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: revert; mask-position: unset; 

mask-position

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: revert; mask-position: unset; 

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 definition

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)
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

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>

Examples

Setting mask position

Change the mask-position value to any of the allowed values detailed above. If viewing the example in a Chromium-based browser change the value of -webkit-mask-position.

Specifications

Specification
CSS Masking Module Level 1 # the-mask-position

See also

Clipping and Masking in CSS

Last modified: Aug 12, 2021, by MDN contributors

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