CSS mask-border-outset Property

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.example {
  /* Standard syntax*/
  mask-border: url("hello-world.png");
  mask-border-outset: 100px;

  /* Chromium based browser */
  -webkit-mask-box-image: url("hello-world.png");
  -webkit-mask-box-image-outset: 100px;


The mask-border-outset CSS property specifies the distance by which an element's mask-border is set out from its border box.

Default value:0
JavaScript syntax:

Standard Syntax

mask-border-outset: length|number|initial|inherit|revert|revert-layer|unset;

Browser Support


Property Values

The following table describes the values of this property:

Value Description
length The size of the mask border outset as a dimension.
number The size of the mask border outset as a multiple of the corresponding border-width.
initial Sets this property to its default value.
inherit If specified, the associated element takes the computed value of its parent element animation-delay property.
revert Reverts the cascaded value of the property from its current value to the value the property
revert-layer Rollback styles to the ones specified in previous cascade layers.
unset Resets a property to its inherited value if the property naturally inherits from its parent, and to its initial value if not.

Default CSS Property Values

selectors {
  mask-border-outset: 0;
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