Reply To: opacity: 0 with visibility: hidden

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You mean, any reason to use both? I don’t see any, no.

Note that visibility is a completely different concept than opacity, even in legacy IE. If you ever need legacy IE compatibility again, I would suggest using MS’s opacity filter instead:

/* IE 8 */
-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";

/* IE 5-7 */ 
filter: alpha(opacity=0);