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 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 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.
<position>
<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>
#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 |
Desktop | ||||||
---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
Basic support | 1
|
18 | 53 | ? | ? | 4
|
Mobile | |||||||
---|---|---|---|---|---|---|---|
Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
Basic support | ? | ? | ? | 53 | ? | ? | ? |
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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-position