CSS mask-border-width Property

Example

.example {
  /* Standard syntax*/
  mask-border: url("hello-world.png");
  mask-border-width: 10% 40%;
  
  /* Chromium based browser */
  -webkit-mask-box-image: url("hello-world.png");
  -webkit-mask-box-image-width: 10% 40%;
}

Meaning:

The mask-border-width CSS property sets the width of an element's mask-border.

Note: Chromium-based browsers support an outdated version of this property — -webkit-mask-box-image-width — with a prefix.

Possible values:

When one value is specified, it applies the same width to all four sides.
When two values are specified, the first width applies to the top and bottom, the second to the left and right.
When three values are specified, the first width applies to the top, the second to the left and right, the third to the bottom.
When four values are specified, the widths apply to the top, right, bottom, and left in that order (clockwise).

Default value:	auto
Inherited:	No
Animatable:	No
Version:	CSS3
JavaScript syntax:	`object.style.maskBorderWidth="auto\|number\|length\|percentage\|initial\|inherit\|revert\|revert-layer\|unset";`

Standard Syntax

mask-border-width: auto|number|length|percentage|initial|inherit|revert|revert-layer|unset;

Browser Support

Status

Property Values

The following table describes the values of this property:

Value	Description
auto	This is the default value. The width of the mask border is made equal to the intrinsic width or height (whichever is applicable) of the corresponding mask-border-slice. If the image does not have the required intrinsic dimension, the corresponding border-width is used instead.
number	The width of the mask border, specified as a multiple of the corresponding border-width. Negative number is not allowed.
length	The width of the mask border, specified as a length.
percentage	The width of the mask border, specified as a percentage. Percentages are relative to the width of the border area for horizontal offsets and the height of the border area for vertical offsets. Negative percentage is not allowed.
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-width: auto;
}

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