goog.style.setOpacity handles the IE8 case (but we are doing the same above in the same function) and Firefox prior to version 3.5 (latest stable release in April 2011). See https://developer.mozilla.org/en-US/docs/Web/CSS/opacity
goog.style.setOpacity handles the IE8 case (but we are doing the same above in the same function) and Firefox prior to version 3.5 (latest stable release in April 2011). See https://developer.mozilla.org/en-US/docs/Web/CSS/opacity