.Xa:hover {outline: 1px solid #0F0} /* ascii */
.Xl:hover {outline: 1px solid #0C0} /* latin1 */
.Xz:hover {outline: 1px solid #F00} /* proposed */
+.l0:hover {background: #888}
.l1:hover {background: #F88}
.l2:hover {background: #FC8}
.l3:hover {background: #FF8}