JSFiddle - React, Tailwind, and code Playground

HTML

<ul id='myul'>
  <li>
    <a href="http://domain.com/link1">Link1</a>
    <span>something1</span>
  </li>
  <li>
    <a href="http://domain.com/link2">Link2</a>
    <span>something1</span>
  </li>
  <li>
    <a href="http://domain.com/link4">Link4</a>
    <span>something1</span>
  </li>
  <li>
    <a href="http://domain.com/link1">Link1</a>
    <span>something1</span>
  </li>
    <li>
    <a href="http://domain.com/link2">Link2</a>
    <span>something1</span>
  </li>
</ul>

JavaScript

var url = [];
$("#myul").find("li").each(function(){
    var href = $(this).find("a").attr("href");
    if(url.indexOf(href) >= 0){
        $(this).remove();
    }
    else{
        url.push(href);
    }
});