Re: [csswg-drafts] [css-values-4] min/max(%, %) should explicitly evaluate against the % value, not the resolved value (#4227)

For reference:
Safari (Version 12.1.2 (14607.3.9)) resolves `min(%, %)` against the resolved value.
See example at http://jsfiddle.net/t9bk6p0q/1/, where `min(0%, 100%)` is resolved as `100%`

I originally raised this issue as I wasn't aware of `background-position`. As I'm implementing `min/max` in Blink, I need to make sure that if we support evaluation of % against negative values, the added code paths are reachable.

Now that it's reachable, it's no longer an issue for me.

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