[css-break] Suggest adding new value to `box-decoration-break` to allow bounding box or a separate property to control the background.

Regarding https://drafts.csswg.org/css-break/#break-decoration

Propose that a new value "bounds" for box-decoration-break.
"bounds" is a suggestion only, any string that conveys the intent.

The value intends to represent rendering the background-* properties such that they are applied to the bounding box of fragmentation boxes. The rendering would be limited to the fragmentation boxes.

E.g.

The border would be around the joined fragment boxes.

E.g.

Scenario	Example
Background
Background clipped to text which has background fragmentation

Updated based on comment from @Loirooriol:
This suggestion applies mainly to the background portion of the box-decoration-break, so possibly this belongs as its own property/sub-property. E.g. box-decoration-break-background with values slice, clone, and bounds.

Start with the CSS Break specification section linked in the issue, especially the current box-decoration-break behavior. Compare the proposed bounds value and separate background property against the illustrated fragmentation scenarios. Done means the CSS Working Group has resolved the proposal and the relevant editor draft reflects the agreed syntax and behavior.