in Chrome: ctor instanceof iframe Function: false ctor instanceof parent Function: true proto comes from iframe: false proto comes from parent: true The output in Firefox: ctor instanceof iframe Function: true ctor instanceof parent Function: false proto comes from iframe: true proto comes from parent: false I believe the Firefox behavior is more correct here, by the way, since we're supposed to be using the registry of the iframe document, so should use its prototypes and constructors. 114610 1 bzbarsky 2014-11-06 17:26:09 +0000 Oh, and also, the "definition construction algorithm" is making assumptions about which global's prototypes or interfaces are supposed to be used. This part is also not interoperable in Chrome and Firefox: Firefox seems to require that the passed-in proto come from the same global as the document involved, as you can see in the testcase. 121718 2 hayato 2015-07-06 08:13:35 +0000 Moved to https://github.com/w3c/webcomponents/issues/185 1535 2014-11-06 17:18:44 +0000 2014-11-06 17:18:44 +0000 Testcase baz.html text/html 1169 bzbarsky PGlmcmFtZT48L2lmcmFtZT4KPHByZT48c2NyaXB0PgogIHZhciBmID0gZG9jdW1lbnQucmVnaXN0 ZXJFbGVtZW50LmNhbGwoZnJhbWVzWzBdLmRvY3VtZW50LCAieC1mb28iKTsKICBkb2N1bWVudC53 cml0ZWxuKCJjdG9yIGluc3RhbmNlb2YgaWZyYW1lIEZ1bmN0aW9uOiAiICsgKGYgaW5zdGFuY2Vv ZiBmcmFtZXNbMF0uRnVuY3Rpb24pKTsKICBkb2N1bWVudC53cml0ZWxuKCJjdG9yIGluc3RhbmNl b2YgcGFyZW50IEZ1bmN0aW9uOiAiICsgKGYgaW5zdGFuY2VvZiBGdW5jdGlvbikpOwogIHZhciBv YmogPSBuZXcgZigpOwogIGRvY3VtZW50LndyaXRlbG4oCiAgICAicHJvdG8gY29tZXMgZnJvbSBp ZnJhbWU6ICIgKwogICAgKE9iamVjdC5nZXRQcm90b3R5cGVPZihPYmplY3QuZ2V0UHJvdG90eXBl T2Yob2JqKSkgPT0gZnJhbWVzWzBdLkhUTUxFbGVtZW50LnByb3RvdHlwZSkpOwogIGRvY3VtZW50 LndyaXRlbG4oCiAgICAicHJvdG8gY29tZXMgZnJvbSBwYXJlbnQ6ICIgKwogICAgKE9iamVjdC5n ZXRQcm90b3R5cGVPZihPYmplY3QuZ2V0UHJvdG90eXBlT2Yob2JqKSkgPT0gSFRNTEVsZW1lbnQu cHJvdG90eXBlKSk7CiAgdmFyIHByb3RvID0gT2JqZWN0LmNyZWF0ZShIVE1MRWxlbWVudC5wcm90 b3R5cGUpOwogIHZhciBnID0gZG9jdW1lbnQucmVnaXN0ZXJFbGVtZW50LmNhbGwoZnJhbWVzWzBd LmRvY3VtZW50LCAieC1iYXIiLCB7IHByb3RvdHlwZTogcHJvdG8gfSk7CiAgdmFyIGVsZW0xID0g ZG9jdW1lbnQuY3JlYXRlRWxlbWVudCgieC1iYXIiKTsKICB2YXIgZWxlbTIgPSBmcmFtZXNbMF0u ZG9jdW1lbnQuY3JlYXRlRWxlbWVudCgieC1iYXIiKTsKICBkb2N1bWVudC53cml0ZWxuKAogICAg ImlmcmFtZSByZWdpc3RyeSB1c2VkOiAiICsKICAgIChPYmplY3QuZ2V0UHJvdG90eXBlT2YoZWxl bTEpID09IEhUTUxFbGVtZW50LnByb3RvdHlwZSAmJgogICAgIE9iamVjdC5nZXRQcm90b3R5cGVP ZihlbGVtMikgPT0gcHJvdG8pKTsKICBkb2N1bWVudC53cml0ZWxuKAogICAgInBhcmVudCByZWdp c3RyeSB1c2VkOiAiICsKICAgIChPYmplY3QuZ2V0UHJvdG90eXBlT2YoZWxlbTEpID09IHByb3Rv ICYmCiAgICAgT2JqZWN0LmdldFByb3RvdHlwZU9mKGVsZW0yKSA9PSBmcmFtZXNbMF0uSFRNTEVs ZW1lbnQucHJvdG90eXBlKSk7Cjwvc2NyaXB0Pgo=