JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
  <li onclick="myfunction(this)">
    <span></span>
    <p>This Text</p>
  </li>
</ul>

JavaScript

function myfunction(li) {
    var TextInsideLi = li.getElementsByTagName('p')[0].innerHTML;
    alert(TextInsideLi);
}