CSS: Hide text for Screenreaders or hide visually but not for screenreaders

CSS: Hide text for Screenreaders or hide visually but not for screenreaders

/* Hide for all Screenreaders  http://www.456bereastreet.com/archive/200711/screen_readers_sometimes_ignore_displaynone/ */
.hidden {
    display:none;
    visibility:hidden;
}

/* Hide visually but read in Screenreaders http://webaim.org/techniques/css/invisiblecontent/ */
.screen-reader-text {
    position:absolute;
    left:-10000px;
    top:auto;
    width:1px;
    height:1px;
    overflow:hidden;
}