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.

Initial valueborder-box
Applies toall elements; In SVG, it applies to container elements excluding the defs element and all graphics elements
Inheritedno
Mediavisual
Computed valueas specified
Animation typediscrete
Canonical orderper grammar

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 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

Example

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 */
}

Specifications

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

Browser compatibility

 

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
mask-origin
Experimental
Chrome Full support 1
Prefixed Notes
Full support 1
Prefixed Notes
Prefixed Implemented with the vendor prefix: -webkit-
Notes The margin-box value is unsupported.
Edge No support NoFirefox Full support 53
Full support 53
No support 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.
IE No support NoOpera Full support 15
Prefixed Notes
Full support 15
Prefixed Notes
Prefixed Implemented with the vendor prefix: -webkit-
Notes The margin-box value is unsupported.
Safari Full support 4
Prefixed Notes
Full support 4
Prefixed Notes
Prefixed Implemented with the vendor prefix: -webkit-
Notes The margin-box value is unsupported.
WebView Android Full support 2
Prefixed Notes
Full support 2
Prefixed Notes
Prefixed Implemented with the vendor prefix: -webkit-
Notes The margin-box value is unsupported.
Chrome Android Full support 18
Prefixed Notes
Full support 18
Prefixed Notes
Prefixed Implemented with the vendor prefix: -webkit-
Notes The margin-box value is unsupported.
Firefox Android Full support 53
Full support 53
No support 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.
Opera Android Full support 14
Prefixed Notes
Full support 14
Prefixed Notes
Prefixed Implemented with the vendor prefix: -webkit-
Notes The margin-box value is unsupported.
Safari iOS Full support 3.2
Prefixed Notes
Full support 3.2
Prefixed Notes
Prefixed Implemented with the vendor prefix: -webkit-
Notes The margin-box value is unsupported.
Samsung Internet Android Full support Yes
Prefixed Notes
Full support Yes
Prefixed Notes
Prefixed Implemented with the vendor prefix: -webkit-
Notes The margin-box value is unsupported.
fill-box
Experimental
Chrome No support NoEdge No support NoFirefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android No support No
Non-standard values content, padding, border
ExperimentalNon-standard
Chrome Full support 1
Prefixed
Full support 1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Edge No support NoFirefox No support NoIE No support NoOpera Full support 15
Prefixed
Full support 15
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Safari Full support 4
Prefixed
Full support 4
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
WebView Android Full support 2
Prefixed
Full support 2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Chrome Android Full support 18
Prefixed
Full support 18
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Firefox Android No support NoOpera Android Full support 14
Prefixed
Full support 14
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Safari iOS Full support 3.2
Prefixed
Full support 3.2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Samsung Internet Android Full support Yes
Prefixed
Full support Yes
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
stroke-box
Experimental
Chrome No support NoEdge No support NoFirefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android No support No
view-box
Experimental
Chrome No support NoEdge No support NoFirefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.