title: When should CSS font-family value use quotes?
body: <p>When should the value for CSS 'font-family' have quotes around it? </p>
  
  <p>I've seen both <code>font-family: arial</code> and <code>font-family: "arial"</code>. </p>
  
  <p>As a specific example, I declare a font this way:</p>
  
  <pre><code>@font-face {
      font-family: 'entypo';
      font-style: normal;
      font-weight: 400;
      src: url('/css/fonts/entypo.woff') format('woff');
  }
  </code></pre>
  
  <p>What would be the correct CSS to have an element use this font-family?</p>