Re: [whatwg/dom] Add FormControlRange interface (PR #1404)

rniwa left a comment (whatwg/dom#1404)

> > FWIW, I'd rather extend `Range` so that it can work with shadow host in general instead of creating a new interface specifically for form controls.
> 
> We explored extending Range, including shadow host support, but found compatibility and encapsulation issues that made it risky to change existing Range semantics. Based on feedback across discussions, we went with a dedicated FormControlRange instead. The trade-offs and alternatives are covered in the [explainer](https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/FormControlRange/explainer.md#extending-the-range-api-1st-approach).

Changing the behavior of `setStart`/`setEnd` wouldn't be an only way to solve this problem. I'd instead add a new argument or a new function which specifies "offset" within element's shadow tree.

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