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---
title: <mask>
slug: Web/SVG/Element/mask
tags:
- Element
- SVG
- SVG Container
translation_of: Web/SVG/Element/mask
---
<div>{{SVGRef}}</div>
<p>The <strong><code><mask></code></strong> element defines an alpha mask for compositing the current object into the background. A mask is used/referenced using the {{SVGAttr("mask")}} property.</p>
<div id="Example">
<div class="hidden">
<pre class="brush: css">html,body,svg { height:100% }</pre>
</div>
<pre class="brush: html"><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></pre>
<p>{{EmbedLiveSample('Example', 100, 100)}}</p>
</div>
<h2 id="属性">属性</h2>
<dl>
<dt id="attr-cx">{{SVGAttr("height")}}</dt>
<dd>This attribute defines the height of the masking area.<br>
<small><em>Value type</em>: <a href="/docs/Web/SVG/Content_type#Length"><strong><length></strong></a> ; <em>Default value</em>: <code>120%</code>; <em>Animatable</em>: <strong>yes</strong></small></dd>
<dt>{{SVGAttr("maskContentUnits")}}</dt>
<dd>This attribute defines the coordinate system for the contents of the <code><mask></code>.<br>
<small><em>Value type</em>: <code>userSpaceOnUse</code>|<code>objectBoundingBox</code> ; <em>Default value</em>: <code>userSpaceOnUse</code>; <em>Animatable</em>: <strong>yes</strong></small></dd>
<dt>{{SVGAttr("maskUnits")}}</dt>
<dd>This attribute defines defines the coordinate system for attributes {{SVGAttr("x")}}, {{SVGAttr("y")}}, {{SVGAttr("width")}} and {{SVGAttr("height")}} on the <code><mask></code>.<br>
<small><em>Value type</em>: <code>userSpaceOnUse</code>|<code>objectBoundingBox</code> ; <em>Default value</em>: <code>objectBoundingBox</code>; <em>Animatable</em>: <strong>yes</strong></small></dd>
<dt id="attr-cx">{{SVGAttr("x")}}</dt>
<dd>This attribute defines the x-axis coordinate of the top-left corner of the masking area.<br>
<small><em>Value type</em>: <a href="/docs/Web/SVG/Content_type#Coordinate"><strong><coordinate></strong></a> ; <em>Default value</em>: <code>-10%</code>; <em>Animatable</em>: <strong>yes</strong></small></dd>
<dt id="attr-cx">{{SVGAttr("y")}}</dt>
<dd>This attribute defines the y-axis coordinate of the top-left corner of the masking area.<br>
<small><em>Value type</em>: <a href="/docs/Web/SVG/Content_type#Coordinate"><strong><coordinate></strong></a> ; <em>Default value</em>: <code>-10%</code>; <em>Animatable</em>: <strong>yes</strong></small></dd>
<dt id="attr-cx">{{SVGAttr("width")}}</dt>
<dd>This attribute defines the width of the masking area.<br>
<small><em>Value type</em>: <a href="/docs/Web/SVG/Content_type#Length"><strong><length></strong></a> ; <em>Default value</em>: <code>120%</code>; <em>Animatable</em>: <strong>yes</strong></small></dd>
</dl>
<h3 id="Global_attributes">Global attributes</h3>
<dl>
<dt><a href="/docs/Web/SVG/Attribute/Core">Core Attributes</a></dt>
<dd><small>Most notably: {{SVGAttr('id')}}</small></dd>
<dt><a href="/docs/Web/SVG/Attribute/Styling">Styling Attributes</a></dt>
<dd><small>{{SVGAttr('class')}}, {{SVGAttr('style')}}</small></dd>
<dt><a href="/docs/Web/SVG/Attribute/Conditional_Processing">Conditional Processing Attributes</a></dt>
<dd><small>Most notably: {{SVGAttr('requiredExtensions')}}, {{SVGAttr('systemLanguage')}}</small></dd>
<dt><a href="/docs/Web/SVG/Attribute/Presentation">Presentation Attributes</a></dt>
<dd><small>Most notably: {{SVGAttr('clip-path')}}, {{SVGAttr('clip-rule')}}, {{SVGAttr('color')}}, {{SVGAttr('display')}}, {{SVGAttr('fill')}}, {{SVGAttr('fill-opacity')}}, {{SVGAttr('fill-rule')}}, {{SVGAttr('filter')}}, {{SVGAttr('mask')}}, {{SVGAttr('opacity')}}, {{SVGAttr('shape-rendering')}}, {{SVGAttr('stroke')}}, {{SVGAttr('stroke-dasharray')}}, {{SVGAttr('stroke-dashoffset')}}, {{SVGAttr('stroke-linecap')}}, {{SVGAttr('stroke-linejoin')}}, {{SVGAttr('stroke-miterlimit')}}, {{SVGAttr('stroke-opacity')}}, {{SVGAttr('stroke-width')}}, {{SVGAttr("transform")}}, {{SVGAttr('vector-effect')}}, {{SVGAttr('visibility')}}</small></dd>
</dl>
<h2 id="Usage_notes">Usage notes</h2>
<p>{{svginfo}}</p>
<h2 id="仕様">仕様</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">仕様書</th>
<th scope="col">ステータス</th>
<th scope="col">コメント</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('CSS Masks', '#MaskElement', '<mask>')}}</td>
<td>{{Spec2('CSS Masks')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('SVG1.1', 'masking.html#Masking', '<mask>')}}</td>
<td>{{Spec2('SVG1.1')}}</td>
<td>初期定義</td>
</tr>
</tbody>
</table>
<h2 id="ブラウザの互換性">ブラウザの互換性</h2>
<div class="hidden">このページの互換性テーブルは構造化データから生成されます。データに貢献したい場合は <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックしてプルリクエストを送ってください。</div>
<p>{{Compat("svg.elements.mask")}}</p>
<h2 id="あわせて参照">あわせて参照</h2>
<ul>
<li>Other clipping and masking SVG elements: {{SVGElement("clipPath")}}</li>
<li>Clipping and masking CSS properties: {{cssxref("mask")}}, {{cssxref("mask-image")}},{{cssxref("mask-mode")}}, {{cssxref("mask-repeat")}}, {{cssxref("mask-position")}}, {{cssxref("mask-clip")}}, {{cssxref("mask-origin")}}, {{cssxref("mask-composite")}}, {{cssxref("mask-size")}}, {{cssxref("pointer-events")}}</li>
</ul>
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