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 theviewBox
attribute and the dimension of the reference box is set to the width and height values of theviewBox
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-box
where
<shape-box> = <box> | margin-box
where
<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 1 The definition of 'mask-origin' in that specification. |
Candidate Recommendation | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
mask-origin | Chrome
Full support
1
| Edge
Full support
79
| Firefox
Full support
53
| IE No support No | Opera
Full support
15
| Safari
Full support
4
| WebView Android
Full support
2
| Chrome Android
Full support
18
| Firefox Android
Full support
53
| Opera Android
Full support
14
| Safari iOS
Full support
3.2
| Samsung Internet Android
Full support
1.0
|
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 | Chrome
Full support
1
| Edge
Full support
79
| Firefox No support No | IE No support No | Opera
Full support
15
| Safari
Full support
4
| WebView Android
Full support
2
| Chrome Android
Full support
18
| Firefox Android No support No | Opera Android
Full support
14
| Safari iOS
Full support
3.2
| Samsung Internet Android
Full support
1.0
|
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.