I have this line in my CSS:
.ui-icon-zoom-in { content: url(images/16x16/ZoomIn.png); }
Which I am using with jQuery UI Button widget li
I had the same situation in IE 11. The content is So in Chrome it works like this
.image { content: url("image.jpg"); }
To make it Works in IE i have set the content option to :after element. Like
content
:after
.image:after { content: url("image.jpg"); }