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mask-type

The mask-type CSS property sets whether an SVG <mask> element is used as a luminance or an alpha mask. It applies to the <mask> element itself.

/* Keyword values */
mask-type: luminance;
mask-type: alpha;

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

This property may be overridden by the mask-mode property, which has the same effect but applies to the element where the mask is used. Alpha masks will generally be faster to render.

Syntax

The mask-type property is specified as one of the keyword values listed below.

Values

luminance: Is a keyword indicating that the associated mask image is a luminance mask, i.e., that its relative luminance values must be used when applying it.
alpha: Is a keyword indicating that the associated mask image is an alpha mask, i.e., that its alpha channel values must be used when applying it.

Formal definition

Initial value	`luminance`
Applies to	`<mask>` elements
Inherited	no
Computed value	as specified
Animation type	discrete

Formal syntax

mask-type = 
  luminance  |
  alpha

Examples

Setting an alpha mask

HTML

<div class="redsquare"></div>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg"
    xmlns:xlink="http://www.w3.org/1999/xlink" width="0" height="0">
  <defs>
    <mask id="m" maskContentUnits="objectBoundingBox"
      style="mask-type:alpha">
      <rect x=".1" y=".1" width=".8" height=".8"
          fill="red" fill-opacity="0.7"/>
    </mask>
  </defs>
</svg>

CSS

.redsquare {
  height: 100px;
  width: 100px;
  background-color: rgb(128, 128, 128);
  border: solid 1px black;
  mask: url("#m");
}

Result

Setting a luminance mask

HTML

<div class="redsquare"></div>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg"
    xmlns:xlink="http://www.w3.org/1999/xlink" width="0" height="0">
  <defs>
    <mask id="m" maskContentUnits="objectBoundingBox"
      style="mask-type:luminance">
      <rect x=".1" y=".1" width=".8" height=".8"
          fill="red" fill-opacity="0.7"/>
    </mask>
  </defs>
</svg>

CSS

.redsquare {
  height: 100px;
  width: 100px;
  background-color: rgb(128, 128, 128);
  border: solid 1px black;
  mask: url("#m");
}

Result

Specifications

Specification
CSS Masking Module Level 1 # the-mask-type

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`mask-type`	24	79	35	No	15	7	37	25	35	14	7	1.5

mask-type

Syntax

Values

Formal definition

Formal syntax

Examples

Setting an alpha mask

HTML

CSS

Result

Setting a luminance mask

HTML

CSS

Result

Specifications

Browser compatibility

See also