/ less / core.less
core.less
 1  // Base Class Definition
 2  // -------------------------
 3  
 4  .@{fa-css-prefix} {
 5    display: inline-block;
 6    font: normal normal normal @fa-font-size-base/@fa-line-height-base @fa-font-family; // shortening font declaration
 7    font-size: inherit; // can't have font-size inherit on line above, so need to override
 8    text-rendering: auto; // optimizelegibility throws things off #1094
 9    -webkit-font-smoothing: antialiased;
10    -moz-osx-font-smoothing: grayscale;
11  
12  }