JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    
<head>
    
<script type="text/javascript" >
function formatText() {
    //gets text
    //text = document.getElementById('field').value;
    //formats it
    document.getElementById('field').style.fontWeight = "bold";
}
</script>
        
</head>
<body>
<textarea id="field"></textarea><button onclick="formatText()">Make bold</button>
</body>
</html>