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Showing content from https://developer.mozilla.org/en-US/docs/Web/CSS/mask-border-source below:

mask-border-source - CSS | MDN

/* Keyword value */
mask-border-source: none;

/* <image> values */
mask-border-source: url("image.jpg");
mask-border-source: linear-gradient(to top, red, yellow);

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

Values

none: No mask border is used.
<image>: Image reference to use for the mask border.

Formal definition Formal syntax

mask-border-source = 
  none     |
  <image>  <image> = 

  <url>       |
  <gradient>  <url> = 

  <url()>  |
  <src()>  <url()> = 

  url( <string> <url-modifier>* )  |
  <url-token>                      <src()> = 

  src( <string> <url-modifier>* )

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 the source of the border mask.

mask-border-source: url("image.jpg");

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

-webkit-mask-box-image-source: url("image.jpg");

Note: The mask-border page features a working example (using the out-of-date prefixed border mask properties supported in Chromium), so you can get an idea of the effect.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

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