Web/CSS/-webkit-mask-attachment

Non-standard 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.

/* Keyword values */
-webkit-mask-attachment: scroll;
-webkit-mask-attachment: fixed;
-webkit-mask-attachment: local;

/* Multiple values */
-webkit-mask-attachment: scroll, local;
-webkit-mask-attachment: fixed, local, scroll;

/* Global values */
-webkit-mask-attachment: inherit;
-webkit-mask-attachment: initial;
-webkit-mask-attachment: unset;

Syntax

Values

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

Formal definition

Initial value	`scroll`
Applies to	all elements
Inherited	no
Computed value	as specified
Animation type	discrete

Formal syntax

<attachment>#where <attachment> = scroll | fixed | local

Examples

Fixing a mask image to the viewport

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

Specifications

Not part of any standard.

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
`-webkit-mask-attachment` Non-standard'	Chrome No support 1 — 24	Edge No support No	Firefox No support No	IE No support No	Opera No support No	Safari Full support 4	WebView Android No support ≤37 — ≤37	Chrome Android No support 18 — 25	Firefox Android No support No	Opera Android No support No	Safari iOS Full support 3.2	Samsung Internet Android No support 1.0 — 1.5

Legend

Full support: Full support
No support: No support
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.