document-register-element v1 shim test

snippet.js

var F = function(self) {
  //being called from the shim
  if (self) {
    HTMLElement.call(self);
    return self;
  }
  //must be native, use Reflect.construct() to perform super()
  //this code is untested, came from rniwa
  return Reflect.construct(HTMLElement, [], F);
};

F.prototype = Object.create(HTMLElement.prototype);
F.prototype.constructor = HTMLElement;

F.prototype.testMethod = function() {
  console.log("hello world");
}

console.log(F);

//this works fine
customElements.define("st-tag", F);

//this currently crashes in Chrome Beta
//I don't think HTMLElement itself is being patched correctly
var el = document.createElement("st-tag");

el.testMethod();