相关疑难解决方法(0)

我究竟做错了什么？

<ul>
<li class="facebook"> Facebook</li>
<li><i class="fab fa-twitter-square"></i> Twitter</li>
</ul>

li.facebook:before {
    content: "\f09a";
    font-family: FontAwesome;
}
li {
  list-style:none;
}

JSFiddle:https://jsfiddle.net/labanino/nwodoo32/