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From https://lists.w3.org/Archives/Public/public-webapps/2015AprJun/0052.html "Isolated shadow DOM. This is the idea of having a "DOM worker" so that instead of ten <iframe>s with ten globals you can have one global with ten somethings. This would give applications more parallelization opportunities and would hopefully enable a large number of companies from moving away of the practice of using cross-origin <script> with all its security implications."
Old proposal: https://docs.google.com/document/d/1V7ci1-lBTY6AJxgN99aCMwjZKCjKv1v3y_7WLtcgM00/edit?pli=1
Moved to https://github.com/w3c/webcomponents/issues/72