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

If you'd like to force components to always use the open shadow DOM, you can just do:
```
var originalAttachShadow = Element.prototype.attachShadow;
Element.prototype.attachShadow = function(options) {
    options['mode'] = 'open';
    return originalAttachShadow(options);
}
```
at the beginning of the document.

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https://github.com/w3c/webcomponents/issues/354#issuecomment-162383744