Re: [whatwg/fullscreen] Impossible to customize the style of a dialog's ::backdrop residing inside a Shadow DOM. (#124)

@guest271314: Thanks for your effort to help find a workaround.

Having said that, this bug is claiming that there is no proper  (for example without using JS) way to style a `<dialog>`'s backdrop that lives within a custom element. Specifically see [these docs](https://developers.google.com/web/fundamentals/web-components/shadowdom#stylefromoutside) (which are not using Polymer), on how the internals of a custom element should be able to be styled **from the outside**.

Your workaround shows that one can programatically create a `dialog` inside a Shadow DOM and, programmatically attach a style to it. It could be potentially useful, but still it seems that the current choice of the spec on how `::backdrop` works, makes it impossible (I would gladly be proven wrong), to style such an element with HTML/CSS code only.

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