Impirator

Thanks for the prompt reply! I was in fact using IE's debug tools to put it into IE8 mode, so I'll bet that's what it was. Sorry to make waves over nothing!

CodePen (I don't think this site supports IE8, so this may not be useful): http://codepen.io/anon/pen/kxhfD Problem Opacity isn't animated when there is an x-translation in Internet Explorer 8. Code // no opacity animation in IE8, works in modern browsers var element = document.getElementById('box'); var animation = { x: -50, opacity: 0 }; TweenMax.from(element, 1, animation); a Extra note If you replace the x with marginLeft, the opacity correctly animates. > Thank you so much for all the hard work, guys. It's really, really appreciated. <