mask-border
Quick Summary for mask-border
mask-border CSS shorthand property lets you create a mask along the edge of an element's border.
Code Usage for mask-border
/* source | slice */ mask-border: url('border-mask.png') 25; /* source | slice | repeat */ mask-border: url('border-mask.png') 25 space; /* source | slice | width */ mask-border: url('border-mask.png') 25 / 35px; /* source | slice | width | outset | repeat | mode */ mask-border: url('border-mask.png') 25 / 35px / 12px space alpha; /* Global values */ mask-border: inherit; mask-border: initial; mask-border: revert; mask-border: unset; More Details for mask-border
mask-border
The mask-border CSS shorthand property lets you create a mask along the edge of an element's border.
Constituent properties
This property is a shorthand for the following CSS properties:
mask-border-mode mask-border-outset mask-border-repeat mask-border-slice mask-border-source mask-border-width Syntax
/* source | slice */ mask-border: url('border-mask.png') 25; /* source | slice | repeat */ mask-border: url('border-mask.png') 25 space; /* source | slice | width */ mask-border: url('border-mask.png') 25 / 35px; /* source | slice | width | outset | repeat | mode */ mask-border: url('border-mask.png') 25 / 35px / 12px space alpha; /* Global values */ mask-border: inherit; mask-border: initial; mask-border: revert; mask-border: unset; Values
<'mask-border-source'> The source image. See mask-border-source.
<'mask-border-slice'> The dimensions for slicing the source image into regions. Up to four values may be specified. See mask-border-slice.
<'mask-border-width'> The width of the border mask. Up to four values may be specified. See mask-border-width.
<'mask-border-outset'> The distance of the border mask from the element's outside edge. Up to four values may be specified. See mask-border-outset.
<'mask-border-repeat'> Defines how the edge regions of the source image are adjusted to fit the dimensions of the border mask. Up to two values may be specified. See mask-border-repeat.
<'mask-border-mode'> Defines whether the source image is treated as a luminance mask or alpha mask. See mask-border-mode.
Formal definition
| Initial value | as each of the properties of the shorthand:mask-border-mode: alphamask-border-outset: 0mask-border-repeat: stretchmask-border-slice: 0mask-border-source: nonemask-border-width: auto |
|---|---|
| Applies to | all elements; In SVG, it applies to container elements excluding the defs element and all graphics elements |
| Inherited | no |
| Percentages | as each of the properties of the shorthand:mask-border-slice: refer to size of the mask border imagemask-border-width: relative to width/height of the mask border image area |
| Computed value | as each of the properties of the shorthand:mask-border-mode: as specifiedmask-border-outset: as specified, but with relative lengths converted into absolute lengthsmask-border-repeat: as specifiedmask-border-slice: as specifiedmask-border-source: as specified, but with url() values made absolutemask-border-width: as specified, but with relative lengths converted into absolute lengths |
| Animation type | as each of the properties of the shorthand:mask-border-mode: discretemask-border-outset: discretemask-border-repeat: discretemask-border-slice: discretemask-border-source: discretemask-border-width: discrete |
| Creates stacking context | yes |
Formal syntax
<'mask-border-source'> || <'mask-border-slice'> [ / <'mask-border-width'>? [ / <'mask-border-outset'> ]? ]? || <'mask-border-repeat'> || <'mask-border-mode'>
Examples
Setting a bitmap-based mask border
In this example, we will mask an element's border with a diamond pattern. The source for the mask is a ".png" file of 90 by 90 pixels, with three diamonds going vertically and horizontally:
To match the size of a single diamond, we will use a value of 90 divided by 3, or 30, for slicing the image into corner and edge regions. A repeat value of round will make the mask slices fit evenly, i.e., without clipping or gaps.
Specifications
| Specification |
|---|
| CSS Masking Module Level 1 # the-mask-border |
See also
mask-border-mode mask-border-outset mask-border-repeat mask-border-source mask-border-width Last modified: Aug 12, 2021, by MDN contributors
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