Internet Explorer and Opera do not support CSS keyframe animations as of September 2011. Visitors to your page will still see the buttons without the animation applied.

jsFiddle is the perfect solution; it provides a custom environment (based on user selections) to test (or fiddle with) your JavaScript, HTML, and CSS code ... in Internet Explorer 9 with empty ...

The CSS code modifies the PayPal button slightly, centering it on the page without changing its functionality. Open the HTML source code of the Web page that contains your PayPal button in a text ...