It’s Internet Explorer again.
The overflow: hidden css attribute does not work in Internet Explorer 6/7. The workaround is to set the position to relative. Continue reading CSS – Internet Explorer 7 Overflow Hidden Problem
It’s Internet Explorer again.
The overflow: hidden css attribute does not work in Internet Explorer 6/7. The workaround is to set the position to relative. Continue reading CSS – Internet Explorer 7 Overflow Hidden Problem
Not only the HTML link will have a dotted outline after being clicked, if you have a transparent input button, you will find the dotted outline too.

The following css could help you to remove it.
/*for FireFox*/
input[type="submit"]::-moz-focus-inner, input[type="button"]::-moz-focus-inner {
border : 0px;
}
/*for IE8 */
input[type="submit"]:focus, input[type="button"]:focus {
outline : none;
}
Continue reading HTML – Remove Dotted Line of Transparent Button