CSS property: -webkit-mask
    Description
Defines a variety of mask properties within one declaration.
As with most composite properties, all arguments are optional.
Syntax
-webkit-mask: <attachment>, <clip>, <origin>, <image>, <repeat>, <composite>, <box_image>;
Values
- <attachment>
- Defines the scrolling or fixed nature of the image mask. See -webkit-mask-attachment. 
- <clip>
- Specifies whether the mask should extend into the border of a box. See -webkit-mask-clip. 
- <origin>
- Determines where the -webkit-mask-position property is anchored. See -webkit-mask-origin. 
- <image>
- Defines an image to be used as a mask for an element. See -webkit-mask-image. 
- <repeat>
- Defines the repeating qualities of a mask. See -webkit-mask-repeat. 
- <composite>
- Sets a compositing style for a mask. See -webkit-mask-composite. 
- <box_image>
- See -webkit-mask-box-image for details.