This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The mask-clip CSS property determines the area, which is affected by a mask. The painted content of an element must be restricted to this area.

/* <geometry-box> values */
mask-clip: content-box;
mask-clip: padding-box;
mask-clip: border-box;
mask-clip: margin-box;
mask-clip: fill-box;
mask-clip: stroke-box;
mask-clip: view-box;

/* Keyword values */
mask-clip: no-clip;

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

/* Multiple values */
mask-clip: padding-box, no-clip;
mask-clip: view-box, fill-box, border-box;

/* Global values */
mask-clip: inherit;
mask-clip: initial;
mask-clip: unset;

Initial valueborder-box
Applies toall elements; In SVG, it applies to container elements excluding the <defs> element and all graphics elements
Computed valueas specified
Animation typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar


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


The painted content is clipped to the content box.
The painted content is clipped to the padding box.
The painted content is clipped to the border box.
The painted content is clipped to the margin box.
The painted content is clipped to the object bounding box.
The painted content is clipped to the stroke bounding 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.
The painted content is not clipped.
This keyword behaves the same as border-box.
This keyword behaves the same as padding-box.
This keyword behaves the same as content-box.
This keyword clips the mask image to the text of the element.

Formal syntax

[ <geometry-box> | no-clip ]#

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

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

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


CSS Content

#masked {
  width: 100px;
  height: 100px;
  background-color: #8cffa0;
  margin: 20px;
  border: 20px solid #8ca0ff;
  padding: 20px;
  mask-image: url(;
  mask-size: 100% 100%;
  mask-clip: border-box; /* Can be changed in the live sample */


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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (Yes)-webkit 53.0 (53.0) No support (Yes)-webkit (Yes)-webkit
border, padding, content, text 1.0-webkit ? No support (Yes) 4.0-webkit
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support ? 53.0 (53.0) No support ? ?
border, padding, content, text 2.1-webkit ? No support ? 3.2-webkit

Document Tags and Contributors

 Contributors to this page: wbamberg, chrisdavidmills, teoli, Sebastianz, Siilwyn, rolfedh
 Last updated by: wbamberg,