<ul>
  <li>選單1</li>
  <li>選單2</li>
  <li>選單3</li>
  <li>選單4</li>
  <li>選單5</li>
</ul>
ul>li:nth-last-child(-n+3){
  color:blue;
}
ul>li:last-child{
  color:red;
}

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