CSS Multiple Columns
CSS layout
column-count
column-gap
column-rule-style
column-rule-width
column-rule-color
column-rule
column-span
column-width
https://caniuse.com/#search=CSS Multiple Columns
https://www.w3.org/TR/css3-multicol/
3 column layout
https://www.sitepoint.com/community/t/3-column-layout/254442
https://www.sitepoint.com/community/t/what-is-the-logic-behind-this-unexpected-minmax-1px-1fr/307909
flex
grid
refs
https://www.w3schools.com/css/css3_multiple_columns.asp
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