Support shadydom in IE11

[zhoukekestar]

Hi, thanks for your awesome project ! We try it in IE 11, run most code correctly but find some wrong in webcomponents polyfill.

You can find detail in this issue: webcomponents/polyfills#504 .

I think it can be fixed very simple by modify attachShadowObserver like this:

 try {
    observer.observe(shadowRoot, observerConfig);
  } catch (err) {
    console.info('observe shadowRoot to this');
   // we can just observe parent element in IE11, the code will run correctly.
    observer.observe(this, observerConfig);
  }

[calebdwilliams]

Is this specifically to do with ShadyDOM? If so I can just add that if the polyfill exists.

[zhoukekestar]

Yes, do different logic by detect shadydom is a better way.

[calebdwilliams]

@zhoukekestar can you try [email protected]

[zhoukekestar]

Test 1.1.3 on IE 11, and it works now. Thanks a lot.