CSS allows to define that element contents wrap into multiple columns with gaps and rules between them.
CSS Multi-column Layout Module Level 1 is, as of 12 April 2011, a W3C Candidate Recommendation. Since then, a few smaller changes were made. It is considered to be in the Stable stage.
As of 3 July 2017, Microsoft's Internet Explorer 10 and 11 and Edge browsers only support an older version of the specification using a vendor prefix.