[Webkit-unassigned] [Bug 219291] New: Updating column-count above 2 at runtime seems to have no effect

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219291

            Bug ID: 219291
           Summary: Updating column-count above 2 at runtime seems to have
                    no effect
           Product: WebKit
           Version: Safari 14
          Hardware: All
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: peter at goodcode.nz
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 414874

  --> https://bugs.webkit.org/attachment.cgi?id=414874&action=review

Short video illustrating the buggy behaviour

When updating CSS column-count to values above 2 at runtime (i.e. with JavaScript) doesn't seem to take effect. The underlying CSS updates but the browser doesn't display more than two columns.

A basic reproduction:
https://codepen.io/editkid/pen/WNGNNew

I am under the impression that this behaviour only started recently, possibly in Safari 14.

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