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In SVG, you can specify that any other graphics object or <g> element can be used as an alpha mask for compositing the current object into the background. A mask is defined with the <mask> element. A mask is used/referenced using the mask property.

Usage context

CategoriesContainer element
Permitted contentAny number of the following elements, in any order:
Animation elements
Descriptive elements
Shape elements
Structural elements
Gradient elements
<a>, <altGlyphDef>, <clipPath>, <color-profile>, <cursor>, <filter>, <font>, <font-face>, <foreignObject>, <image>, <marker>, <mask>, <pattern>, <script>, <style>, <switch>, <text>, <view>

Attributes

Global attributes

Specific attributes

DOM Interface

This element implements the SVGMaskElement interface.

Example

SVG

<?xml version="1.0"?>
<svg width="200" height="80" viewBox="0 0 200 80" version="1.1"
    xmlns="http://www.w3.org/2000/svg" 
    xmlns:xlink="http://www.w3.org/1999/xlink">

  <defs>
    <mask id="myMask" maskUnits="userSpaceOnUse"
        x="0" y="0" width="200" height="80">
      <rect x="0" y="0" width="100" height="80" fill="white"/>
    </mask>

    <text id="Text" x="100" y="48" font-size="26" font-weight="bold"
        text-anchor="middle">
      Black & White
    </text>
  </defs>

  <!-- Draw black rectangle in the background -->
  <rect x="100" y="10" width="95" height="60" />
  
  <!-- Draw the text string twice. First, the white text without mask.
       Second, the black text with the mask applied-->
  <use xlink:href="#Text" fill="white"/>
  <use xlink:href="#Text" fill="black" mask="url(#myMask)"/>
</svg>

Result

Specifications

Specification Status Comment
CSS Masking Module Level 1
The definition of '<mask>' in that specification.
Candidate Recommendation  
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
The definition of '<mask>' in that specification.
Recommendation Initial definition

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) ?
Feature Android Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support ? (Yes) ? ? ? ?

See also

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