JSFiddle - React, Tailwind, and code Playground

by truetone

HTML

<div id="myarea" contenteditable="true"></div>

<ul>
    <li onclick="MakeBold();">B</li>
    <li><i>I</i></li>
</ul>

CSS

#myarea {
   border:1px solid #000;
   padding:5px; 
   height:150px;
   width:400px;
   overflow:scroll; 
}

ul {
    list-style: none;
}

ul li {
    width: 35px;
    height: 35px;
    border: 1px solid #ccc;
    text-align: center;
    line-height: 32px;
    font-size: 14px;
    color: #999;
    cursor: pointer;
    display: inline-block;
    margin-right: -5px;
    font-weight: bold;
    font-size: 18px;
}

ul li:hover {
    color: black;
}

JavaScript

function MakeBold() {
    document.execCommand('bold', null, false);
}