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/CSS

mask-origin

The mask-origin CSS property sets the origin of a mask.

/* Keyword values */
mask-origin: content-box;
mask-origin: padding-box;
mask-origin: border-box;
mask-origin: margin-box;
mask-origin: fill-box;
mask-origin: stroke-box;
mask-origin: view-box;

/* Multiple values */
mask-origin: padding-box, content-box;
mask-origin: view-box, fill-box, border-box;

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

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

For elements rendered as a single box, this property specifies the mask positioning area. In other words, this property specifies the origin position of an image specified by the mask-image CSS property. For elements rendered as multiple boxes, such as inline boxes on several lines or boxes on several pages, it specifies which boxes box-decoration-break operates upon to determine the mask positioning area.

Syntax

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

Values

content-box
The position is relative to the content box.
padding-box
The position is relative to the padding box. For single boxes 0 0 is the upper left corner of the padding edge, 100% 100% is the lower right corner.
border-box
The position is relative to the border box.
margin-box
The position is relative to the margin box.
fill-box
The position is relative to the object bounding box.
stroke-box
The position is relative 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.
content
Same as content-box.
padding
Same as padding-box.
border
Same as border-box.

Formal definition

Initial value border-box
Applies to all elements; In SVG, it applies to container elements excluding the defs element and all graphics elements
Inherited no
Computed value as specified
Animation type discrete

Formal syntax

<geometry-box>#

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

Setting mask origin to border-box

CSS

#masked {
  width: 100px;
  height: 100px;
  margin: 10px;
  border: 10px solid blue;
  background-color: #8cffa0;
  padding: 10px;
  mask-image: url(https://mdn.mozillademos.org/files/12676/star.svg);
  mask-origin: border-box; /* Can be changed in the live sample */
}

Result

Specifications

Specification Status Comment
CSS Masking Module Level 1
The definition of 'mask-origin' in that specification.
Candidate Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
mask-origin 1
Prefixed
1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
The margin-box value is unsupported.
79
Prefixed
79
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
The margin-box value is unsupported.
53
53
20 — 53
Disabled
Disabled From version 20 until version 53 (exclusive): this feature is behind the layout.css.masking.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 15
Prefixed
15
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
The margin-box value is unsupported.
4
Prefixed
4
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
The margin-box value is unsupported.
fill-box No No No No No No
Non-standard values content, padding, border 1
Prefixed
1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
79
Prefixed
79
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
No No 15
Prefixed
15
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
4
Prefixed
4
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
stroke-box No No No No No No
view-box No No No No No No
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
mask-origin 2
Prefixed
2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
The margin-box value is unsupported.
18
Prefixed
18
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
The margin-box value is unsupported.
53
53
20 — 53
Disabled
Disabled From version 20 until version 53 (exclusive): this feature is behind the layout.css.masking.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
14
Prefixed
14
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
The margin-box value is unsupported.
3.2
Prefixed
3.2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
The margin-box value is unsupported.
1.0
Prefixed
1.0
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
The margin-box value is unsupported.
fill-box No No No No No No
Non-standard values content, padding, border 2
Prefixed
2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
18
Prefixed
18
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
No 14
Prefixed
14
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
3.2
Prefixed
3.2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
1.0
Prefixed
1.0
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
stroke-box No No No No No No
view-box No No No No No No

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/mask-origin