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[Bug 20487] New: [Custom]: Creation of custom elements via createElement is underdefined

From: <bugzilla@jessica.w3.org>
Date: Sat, 22 Dec 2012 00:01:03 +0000
To: public-webapps-bugzilla@w3.org
Message-ID: <bug-20487-2532@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=20487

            Bug ID: 20487
           Summary: [Custom]: Creation of custom elements via
                    createElement is underdefined
    Classification: Unclassified
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Component Model
          Assignee: dglazkov@chromium.org
          Reporter: bzbarsky@mit.edu
        QA Contact: public-webapps-bugzilla@w3.org
                CC: wchen@mozilla.com
            Blocks: 14968

Consider this script:


  var proto = { myProp: 1 };
  proto.__proto__ = HTMLElement.prototype;
  var fun = document.register("x-foo", { prototype: obj });

  var elem1 = document.createElement("x-foo");
  var elem2 = document.createElement("X-FOO");
  var elem3 = document.createElementNS(null, "x-foo");
  var elem4 = document.createElementNS(null, "X-FOO");
  var elem5 = document.createElementNS("http://www.w3.org/1999/xhtml",
"x-foo");
  var elem6 = document.createElementNS("http://www.w3.org/1999/xhtml",
"X-FOO");

as far as I can tell, the specification does not define which of those
elements, if any, have "proto" as their proto, nor whether it depends on
whether "document" is an HTML document or an XML/XHTML document.

This is not a hypothetical problem: we just had two implementors who were
trying to guess what the spec might maybe mean here write two different
incompatible implementations.

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