The circles at the bottom of this site: http://benupham.com should open on click, but do not in IE 9 (and below, but concern is with IE 9). The JS is a modification of the example here. But I'm not even sure it's the js -- it could be the CSS. I'm viewing this bug through browserstack, which makes it very difficult for me to diagnose. Thank you.
You seem to be using transition in the code, that specific event is not supported by IE 10, 9 or 8. To get a better idea of the browser support available for transition or any other CSS you could check it out here: http://caniuse.com/#search=transition
If you're still having issues, I suggest showing some of your code and possible a gif of whats happening exactly.