JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://www.tinymce.com/js/tinymce/jscripts/tiny_mce/tiny_mce.js"></script>
<textarea rows="100" cols="300" id="test"></textarea>

JavaScript

tinyMCE.init({
    mode: "exact",
    elements: "test",
    skin: "o2k7",
    skin_variant: "red",
    
    setup: function (ed) {
        ed.onMouseUp.add(function (ed, e) {
            var x = tinyMCE.activeEditor.selection.getContent();
            if(x)
              alert(x);
        });
    }
});