fontface.css

@font-face {
    font-family: 'Features Icons';
    src: url('features-icons.eot');
    src: local('☺'), 
    url('features-icons.woff') format('woff'), 
    url('features-icons.ttf') format('truetype')
}

li a::before {
  font-family: 'Features Icons';
}

li a.ab-split-testing::before {
  content: "a";
}