[CSS] browser hack

#test{
  color:gray;      /* all browser */
  color:purple\9;  /* all IE */
  color:blue\0;    /* IE8 */

  +color:green;    /* IE7 */
  _color:red;      /* IE 6 */
}

:root #test{
  color:yellow\9;  /* IE9 */
}

@media screen and (-webkit-min-device-pixel-ratio:0){  /* Chrome & Safari */
  #test{
    color:orange;
  }
}

/* only apply on Firefox */
@-moz-document url-prefix() {
  #time_set table.time_set_table tr td.active{
    top:-1px;
    left:-1px;
  }
}