[csswg-drafts] [css-overflow] Clarifying the bounds for the scrollable overflow additional padding (#13883)

stevennovaryo has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-overflow] Clarifying the bounds for the scrollable overflow additional padding ==
From https://drafts.csswg.org/css-overflow-3/#scrollable-overflow-region:
> - Additional padding added to the [scrollable overflow rectangle](https://drafts.csswg.org/css-overflow-3/#scrollable-overflow-rectangle) as necessary to enable scroll positions that satisfy the requirements of both [place-content: start](https://drafts.csswg.org/css-align-3/#propdef-place-content) and place-content: end alignment.

Based on the statement here, it is not clear what should we base the padding on, and how much are the padding are. But, this is further elaborated by a note as the following.
> This padding represents, within the [scrollable overflow rectangle](https://drafts.csswg.org/css-overflow-3/#scrollable-overflow-rectangle), the box’s own padding so that when its content is scrolled to its end, there is padding between the edge of its [in-flow](https://drafts.csswg.org/css-display-4/#in-flow) (or floated) content and the border edge of the box.

Meanwhile the second statement here mentions about *in-flow* content's edge. This doesn't really capture what is the edge for which we should add the additional padding on (e.g., it should consider pre-relative-adjusted box). Which is probably closer to [alignment subject](https://drafts.csswg.org/css-align/#alignment-subject).

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As the definition here seems a either vague or implicit, I wonder whether we could explicitly define the edge for which we should add the additional padding on and whether it would depend to a layout like [alignment subject](https://drafts.csswg.org/css-align/#alignment-subject).

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/13883 using your GitHub account


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Received on Monday, 4 May 2026 08:43:20 UTC