This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The mask-position CSS property sets the initial position, relative to the mask position layer defined 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;

/*  values */
mask-position: 25% 75%;

/*  values */
mask-position: 0px 0px;
mask-position: 1cm 2cm;
mask-position: 10ch 8em;

/* Multiple values */
mask-position: 0px 0px, center;

/* Global values */
mask-position: inherit;
mask-position: initial;
mask-position: unset;
Initial value center
Applies to all elements; In SVG, it applies to container elements excluding the <defs> element and all graphics elements
Inherited no
Percentages refer to size of mask painting area minus size of mask layer image (see the text for background-position)
Media visual
Computed value Consists 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 type repeatable list of simple list of length, percentage, or calc
Canonical order per grammar


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


Is a <position>, that is 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> = [[ left | center | right | top | bottom | <length-percentage> ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ] | [ center | [ left | right ] <length-percentage>? ] && [ center | [ top | bottom ] <length-percentage>? ]]

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



#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;


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

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 1 -webkit- ? 53 ? ? 4 -webkit-
Feature Android webview Chrome for Android Edge mobile Firefox for Android IE mobile Opera Android iOS Safari
Basic support ? ? ? 53 ? ? ?

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.