Re: [w3c/webcomponents] A proposal to help with testing/SEO/accessibility of closed ShadowDOM (#505)

Reading it means that your program could become dependant on the internal state of the tree, which defeats one of the advantages _closed_ provides.

For automated testing, consideration for shadow trees really needs adding to the WebDriver spec.  This has to be done regardless of any new methods that could be added to web components, so there's little point in adding them purely for that purpose. 

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