-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.

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

Syntax

css
/* 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;

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 elements and :-moz-tree-image, :-moz-tree-twisty, and :-moz-tree-checkbox pseudo-elements. Note: -moz-image-region only works with 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

 -moz-image-region =
   <shape> | auto

Examples

Clipping an image

css
#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