CSS: blur and prohibit selection

main.css

.item-blur {
    /* blur */
    filter: blur(5px);
    -webkit-filter: blur(5px);
    -moz-filter: blur(5px);
    -o-filter: blur(5px);
    -ms-filter: blur(5px);
    filter: url(data:image/svg+xml;base64,PHN2ZyB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+DQoJPGZpbHRlciBpZD0iYmx1ciI+DQoJCTxmZUdhdXNzaWFuQmx1ciBzdGREZXZpYXRpb249IjMiIC8+DQoJPC9maWx0ZXI+DQo8L3N2Zz4=#blur);
    -webkit-transition: -webkit-filter .50s;
    /* prevent copy */
    -moz-user-select: none;
    -khtml-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.item-active {
    -moz-user-select: text;
    -khtml-user-select: text;
    -webkit-user-select: text;
    -ms-user-select: text;
    user-select: text;
}