background-image-options
New properties to affect background images, including background-clip, background-origin and background-size
.example {
/* various options, see e.g. http://www.css3files.com/background */
background: url(image1.png), url(image2.png), url(image3.png) #FFF;
background-clip: border-box;
/*
For the not-yet-standard value of ‘text’ WebKit and Edge need -webkit-!
Firefox supports ‘text’ without prefixes:
*/
-webkit-background-clip: text;
background-clip: text;
background-origin: padding-box;
background-size: cover;
}