CSS - mask-position

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

Example

CSS

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.exampleOne {
  mask-image: url(mask.png);
  mask-position: bottom right;
}

.exampleTwo {
  mask-image: url(mask.png);
  mask-position: 25%;
}

Syntax

CSS

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/* 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;

Values

<position>: 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

CSS

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<a title="" href="css/position_value"><position></a><a title="Hash mark" href="css/value_definition_syntax#hash_mark_(.23)">#</a><p>where <br><code><position> = <a title="Brackets" href="css/value_definition_syntax#brackets">[</a><a title="Brackets" href="css/value_definition_syntax#brackets">[</a> left <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> center <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> right <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> top <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> bottom <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> <a href="css/mask-position#length-percentage"><length-percentage></a> <a title="Brackets" href="css/value_definition_syntax#brackets">]</a> <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> <a title="Brackets" href="css/value_definition_syntax#brackets">[</a> left <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> center <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> right <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> <a href="css/mask-position#length-percentage"><length-percentage></a> <a title="Brackets" href="css/value_definition_syntax#brackets">]</a> <a title="Brackets" href="css/value_definition_syntax#brackets">[</a> top <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> center <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> bottom <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> <a href="css/mask-position#length-percentage"><length-percentage></a> <a title="Brackets" href="css/value_definition_syntax#brackets">]</a> <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> <a title="Brackets" href="css/value_definition_syntax#brackets">[</a> center <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> <a title="Brackets" href="css/value_definition_syntax#brackets">[</a> left <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> right <a title="Brackets" href="css/value_definition_syntax#brackets">]</a> <a href="css/mask-position#length-percentage"><length-percentage></a><a title="Question mark" href="css/value_definition_syntax#question_mark_(.3f)">?</a> <a title="Brackets" href="css/value_definition_syntax#brackets">]</a> && <a title="Brackets" href="css/value_definition_syntax#brackets">[</a> center <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> <a title="Brackets" href="css/value_definition_syntax#brackets">[</a> top <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> bottom <a title="Brackets" href="css/value_definition_syntax#brackets">]</a> <a href="css/mask-position#length-percentage"><length-percentage></a><a title="Question mark" href="css/value_definition_syntax#question_mark_(.3f)">?</a> <a title="Brackets" href="css/value_definition_syntax#brackets">]</a><a title="Brackets" href="css/value_definition_syntax#brackets">]</a></code></p><p>where <br><code><length-percentage> = <a title="Possible values: a number followed by'em', 'ex', 'ch', 'rem', 'px', 'cm', 'mm', 'in', 'vh', 'vw', 'vmin', 'vmax', 'pt', 'pc' or 'px', like 3px, 1.5cm, -0.5em or 0" href="css/length"><length></a> <a title="Single bar" href="css/value_definition_syntax#single_bar">|</a> <a title="" href="css/percentage"><percentage></a></code></p>

Description

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

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.
Animatable	yes, as a repeatable list of , a simple list of , a length, percentage or calc(); when both values are lengths, they are interpolated as lengths; when both values are percentages, they are interpolated as percentages; otherwise, both values are converted into a `calc()` function that is the sum of a length and a percentage (each possibly zero), and these `calc()` functions have each half interpolated as real numbers.
Canonical order	the unique non-ambiguous order defined by the formal grammar

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	1.0-webkit	No support^[2]	?	?	4.0-webkit

Feature	Android	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	?	No support^[1]	?	?	?

[1] Gecko currently doesn't implement this feature. See bug 1251161.

Specifications

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

License

© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/css/mask-position

CSS CSS Masks CSS Property Experimental NeedsLiveSample Reference