Draft:    https://www.w3.org/TR/2021/WD-css-multicol-1-20210212/
Title:    CSS Multi-column Layout Module Level 1

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Issue 1.
Summary:  Prevent column spanners from escaping containing blocks created by transforms.
From:     Morten Stenshorne
Comment:  https://github.com/w3c/csswg-drafts/issues/6805
Closed:   Accepted
Resolved: https://github.com/w3c/csswg-drafts/issues/6805#issuecomment-1063159219