mask-border

A shorthand property that lets you use an image as a 'border mask' for an element. This allows you to create decorative borders that are defined by an external image file.

It is documented as part of the CSS Masking specification.

/* Usage Example */
.decorative-box {
  mask-border: url(';border.png') 30 fill stretch;
  /* applies a custom image-based border to the element */
}

/* Syntax */
mask-border: mask-border-mode;

/* Global values */
mask-border: inherit;
mask-border: initial;
mask-border: revert;
mask-border: revert-layer;
mask-border: unset;
Widely available Since 2015 92% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.

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