columns

The columns CSS property is a shorthand property allowing to set both the column-width and the column-count properties at the same time.

Initial value	as each of the properties of the shorthand: `column-width`: `auto` `column-count`: `auto`
Applies to	non-replaced `block` elements (except `table` elements), `table-cell` or `inline-block` elements
Inherited	no
Media	visual
Computed value	as each of the properties of the shorthand: `column-width`: the absolute length, zero or larger `column-count`: as specified
Animation type	as each of the properties of the shorthand: `column-width`: a length `column-count`: an integer
Canonical order	order of appearance in the formal grammar of the values

Syntax

columns: 1em;
columns: 1;
columns: auto;
columns: 1 auto;
columns: auto 12em;
columns: auto auto;

<'column-width'>: Is a <length> value giving a hint of the optimal width of the column. The actual column width may be wider (to fill the available space), or narrower (only if the available space is smaller than the specified column width). The length must be strictly positive or the declaration is invalid.
<'column-count'>: Is a strictly positive <integer> describing the ideal number of columns into which the content of the element will be flowed. If the column-width is also set to a non-auto value, it merely indicates the maximum allowed number of columns.

<'column-width'> || <'column-count'>

.content-box {
  border: 10px solid #000000;
  columns:3;
}

Specification	Status	Comment
CSS Multi-column Layout Module The definition of 'columns' in that specification.	Candidate Recommendation	Initial definition

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	(Yes) -webkit 50.0	(Yes)-webkit (Yes)	9 (9) -moz 52 (52)^[1]	10	11.10 15 -webkit	3.0 (522)-webkit
on `display:` `table-caption`	(Yes)	(Yes)	37 (37)	(Yes)	(Yes)	(Yes)

Feature	Android	Android Webview	Edge	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile	Chrome for Android
Basic support	2.1 -webkit	50.0	(Yes)-webkit (Yes)	22.0 (22) -moz 52.0 (52)^[1]	10	11.5 32 -webkit	3.2 -webkit	50.0
on `display:` `table-caption`	(Yes)	?	(Yes)	37.0 (37)	(Yes)	(Yes)	(Yes)	?

[1] Unprefixed as of Chrome 50.

[2] Unprefixed as of Gecko 52, with prefixed aliases still available.