JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
     <h2> Varför?</h2>

     <h3> Usp: </h3>

    <div> <span contenteditable="true" class="text1">
         Skrivhär
      </span>

    </div>
    <button onclick="toggle11();">click</button>
</div>

JavaScript

function toggle11() {
    var el = document.getElementsByClassName("text1")[0];
    var range = document.createRange();
    range.selectNodeContents(el);
    var sel = window.getSelection();
    sel.removeAllRanges();
    sel.addRange(range);
};