Property Reference - CSS Reference - page 178

Name
column-span
Values:
none | all
Initial value:
none
Applies to:
Static-position nonfloating elements
Inherited:
No
Computed value:
Same as declared value
Description:
Defines the number of columns an element spans in an element laid out with multiple
columns. There are only two options: to span no columns at all ( none ) or to span all columns
( all ). When an element spans multiple columns, content that comes before it is balanced
above it across the columns. Content that comes after is balanced below the spanning element.
Examples:
h2 {column-span: all;}