Web/CSS/-webkit-mask-position-x

Non-standard This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The -webkit-mask-position-x CSS property sets the initial horizontal position of a mask image.

/* Keyword values */
-webkit-mask-position-x: left;
-webkit-mask-position-x: center;
-webkit-mask-position-x: right;

/* <percentage> values */
-webkit-mask-position-x: 100%;
-webkit-mask-position-x: -50%;

/* <length> values */
-webkit-mask-position-x: 50px;
-webkit-mask-position-x: -1cm;

/* Multiple values values */
-webkit-mask-position-x: 50px, 25%, -3em;

/* Global values */
-webkit-mask-position-x: inherit;
-webkit-mask-position-x: initial;
-webkit-mask-position-x: unset;

Initial value	`0%`
Applies to	all elements
Inherited	no
Percentages	refer to the size of the box itself
Computed value	for `<length>` the absolute value, otherwise a percentage
Animation type	discrete

Syntax

Values

<length-percentage>: A length indicating the position of the left edge of the image relative to the box's left padding edge. Percentages are calculated against the horizontal dimension of the box padding area. That means, a value of 0% means the left edge of the image is aligned with the box's left padding edge and a value of 100% means the right edge of the image is aligned with the box's right padding edge.
left: Equivalent to 0%.
center: Equivalent to 50%.
right: Equivalent to 100%.

Formal definition

Initial value	`0%`
Applies to	all elements
Inherited	no
Percentages	refer to the size of the box itself
Computed value	for `<length>` the absolute value, otherwise a percentage
Animation type	discrete

Formal syntax

[ <length-percentage> | left | center | right ]#where <length-percentage> = <length> | <percentage>

Examples

Horizontally positioning a mask image

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

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

Specifications

Not part of any standard.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`-webkit-mask-position-x` Non-standard'	Chrome Full support 1	Edge Full support 18	Firefox Full support 49	IE No support No	Opera Full support 15	Safari Full support 3.2	WebView Android Full support 2	Chrome Android Full support 18	Firefox Android Full support 49	Opera Android Full support 14	Safari iOS Full support 3.2	Samsung Internet Android Full support 1.0

Legend

Full support: Full support
No support: No support
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.