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Transparencias

Internet Explorer

filter: alpha(opacity=50); /* internet explorer */

KHTML

khtml-opacity: 0.5;      /* khtml, version anterior de safari */

Firefox,Mozilla,Netscape

-moz-opacity: 0.5;       /* firefox, mozilla, netscape */

Safari,Chrome,Opera

opacity: 0.5;           /* safari, chrome, opera */
-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)"
--

Para todos

filter: alpha(opacity=50); /* internet explorer */

-khtml-opacity: 0.5;      /* khtml, version anterior de safari */

-moz-opacity: 0.5;       /* firefox, mozilla, netscape */

opacity: 0.5;           /* safari, chrome, opera */

-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)"