[css-scroll-snap] Should negative scroll-padding be allowed?

[fantasai]

Was flipping through old comments and noted that we forgot to consider whether scroll-snap-padding should be restricted to non-negative values. In light of that discussion, I think we should go ahead and disallow negative values.

Thoughts?

[tabatkins]

Padding is already restricted to non-negative, and scroll-snap-padding's purpose is to make sure the snapped points don't get overlapped by other stuff positioned at the edges of the screen. A negative scroll-snap-padding would void that, as the scroller itself would overlap it.

So 👍

[frivoal]

Agreed. I suspect that if somebody actually came up with use cases, these would more likely be solved by introducing a scroll-(snap-)margin and allowing that to be negative.

[tabatkins]

Agenda+ to approve this normative change (restricting scroll-padding to non-negative values only).

[css-meeting-bot]

The CSS Working Group just discussed Scroll snap, and agreed to the following resolutions:

• RESOLVED: Accept the spec text proposed in https://github.com/w3c/csswg-drafts/issues/1084

The full IRC log of that discussion

<dael> topic: Scroll snap
<dael> github topic: https://github.com//issues/1084
<dael> astearns: Looking for WG approval for this change.
<dael> astearns: Objections?
<dael> RESOLVED: Accept the spec text proposed in https://github.com//issues/1084

[astearns]

I'm assuming we need one or more testcases for this change

[astearns]

Reopening for testcase need.