-webkit-mask-position-x

Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.

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

Syntax

css

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

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

-webkit-mask-position-x = 
  [ <length-percentage> | left | center | right ]#  

<length-percentage> = 
  <length>      |
  <percentage>

Examples

Horizontally positioning a mask image

css

.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.