<mask>

The <mask> element defines an alpha mask for compositing the current object into the background. A mask is used/referenced using the mask (en-US) property.

<svg viewBox="-10 -10 120 120">
  <mask id="myMask">
    <!-- Everything under a white pixel will be visible -->
    <rect x="0" y="0" width="100" height="100" fill="white" />

    <!-- Everything under a black pixel will be invisible -->
    <path d="M10,35 A20,20,0,0,1,50,35 A20,20,0,0,1,90,35 Q90,65,50,95 Q10,65,10,35 Z" fill="black" />
  </mask>

  <polygon points="-10,110 110,110 110,-10" fill="orange" />

  <!-- with this mask applied, we "punch" a heart shape hole into the circle -->
  <circle cx="50" cy="50" r="50" mask="url(#myMask)" />
</svg>

属性

height (en-US)
This attribute defines the height of the masking area.
Value type: <length> ; Default value: 120%; Animatable: yes
maskContentUnits (en-US)
This attribute defines the coordinate system for the contents of the <mask>.
Value typeuserSpaceOnUse|objectBoundingBox ; Default value: userSpaceOnUse; Animatable: yes
maskUnits (en-US)
This attribute defines defines the coordinate system for attributes x, y, width (en-US) and height (en-US) on the <mask>.
Value typeuserSpaceOnUse|objectBoundingBox ; Default value: objectBoundingBox; Animatable: yes
x
This attribute defines the x-axis coordinate of the top-left corner of the masking area.
Value type: <coordinate> ; Default value: -10%; Animatable: yes
y
This attribute defines the y-axis coordinate of the top-left corner of the masking area.
Value type: <coordinate> ; Default value: -10%; Animatable: yes
width (en-US)
This attribute defines the width of the masking area.
Value type: <length> ; Default value: 120%; Animatable: yes

Global attributes

Core Attributes
Most notably: id
Styling Attributes
class (en-US), style (en-US)
Conditional Processing Attributes
Most notably: requiredExtensions, systemLanguage (en-US)
Presentation Attributes
Most notably: clip-path (en-US), clip-rule (en-US), color (en-US), display (en-US), fill, fill-opacity, fill-rule (en-US), filter (en-US), mask (en-US), opacity (en-US), shape-rendering (en-US), stroke, stroke-dasharray, stroke-dashoffset, stroke-linecap, stroke-linejoin, stroke-miterlimit (en-US), stroke-opacity (en-US), stroke-width (en-US), transform, vector-effect (en-US), visibility (en-US)

Usage notes

カテゴリーコンテナー要素
許可されている内容任意の数、任意の順序の以下の要素。
アニメーション要素
説明的要素
図形要素
構造的要素
グラデーション要素
<a> 、 <altGlyphDef> (en-US) 、 <clipPath> (en-US) 、 <color-profile> (en-US) 、 <cursor> (en-US) 、 <filter> (en-US) 、 <font> (en-US) 、 <font-face> (en-US) 、 <foreignObject> 、 <image> 、 <marker> (en-US) 、 <mask> 、 <pattern> 、 <script> 、 <style> (en-US) 、 <switch> 、 <text> 、 <view> (en-US)

仕様

仕様書 ステータス コメント
CSS Masking Module Level 1
<mask> の定義
勧告候補  
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
<mask> の定義
勧告 初期定義

ブラウザの互換性

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あわせて参照