Re: [csswg-drafts] [css-shapes] Calculation of corner radii by margin-box and border-radius

I believe that would also match the [spec for box-shadow 
spread](https://drafts.csswg.org/css-backgrounds-3/#shadow-shape), 
since that spec says:
> However, in order to create a sharper corner when the border radius 
is small, when the border radius is less than the spread distance, the
 spread distance is multiplied by the proportion 1 + (r-1)3, where r 
is the ratio of the border radius to the spread distance, in 
calculating the corner radii of the spread shadow shape.

... and since border-radius must be nonnegative, it can only be less 
than the spread distance when the spread distance is positive.

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