mask-position

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The mask-position CSS property sets the initial position, relative to the mask position layer set by mask-origin, for each defined mask image.

/* Keyword values */
mask-position: top;
mask-position: bottom;
mask-position: left;
mask-position: right;
mask-position: center;

/* <position> values */
mask-position: 25% 75%;
mask-position: 0px 0px;
mask-position: 10% 8em;

/* Multiple values */
mask-position: top right;
mask-position: 1rem 1rem, center;

/* Global values */
mask-position: inherit;
mask-position: initial;
mask-position: unset;
Initial valuecenter
Applies toall elements; In SVG, it applies to container elements excluding the defs element and all graphics elements
Inheritedno
Percentagesrefer to size of mask painting area minus size of mask layer image (see the text for background-position)
Mediavisual
Computed valueConsists of two keywords representing the origin and two offsets from that origin, each given as an absolute length (if given a <length>), otherwise as a percentage.
Animation typerepeatable list of simple list of length, percentage, or calc
Canonical orderper grammar

Syntax

One or more <position> values, separated by commas.

Values

<position>
One to four values representing a 2D position regarding the edges of the element's box. Relative or absolute offsets can be given. Note that the position can be set outside of the element's box.

Formal syntax

<position>#

where
<position> = [ [ left | center | right ] || [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]? | [ [ left | right ] <length-percentage> ] && [ [ top | bottom ] <length-percentage> ] ]

where
<length-percentage> = <length> | <percentage>

Example

CSS

#wrapper {
  border: 1px solid black;
  width: 250px;
  height: 250px;
}

#masked {
  width: 250px;
  height: 250px;
  background: blue linear-gradient(red, blue);
  mask-image: url(https://mdn.mozillademos.org/files/12676/star.svg);
  mask-repeat: no-repeat;
  mask-position: top right; /* Can be changed in the live sample */
  margin-bottom: 10px;
}

Specifications

Specification Status Comment
CSS Masking Module Level 1
The definition of 'mask-position' 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-position
Experimental
Chrome Full support 1
Prefixed
Full support 1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Edge Full support 18Firefox 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
Full support 15
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Safari Full support 3.2
Prefixed
Full support 3.2
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 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
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-

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.
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.