mask-border-outset

Summary

This property specifies the amount by which the mask box image area extends beyond the border box, similar to the CSS border-image-outset property. The four values set the outsets on the top, right, bottom, and left sides in that order.

Overview table

Initial value: 0
Applies to: All elements. In SVG, it applies to container elements without the <defs> element and all graphics elements.
Inherited: No
Media: visual
Computed value: All <length>s made absolute, otherwise as specified.
Animatable: No

CSS Object Model Property
:

Percentages: N/A

Syntax

mask-border-outset: length
mask-border-outset: number

Values

length: Represents pixels if the image is a raster image or vector coordinates if the image is a vector image.
number: Represents multiples of the corresponding computed border-width.

Examples

/* length */
#maskbox1: {
    mask-border-outset: 30 50 30 50;
}

Related specifications

CSS Masking Level 1: W3C Last Call Working Draft
CSS Masking Level 1: W3C Editor’s Draft