Re: [webcomponents] lang and xml:lang should not use the flat tree (#385)

The same way as how apps/controls work today? They can override if they want to, but defaults to OS/process locale. You want a calendar in an app to honor your OS setting by default, don't you?

Note, the CSS `all: initial` does not reset `direction` because `all` excludes `direction` and `unicode-bidi` specifically ([spec](https://drafts.csswg.org/css-cascade-4/#propdef-all)). I see similarity here.

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