JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://www.appmalt.info/CodeMirror/lib/codemirror.js"></script>
<script src="http://www.appmalt.info/CodeMirror/mode/xml/xml.js"></script>
<script src="http://www.appmalt.info/CodeMirror/mode/javascript/javascript.js"></script>
<script src="http://www.appmalt.info/CodeMirror/mode/css/css.js"></script>
<script src="http://www.appmalt.info/CodeMirror/mode/htmlmixed/htmlmixed.js"></script>
<link rel="stylesheet" href="http://www.appmalt.info/CodeMirror/lib/codemirror.css">
<link rel="stylesheet" href="http://www.appmalt.info/CodeMirror/doc/docs.css">
<select id='sel'>
    <option data-val='2'>Move Two Spaces from End</option>
    <option data-val='5'>Move Five Spaces from End</option>
    <option data-val='8'>Move Eight Spaces from End</option>
</select>
<br/><br/>
<textarea id='theZone'></textarea>

JavaScript

$(document).ready(function() {
    
    //Changing the textarea to a CodeMirror rich text editor
    
    var editor = CodeMirror.fromTextArea(document.getElementById('theZone'), {
        mode: 'text/html',
        lineWrapping : true,
		lineNumbers : true,
		extraKeys : {
        "Tab": "indentMore", 
        "Shift-Tab": "indentLess",
        "'>'": function(cm) { cm.closeTag(cm, '>'); },
        "'/'": function(cm) { cm.closeTag(cm, '/'); }
    } ,
    onCursorActivity: function(cm) {
        cm.setLineClass(hlLine, null, null);
        hlLine = cm.setLineClass(cm.getCursor().line, null, "activeline");
    }
    });
    
    
    //When SELECT changes - insert the value into the CM editor, set focus, get cursor position, move cursor back [x] amount of spaces.
    $('#sel').change(function() {
		var selected = $(this).find('option:selected');
		var mynum = selected.data('val');
		editor.replaceSelection($(this).val(), focus);
		editor.focus();
		var start_cursor = editor.getCursor();  //I need to get the cursor position
		alert(start_cursor);  //Cursor position always comes up [object Object]
        
        //write code to move cursor back [x] amount of spaces. [x] is the data-val value.
        
        
	});
    
    
    
    
    
        
});