-moz-image-region

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.

For certain XUL elements and pseudo-elements that use an image from the list-style-image property, this property specifies a region of the image that is used in place of the whole image. This allows elements to use different pieces of the same image to improve performance.

/* Keyword value */
-moz-image-region: auto;

/* <shape> value */
-moz-image-region: rect(0, 8px, 4px, 4px);

/* Global values */
-moz-image-region: inherit;
-moz-image-region: initial;
-moz-image-region: unset;

The syntax is similar to the clip property. All four values are relative to the upper left corner of the image.

Note: For a system that works on any background, see -moz-image-rect().

Syntax

Values

auto

Automatically defines the region of the image to use.

<shape>

A shape defining the part of the image to use. The rect() function defines a rectangle to use as shape. Its parameters define the top, right, bottom, and left offsets of the edges of the image, in this order.

Formal definition

Initial valueauto
Applies toXUL <image> elements and :-moz-tree-image, :-moz-tree-twisty, and :-moz-tree-checkbox pseudo-elements. Note: -moz-image-region only works with <image> elements where the icon is specified using list-style-image. It will not work with XUL <image src="url" />.
Inheritedyes
Computed valueas specified
Animation typediscrete

Formal syntax

<shape> | auto
where 
<shape> = rect(<top>, <right>, <bottom>, <left>)

Examples

Clipping an image

#example-button {
  /* display only the 4x4 area from the top left of this image */
  list-style-image: url("chrome://example/skin/example.png");
  -moz-image-region: rect(0px, 4px, 4px, 0px);
}
#example-button:hover {
  /* use the 4x4 area to the right of the first for the hovered button */
  -moz-image-region: rect(0px, 8px, 4px, 4px);
}

Specifications

Not part of any standard.

Browser compatibility

BCD tables only load in the browser

See also