Re: [csswg-drafts] [css-grid][css-flexbox][css-multicol] Styling Gaps/Gutters (#2748)

Seems to me this feels more akin to `border` than `background`:

- `border-image-source` --> `rule-image-source`
- `border-image-slice` --> `rule-image-slice`
- `border-image-width` --> `rule-image-width`
- `border-image-outset` --> perhaps not a 1:1 here since this would always be center positioned in the gutter
- `border-image-repeat` --> `rule-image-repeat`
- `border-color` --> `rule-color`

I do like the ability to have `gap-rule-interrupt` (or `rule-interrupt`) as well. We'd back to specify direction with something like `block`, `inline`, or `all`.

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