Help:Columns

To create columns in an article one may use colbegin and colend (but note that this is not supported by Internet Explorer and Opera: see colbegin for details)

produces:

You can also use col-begin, col-break, and col-end.

As such:

creates

CSS
MediaWiki:Common.css defines the following styles:
 * ".references-2column"
 * "div.columns-2", "div.columns-3", "div.columns-4" and "div.columns-5" which need to contain a "div.column"

Templates

 * colbegin and divbegin - utilises CSS3 features
 * Columns-start - defines CSS classes (see above)
 * Multicol - uses deprecated HTML element "MULTICOL"
 * col-begin - uses a HTML table (also adds a MULTICOL attribute)
 * col-begin-small

CSS3 multicolumn support
The templates colbegin and divbegin use a feature in CSS3 that is implemented in:
 * Gecko based browsers, such as Mozilla Firefox
 * Webkit based browsers, such as Safari

Not supported:
 * Trident based browsers, such as Internet Explorer
 * Presto based browsers, such as Opera