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a {  -webkit-mask: url(add.png), url(substract.png);  -webkit-mask-composite: source-over;          mask: url(add.png) add, url(substract.png);}
a {  -webkit-mask: url(intersect.png), url(exclude.png);  -webkit-mask-composite: source-in, xor;          mask: url(intersect.png) intersect, url(exclude.png);}
a {  -webkit-mask: url(image.png), url(image.png), url(image.png);  -webkit-mask-composite: source-in, source-over, xor;          mask: url(image.png) intersect, url(image.png) add, url(image.png);}
a {  -webkit-mask-composite: source-over;          mask-composite: add;}
a {  mask-composite:;}
a {  -webkit-mask-composite: source-over, source-out, xor;          mask-composite: add, subtract, exclude;}