-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.

Summary

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

Initial value	`0%`
Applies to	all elements
Inherited	no
Percentages	refer to the size of the box itself
Media	visual
Computed value	for `<length>` the absolute value, otherwise a percentage
Animation type	discrete
Canonical order	order of appearance in the formal grammar of the values

Syntax

/* 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;

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 syntax

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

Examples

.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 specification.

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	1.0	No support	No support	No support	4.0

Feature	Android	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	?	No support	No support	No support	?