简写font属性都要写出来吗？我的为什么不显示效果？

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
       .fast{font:bold italic small-caps;}
       .last{font:blue bold small-caps;}
    </style>
    
</head>
<body>
    <p class="fast">web前端攻城狮(web front siege lion)</p>
    <p class="last">css层叠样式表(cascading style sheets)</p>
    
</body>
</html>

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