mask-origin

The mask-origin CSS property sets the origin of a mask.

For elements rendered as a single box, this property specifies the mask positioning area. In other words, this property specifies the origin position of an image specified by the mask-image CSS property. For elements rendered as multiple boxes, such as inline boxes on several lines or boxes on several pages, it specifies which boxes box-decoration-break operates upon to determine the mask positioning area.

Syntax

css

/* Keyword values */
mask-origin: content-box;
mask-origin: padding-box;
mask-origin: border-box;
mask-origin: fill-box;
mask-origin: stroke-box;
mask-origin: view-box;

/* Multiple values */
mask-origin: padding-box, content-box;
mask-origin: view-box, fill-box, border-box;

/* Non-standard keyword values */
-webkit-mask-origin: content;
-webkit-mask-origin: padding;
-webkit-mask-origin: border;

/* Global values */
mask-origin: inherit;
mask-origin: initial;
mask-origin: revert;
mask-origin: revert-layer;
mask-origin: unset;

One or more of the keyword values listed below, separated by commas.

Values

content-box: The position is relative to the content box.
padding-box: The position is relative to the padding box. For single boxes 0 0 is the upper left corner of the padding edge, 100% 100% is the lower right corner.
border-box: The position is relative to the border box.
fill-box Experimental: The position is relative to the object bounding box.
stroke-box Experimental: The position is relative to the stroke bounding box.
view-box Experimental: Uses the nearest SVG viewport as reference box. If a viewBox attribute is specified for the element creating the SVG viewport, the reference box is positioned at the origin of the coordinate system established by the viewBox attribute and the dimension of the reference box is set to the width and height values of the viewBox attribute.
content Non-standard: Same as content-box.
padding Non-standard: Same as padding-box.
border Non-standard: Same as border-box.

Formal definition

Initial value	`border-box`
Applies to	all elements; In SVG, it applies to container elements excluding the `<defs>` element and all graphics elements
Inherited	no
Computed value	as specified
Animation type	discrete

Formal syntax

mask-origin = 
  <geometry-box>#  

<geometry-box> = 
  <shape-box>  |
  fill-box     |
  stroke-box   |
  view-box     

<shape-box> = 
  <box>       |
  margin-box  

<box> = 
  border-box   |
  padding-box  |
  content-box

Examples

Setting mask origin to border-box

Try some of the other possible values by updating the CSS in the box below.

Specifications

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

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`mask-origin`	1	79	53	No	15	15.44	2	18	53	14	15.43.2	1.0
`fill-box`	No	No	53	No	No	No	No	No	53	No	No	No
`non_standard_values`	1	79	No	No	15	15.44	2	18	No	14	15.43.2	1.0
`stroke-box`	No	No	53	No	No	No	No	No	53	No	No	No
`view-box`	No	No	53	No	No	No	No	No	53	No	No	No

Docs

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