css日常知识总结

::selection{
   color:#9400D3;
   background:#A9A9A9;
}
::-moz-selection{
    color:#9400D3;
    background:#A9A9A9;
}

<p><span class="cover"></span>金属质感文字</p>

p{
 color:white;background:black;
 font-weight:bold;font-size:30px;
 position:relative;
}
  span.cover{
      width:100%;height:100%;position:absolute;
      background:linear-gradient(to bottom,black 0%,transparent 50%,black);
      opacity:0.5;
}