This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

If a -webkit-mask-image is specified, -webkit-mask-attachment determines whether the mask image's position is fixed within the viewport, or scrolls along with its containing block.

Initial valuescroll
Applies toall elements
Computed valueas specified
Canonical orderorder of appearance in the formal grammar of the values


<attachment>[, <attachment>]*

<attachment> = scroll | fixed | local


If scroll is specified, the mask image scrolls within the viewport along with the block that contains the mask image.
If fixed is specified, the mask image does not scroll with its containing element, instead remaining stationary within the viewport.


body {
    -webkit-mask-image: url('images/mask.png');
    -webkit-mask-attachment: fixed;

Browser Compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support Not supported [1] Not supported Not supported Not supported 4.0
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support 2.1 Not supported Not supported Not supported 3.2

[1] Support has been droped  since Chrome 24.

See also

-webkit-mask, -webkit-mask-clip,  -webkit-mask-box-image-webkit-mask-origin, -webkit-mask-image,-webkit-mask-composite,-webkit-mask-repeat

Document Tags and Contributors

 Contributors to this page: Sebastianz, Jeremie, kscarfone, Sheppy, teoli, berkerpeksag, grendel, barlow
 Last updated by: Sebastianz,