Re: [csswg-drafts] [css-multicol] Margin collapsing does not make sense with column-spans.

I just wrote [a testcase](https://wptest.center/#/44eyp2), and I don't understand what browsers are doing; this is wild... @rachelandrew @fantasai @frivoal 

Chrome
![win10_chrome_69 0](https://user-images.githubusercontent.com/364405/47286240-2127f680-d5ee-11e8-90dc-8305e626e7e1.png)

Edge
![win10_edge_insider_preview](https://user-images.githubusercontent.com/364405/47286157-d4442000-d5ed-11e8-8f8f-971db45e3a9e.png)
FF
![win10_firefox_62 0](https://user-images.githubusercontent.com/364405/47286158-d5754d00-d5ed-11e8-809d-40b46375fc91.png)
Safari
![macmo_safari_12 0](https://user-images.githubusercontent.com/364405/47286153-d312f300-d5ed-11e8-8237-988b9a90cd77.png)


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Received on Monday, 22 October 2018 10:40:56 UTC