mask-clip

The mask-clip CSS property determines the area which is affected by a mask. The painted content of an element must be restricted to this area.

/* <geometry-box> values */
mask-clip: content-box;
mask-clip: padding-box;
mask-clip: border-box;
mask-clip: margin-box;
mask-clip: fill-box;
mask-clip: stroke-box;
mask-clip: view-box;

/* Keyword values */
mask-clip: no-clip;

/* Non-standard keyword values */
-webkit-mask-clip: border;
-webkit-mask-clip: padding;
-webkit-mask-clip: content;
-webkit-mask-clip: text;

/* Multiple values */
mask-clip: padding-box, no-clip;
mask-clip: view-box, fill-box, border-box;

/* Global values */
mask-clip: inherit;
mask-clip: initial;
mask-clip: unset;

Syntax

One or more of the keyword values listed below, separated by commas.

Values

content-box

The painted content is clipped to the content box.

padding-box

The painted content is clipped to the padding box.

border-box

The painted content is clipped to the border box.

margin-box

The painted content is clipped to the margin box.

fill-box

The painted content is clipped to the object bounding box.

stroke-box

The painted content is clipped to the stroke bounding box.

view-box

Uses the nearest SVG viewport as reference box. If a viewBox attribute is specified for the element creating the SVG viewport, the reference box is positioned at the origin of the coordinate system established by the viewBox attribute and the dimension of the reference box is set to the width and height values of the viewBox attribute.

no-clip

The painted content is not clipped.

border

This keyword behaves the same as border-box.

padding

This keyword behaves the same as padding-box.

content

This keyword behaves the same as content-box.

text

This keyword clips the mask image to the text of the element.

Formal definition

Formal syntax

[ <geometry-box> | no-clip ]#
where 
<geometry-box> = <shape-box> | fill-box | stroke-box | view-box
where 
<shape-box> = <box> | margin-box
where 
<box> = border-box | padding-box | content-box

Examples

Clipping a mask to the border box

CSS

#masked {
  width: 100px;
  height: 100px;
  background-color: #8cffa0;
  margin: 20px;
  border: 20px solid #8ca0ff;
  padding: 20px;
  mask-image: url(https://mdn.mozillademos.org/files/12668/MDN.svg);
  mask-size: 100% 100%;
  mask-clip: border-box; /* Can be changed in the live sample */
}

<div id="masked">
</div>
<select id="clipBox">
  <option value="content-box">content-box</option>
  <option value="padding-box">padding-box</option>
  <option value="border-box" selected>border-box</option>
  <option value="margin-box">margin-box</option>
  <option value="fill-box">fill-box</option>
  <option value="stroke-box">stroke-box</option>
  <option value="view-box">view-box</option>
  <option value="no-clip">no-clip</option>
</select>

var clipBox = document.getElementById("clipBox");
clipBox.addEventListener("change", function (evt) {
  document.getElementById("masked").style.maskClip = evt.target.value;
});

Result

Specifications

Browser compatibility