Re: [webcomponents] Closed flag proposal breaks ability to audit and automate tests of web pages (#354)

2 is different from 1 in the following ways:

1. There is currently no efficient way to determine which nodes have a shadow root,
2. When you access the shadow root, you are accessing the DOM of the shadow root
3. The composed tree can replace the entire light DOM tree of the node according to the following algorithm http://w3c.github.io/webcomponents/spec/shadow/#composition-algorithm
4. This composed tree would not be able to be directly modified

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https://github.com/w3c/webcomponents/issues/354#issuecomment-162036074