mask-border-repeat

The mask-border-repeat CSS property sets how the edge regions of a source image are adjusted to fit the dimensions of an element's mask border.

Syntax

/* Keyword value */
mask-border-repeat: stretch;
mask-border-repeat: repeat;
mask-border-repeat: round;
mask-border-repeat: space;

/* vertical | horizontal */
mask-border-repeat: round stretch;

/* Global values */
mask-border-repeat: inherit;
mask-border-repeat: initial;
mask-border-repeat: revert;
mask-border-repeat: unset;

The mask-border-repeat property may be specified using one or two values chosen from the list of values below.

When one value is specified, it applies the same behavior on all four sides.
When two values are specified, the first applies to the top and bottom, the second to the left and right.

Values

stretch: The source image's edge regions are stretched to fill the gap between each border.
repeat: The source image's edge regions are tiled (repeated) to fill the gap between each border. Tiles may be clipped to achieve the proper fit.
round: The source image's edge regions are tiled (repeated) to fill the gap between each border. Tiles may be stretched to achieve the proper fit.
space: The source image's edge regions are tiled (repeated) to fill the gap between each border. Extra space will be distributed in between tiles to achieve the proper fit.

Formal definition

Initial value	`stretch`
Applies to	all elements; In SVG, it applies to container elements excluding the `defs` element and all graphics elements
Inherited	no
Computed value	as specified
Animation type	discrete

Formal syntax

[ stretch | repeat | round | space ]{1,2}

Examples

Basic usage

This property doesn't appear to be supported anywhere yet. When it eventually starts to be supported, it will serve to define how the border mask slice will repeat around the border — i.e. will it just repeat, or be scaled slightly so a whole number of slices fits, or be stretched so one slice fits?

mask-border-repeat: round;

Chromium-based browsers support an outdated version of this property — mask-box-image-repeat — with a prefix:

-webkit-mask-box-image-repeat: round;

Note: The mask-border page features a working example (using the out-of-date prefixed border mask properties supported in Chromium), so you can get an idea of the effect.

Specifications

Specification
CSS Masking Module Level 1 (CSS Masking 1) # the-mask-border-repeat

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`mask-border-repeat`	1	79	No See bug 877294.	No	15	3.1	1	18	No	14	3	1.0