prefixes for mask for safari

blockbase/assets/ponyfill.css

@@ -830,7 +830,9 @@ p.has-background {
 	height: 16px;
 	width: 16px;
 	mask-size: contain;
+	-webkit-mask-size: contain;
 	mask-repeat: no-repeat;
+	-webkit-mask-repeat: no-repeat;
 	background-color: currentColor;
 }
 

blockbase/sass/base/_mixins.scss

@@ -24,7 +24,9 @@
 		height: 16px;
 		width: 16px;
 		mask-size: contain;
+		-webkit-mask-size: contain;
 		mask-repeat: no-repeat;
+		-webkit-mask-repeat: no-repeat;
 		background-color: currentColor;
 	}
 }