Property Reference - CSS Reference - page 160

Name
box-lines
Values:
single | multiple
Initial value:
single
Applies to:
Elements with a display value of box or inline-box
Inherited:
No
Computed value:
As declared
Description:
Defines how flexible boxes are laid out if they are too wide to fix in a horizontal box (see
box-orient ) . Given the value multiple , they will be laid out in as many “lines” as necessary
to display them all. This is reminiscent of float layout when multiple floats cannot fit next to
one another, though the mechanism is not exactly the same.
Examples:
div#gallery {box-lines: multiple;}
Note:
This property is from the 2009 version of the Flexible Box specification. It is expected to be
deprecated by a new version of the specification, and potentially retired from browsers some
time after.