Web/CSS/mask-origin

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

/* Keyword values */
mask-origin: content-box;
mask-origin: padding-box;
mask-origin: border-box;
mask-origin: margin-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: unset;

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

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.
margin-box: The position is relative to the margin box.
fill-box: The position is relative to the object bounding box.
stroke-box: The position is relative to the stroke bounding box.
view-box: 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 ': Same as content-box.
padding ': Same as padding-box.
border ': 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

<geometry-box>#where <geometry-box> = <shape-box> | fill-box | stroke-box | view-boxwhere <shape-box> = <box> | margin-boxwhere <box> = border-box | padding-box | content-box

Examples

Setting mask origin to border-box

CSS

#masked {
  width: 100px;
  height: 100px;
  margin: 10px;
  border: 10px solid blue;
  background-color: #8cffa0;
  padding: 10px;
  mask-image: url(https://mdn.mozillademos.org/files/12676/star.svg);
  mask-origin: border-box; /* Can be changed in the live sample */
}

HTML

<div id="masked">
</div>
<select id="origin">
  <option value="content-box">content-box</option>
  <option value="padding-box">padding-box</option>
  <option value="border-box" selected>border-box</option>
  <option value="margin-box">margin-box</option>
  <option value="fill-box">fill-box</option>
  <option value="stroke-box">stroke-box</option>
  <option value="view-box">view-box</option>
</select>

JavaScript

var origin = document.getElementById("origin");
origin.addEventListener("change", function (evt) {
  document.getElementById("masked").style.maskOrigin = evt.target.value;
});

Result

Specifications

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

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
`mask-origin`	Chrome Full support 1 Prefixed' Notes' Full support 1 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' The `margin-box` value is unsupported.	Edge Full support 79 Prefixed' Notes' Full support 79 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' The `margin-box` value is unsupported.	Firefox Full support 53 Full support 53 No support 20 — 53 Disabled' Disabled' From version 20 until version 53 (exclusive): this feature is behind the `layout.css.masking.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	IE No support No	Opera Full support 15 Prefixed' Notes' Full support 15 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' The `margin-box` value is unsupported.	Safari Full support 4 Prefixed' Notes' Full support 4 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' The `margin-box` value is unsupported.	WebView Android Full support 2 Prefixed' Notes' Full support 2 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' The `margin-box` value is unsupported.	Chrome Android Full support 18 Prefixed' Notes' Full support 18 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' The `margin-box` value is unsupported.	Firefox Android Full support 53 Full support 53 No support 20 — 53 Disabled' Disabled' From version 20 until version 53 (exclusive): this feature is behind the `layout.css.masking.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	Opera Android Full support 14 Prefixed' Notes' Full support 14 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' The `margin-box` value is unsupported.	Safari iOS Full support 3.2 Prefixed' Notes' Full support 3.2 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' The `margin-box` value is unsupported.	Samsung Internet Android Full support 1.0 Prefixed' Notes' Full support 1.0 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' The `margin-box` value is unsupported.
`fill-box`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera No support No	Safari No support No	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android No support No
Non-standard values `content`, `padding`, `border` Non-standard'	Chrome Full support 1 Prefixed' Full support 1 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Edge Full support 79 Prefixed' Full support 79 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Firefox No support No	IE No support No	Opera Full support 15 Prefixed' Full support 15 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Safari Full support 4 Prefixed' Full support 4 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	WebView Android Full support 2 Prefixed' Full support 2 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Chrome Android Full support 18 Prefixed' Full support 18 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Firefox Android No support No	Opera Android Full support 14 Prefixed' Full support 14 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Safari iOS Full support 3.2 Prefixed' Full support 3.2 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Samsung Internet Android Full support 1.0 Prefixed' Full support 1.0 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-
`stroke-box`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera No support No	Safari No support No	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android No support No
`view-box`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera No support No	Safari No support No	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android No support No

Legend

Full support: Full support
No support: No support
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.
See implementation notes.': See implementation notes.
User must explicitly enable this feature.': User must explicitly enable this feature.
Requires a vendor prefix or different name for use.': Requires a vendor prefix or different name for use.

mask-origin by Mozilla Contributors is licensed under CC-BY-SA 2.5.