[css-multicol] z-order of column rule and column scrolling

[rachelandrew]

In Column Gaps and Rules is the text:

Column rules are painted in the inline content layer, but below all inline content inside the multicol element.

This was added due to the resolution of Feb 2013

There is a discussion in October 2013 suggesting a change to this wording, plus the addition of a clarification re: scrolling:

Column rules are painted just above the border of the multicol element. For scrollable multicol elements, note that while the border and background of the multicol element obviously aren't scrolled, the rules need to scroll along with the columns.

I don't see any resolution to this discussion, it doesn't seem to have been edited into the spec. Posting it here as an open issue.

This is one of a list of legacy issues I'm digging out of the www-style archives.

[rachelandrew]

An example so we can see how this currently behaves, use Firefox to see the overflowing item painted over the rule (existing clipping interop issue means you can't see that in other browsers) https://bugs.chromium.org/p/chromium/issues/detail?id=269061#c19

https://codepen.io/rachelandrew/pen/OOXYZY?editors=1100

I think this is just a straightforward edit, as it seems to be what browsers are doing anyway.

Relevant section of the spec: https://www.w3.org/TR/css-multicol-1/#column-gaps-and-rules

[css-meeting-bot]

The Working Group just discussed z-order of column-rule and column scrolling.

The full IRC log of that discussion

<eae> Topic: z-order of column-rule and column scrolling
<eae> github issue: https://github.com//issues/1739

[css-meeting-bot]

The Working Group just discussed Multicolumn issues, and agreed to the following resolutions:

• RESOLVED: Apply proposed edit from Oct 2013 to spec.

The full IRC log of that discussion

<Rossen> Topic: Multicolumn issues
<Rossen> github: https://github.com//issues/1739
<eae> rachelandrew: These first three issues are ones I dig out from the mailing list archive. They're all quite old.
<eae> rachelandrew: Things we've discussed, not sure what to do so brinng them up here.
<eae> rachelandrew: First one. z-order for column scrolling.
<eae> rachelandrew: Suggested change to wording.
<eae> rachelandrew: Is this something we want to add into the spec or do we need to dicuss it?
<eae> florian: Do we have interop on the proposed wording?
<eae> rachelandrew: There is an issue with overflow which as resolved a while ago, interop on the issue across browsers as far as I can tell.
<eae> rachelandrew: Firefox does not support spanning.
<eae> Rossen: Firefox is different due to that.
<eae> rachelandrew: Right, relating to the fact that thay haven't implemented it.
<eae> florian: The things that is linked to is not a minimized test case. Is an example.
<eae> rachelandrew: Correct.
<eae> Proposed resolution: Apply proposed edit from Oct 2013 to spec.
<bkardell_> sfbay
<eae> florian: A minimal test case would be good, but I'm fine with it.
<eae> Rossen: There is one in the github issue
<eae> rachelandrew: I'll add a test as part of spec change.
<eae> florian: I volunteer to review it.
<eae> RESOLVED: Apply proposed edit from Oct 2013 to spec.