word/memory: webkit prefix for turned card faces

Workaround for some versions of Safari where images are always visible.

diff --git a/word/memory.plp b/word/memory.plp
index 11520b19b483d3a6860742e62b6ca151db83b39f..d15d619dce6e934c23e656373a94ec205ba198dc 100644 (file)
--- a/word/memory.plp
+++ b/word/memory.plp
@@ -41,6 +41,7 @@ figure, img {
 /* card faces */
 figure img {
        backface-visibility: hidden;
+       -webkit-backface-visibility: hidden;
        transform: rotateY(180deg); /* back */
        transform-style: preserve-3d;
        -float: left; /* ff workaround to prevent click selection */