JSFiddle - React, Tailwind, and code Playground

by Imri Paloja

HTML

<button onclick="Bold()">
  Bold
</button>
<div contenteditable="true">
  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
</div>

JavaScript

/**
 * Returns the text from the current selection
 * @private
 * @return {string|boolean}
 */
function getSelectedText() {
  var range;
  if (window.getSelection) { // all browsers, except IE before version 9
    range = window.getSelection();
    return range.toString() ? range.toString() : range.focusNode.nodeValue;
  } else if (document.selection.createRange) { // Internet Explorer
    range = document.selection.createRange();
    return range.text;
  }
  return false;
}
function Bold() {
	console.log(getSelectedText());
}