-webkit-mask-box-image CSS property

Constituent properties

This property is a shorthand for the following CSS properties:

• -webkit-mask-border-source
• -webkit-mask-border-outset
• -webkit-mask-border-repeat

The values includes the <image> to be used as the mask border, and optionally four border outset values and up to two border repeat styles.

Syntax

/* default */
-webkit-mask-box-image: none;

/* image */
-webkit-mask-box-image: url("image.png");

/* image edge-offset */
-webkit-mask-box-image: url("image.png") 10 20 20 10;
-webkit-mask-box-image: url("image.png") 10px 20px 20px 10px;

/* image repeat-style */
-webkit-mask-box-image: url("image.png") space repeat;

/* image edge-offset repeat-style */
-webkit-mask-box-image: url("image.png") 10px 20px 20px 10px space repeat;

/* Global values */
-webkit-mask-box-image: inherit;
-webkit-mask-box-image: initial;
-webkit-mask-box-image: revert;
-webkit-mask-box-image: revert-layer;
-webkit-mask-box-image: unset;

Values

<image>

The location of the image resource to be used as a mask image, <gradient>, or other <image> value.

none

Used to specify that a border box is to have no mask image.

<length>

The size of the mask image's offset. See <length> for possible units.

<percentage>

The mask image's offset has a percentage value relative to the border box's corresponding dimension (width or height).

<number>

The size of the mask image's offset in pixels.

repeat

The mask image is repeated as many times as is necessary to span the border box. May include a partial image if the mask image does not divide evenly into the border box.

stretch

The mask image is stretched to contain the border box exactly.

round

The mask image is stretched somewhat and repeated such that there is no partial mask image at the end of the border box.

space

The mask image is repeated as many times as possible without stretching. There is no partial mask image at the end of the border box.

The outset values, or edge offsets, define the distances from the top, right, bottom, and left edges of the image, in that order. The values can be set as <length>, <number>, or <percentage>, with numbers interpreted as pixel lengths.

Border repeat styles, when included, are interpreted in the order of <repeat-x> <repeat-y>. If only one value is declared, the value is the same for both axes. While similar to background-repeat, the cover and contain values are not supported.

Formal definition

• Initial value: none
• Applies to: all elements
• Inherited: no
• Computed value: as specified

Formal syntax

-webkit-mask-box-image = 
  <mask-image-source> [ <mask-image-offset>{4} <mask-border-repeat>{1,2} ]  

Examples

Setting an image

.example-one {
  -webkit-mask-box-image: url("mask.png");
}

Offsetting and filling an image

.example-two {
  -webkit-mask-box-image: url("logo.png") 100px 100px 0px 0px round round;
}

Specifications

Not part of any standard.

Browser compatibility

See also

• CSS mask-border property
• CSS border-image property
• Safari CSS reference: -webkit-mask-box-image