Element constructor produces incorrect is attribute and doesn't call attachedCallback in Firefox

[rconnamacher]

Creating elements by constructor incorrectly produces an is attribute and doesn't call attachedCallback in Firefox. (It works correctly in Safari, and I didn't test IE.)

var ctor = document.registerElement("my-element", {});
new ctor();

produces <my-element></my-element> in Safari, but <my element is="false"></my-element> in Firefox. After some digging, this is because the constructor returned by document.registerElement calls document.createElement("my-element", false) in Firefox, and that false argument is then stringified into the is attribute.

More seriously, the bad is attribute causes attachedCallback to never fire.

Tested in document-register-element 4.0 and Firefox 37-38. (I checked the tests, and there don't appear to be any unit tests covering constructors or attachedCallback.)

[WebReflection]

I cannot reproduce this on platforms that use this polyfill ... are you sure that's not rather a Firefox bug?

What you are doing is tested all over here: http://webreflection.github.io/document-register-element/test/

plus you are creating an element without any prototype, which attribute/attached should fire?

I need an exact test case to move on, the one you provided is already tested and AFAICT no browser add is attribute as false anywhere.

[WebReflection]

actually ... never mind, I can reproduce indeed in firefox ... WTF, I'll fix it asap

[WebReflection]

fixed on 0.4.1, apologies for any inconvenience

[rconnamacher]

Thanks for the speedy fix, it's working here now too.