[w3c/DOM-Parsing] Shadow DOM innerHTML (Issue #73)

There needs to be a way to read the contents of a shadow DOM regardless if it's closed or open when we're not the creator. The function getInnerHTML({includeShadowRoots: true}) works if the shadow root use the template syntax but if a shadow root is generated using a generic implementation like my example below then you can't get the contents of the html of the shadow root. 

An example, 

var _div = document.createElement('div');
var root = _div.attachShadow({mode: 'open'}); // or closed
var helloWorld = document.createElement('div');
helloWorld.innerHTML = '<p>Hello World</p>';

root.appendChild(helloWorld);

I would like to be able to call the element and generate a string by doing element.shadowRoot.innerHTML. This works when we are the creator but it does not work when we're not. 

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