[css-overflow-3][css-overflow-4][css-box-3] A switch for bottom/right (end) overflow to not be scrollable contribution, like top/left (start) #3953
Description
https://drafts.csswg.org/css-overflow-3/
https://drafts.csswg.org/css-overflow-4/
I know historically we have the whole from top/left nature of the web that makes things like transforms, abspos, and negative margins across bottom/right edges create scrollable overflow, but doesn't when crossing top/left edges. This definitely makes sense being the default in many situations, but I have had to hack my way around bottom/right edges enough times to wish there was a switch that made all edges "trim" like top/left, regardless of used overflow or clip-path values.
With issues like #3068, #129, #3653, & #3665 being ironed out, I wonder if an overflow-trim property, akin to margin-trim could be a switch from auto to trim that allows bottom/right, logical end, directions to behave the same as top/left, logical start, directions, where descendent geometry could cross those boundaries and not contribute to the nearest scrollable ancestors overflow?