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HTML 

              
                <!DOCTYPE html>
<html>

  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.18.0/codemirror.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.18.0/addon/mode/overlay.js"></script>
    <script src="https://raw.githack.com/kofifus/Typo.js/868c61bed1d1913fae8319e42e61e80fc50e56f3/typo/typo.js"></script>
    <script title="loadTypo.js">
"use strict";

// https://github.com/cfinke/Typo.js/pull/50

// loadTypo returns a promise resolved when the given dictionaries are loaded
function loadTypo(affPath, dicPath) {
	return new Promise(function(resolve, reject) {
		var xhr_aff = new XMLHttpRequest();
		xhr_aff.open('GET', affPath, true);
		xhr_aff.onload = function() {
			if (xhr_aff.readyState === 4 && xhr_aff.status === 200) {
				//console.log('aff loaded');
				var xhr_dic = new XMLHttpRequest();
				xhr_dic.open('GET', dicPath, true);
				xhr_dic.onload = function() {
					if (xhr_dic.readyState === 4 && xhr_dic.status === 200) {
						//console.log('dic loaded');
						resolve(new Typo('en_US', xhr_aff.responseText, xhr_dic.responseText, { platform: 'any' }));
					} else {
						//console.log('failed loading dic');
						reject();
					}
				};
				//console.log('loading dic');
				xhr_dic.send(null);
			} else {
				//console.log('failed loading aff');
				reject();
			}
		};
		//console.log('loading aff');
		xhr_aff.send(null);
	});
}
    </script>
    <script title="spell-checker.js">
"use strict";

function startSpellCheck(cm, typo) {
	if (!cm || !typo) return; // sanity

	startSpellCheck.ignoreDict = {}; // dictionary of ignored words

	// Define what separates a word
	var rx_word = '!\'\"#$%&()*+,-./:;<=>?@[\\]^_`{|}~ ';

	cm.spellcheckOverlay = {
		token: function(stream) {
			var ch = stream.peek();
			var word = "";

			if (rx_word.includes(ch) || ch === '\uE000' || ch === '\uE001') {
				stream.next();
				return null;
			}

			while ((ch = stream.peek()) && !rx_word.includes(ch)) {
				word += ch;
				stream.next();
			}

			if (!/[a-z]/i.test(word)) return null; // no letters
			if (startSpellCheck.ignoreDict[word]) return null;
			if (!typo.check(word)) return "spell-error"; // CSS class: cm-spell-error
		}
	}
	cm.addOverlay(cm.spellcheckOverlay);

	// initialize the suggestion box
	let sbox = getSuggestionBox(typo);
	cm.getWrapperElement().oncontextmenu = (e => {
		e.preventDefault();
		e.stopPropagation();
		sbox.suggest(cm, e);
		return false;
	});
}

function getSuggestionBox(typo) {
	function sboxShow(cm, sbox, items, x, y, hourglass) {
		let selwidget = sbox.children[0];

		var isSafari = navigator.vendor && navigator.vendor.indexOf('Apple') > -1 &&  navigator.userAgent && !navigator.userAgent.match('CriOS');
		let separator=(!isSafari && (hourglass || items.length>0)); // separator line does not work well on safari

		let options = '';
		items.forEach(s => options += '<option value="' + s + '">' + s + '</option>');
		if (hourglass) options += '<option disabled="disabled">&nbsp;&nbsp;&nbsp;&#8987;</option>';
		if (separator) options += '<option style="min-height:1px; max-height:1px; padding:0; background-color: #000000;" disabled>&nbsp;</option>';
		options += '<option value="##ignoreall##">Ignore&nbsp;All</option>';

		let indexInParent=[].slice.call(selwidget.parentElement.children).indexOf(selwidget);
		selwidget.innerHTML=options;
		selwidget=selwidget.parentElement.children[indexInParent];
		
		let fontSize=window.getComputedStyle(cm.getWrapperElement(), null).getPropertyValue('font-size');
		selwidget.style.fontSize=fontSize;
		selwidget.size = selwidget.length;
		if (separator) selwidget.size--;
		selwidget.value = -1;

		// position widget inside cm
    let yOffset = 12;
		let cmrect = cm.getWrapperElement().getBoundingClientRect();
		sbox.style.left = x + 'px';
		sbox.style.top = (y - sbox.offsetHeight / 2 + yOffset) + 'px';
		let widgetRect = sbox.getBoundingClientRect();
		if (widgetRect.top < cmrect.top) sbox.style.top = (cmrect.top + 2 + yOffset) + 'px';
		if (widgetRect.right > cmrect.right) sbox.style.left = (cmrect.right - widgetRect.width - 2) + 'px';
		if (widgetRect.bottom > cmrect.bottom) sbox.style.top = (cmrect.bottom - widgetRect.height - 2 + yOffseet) + 'px';
	}

	function sboxHide(sbox) {
		sbox.style.top = sbox.style.left = '-1000px';
		typo.suggest(); // disable any running suggeations search
	}

	// create suggestions widget
	let sbox = document.getElementById('suggestBox');
	if (!sbox) {
		sbox = document.createElement('div');
		sbox.style.zIndex = 100000;
		sbox.id = 'suggestBox';
		sbox.style.position = 'fixed';
		sboxHide(sbox);

		let selwidget = document.createElement('select');
		selwidget.multiple = 'yes';
		sbox.appendChild(selwidget);

		sbox.suggest = ((cm, e) => { // e is the event from cm contextmenu event
			if (!e.target.classList.contains('cm-spell-error')) return false; // not on typo

			let token = e.target.innerText;
			if (!token) return false; // sanity

			// save cm instance, token, token coordinates in sbox
			sbox.codeMirror = cm;
			sbox.token = token;
			sbox.screenPos={ x: e.pageX, y: e.pageY }
			let tokenRect = e.target.getBoundingClientRect();
			let start=cm.coordsChar({left: tokenRect.left+1, top: tokenRect.top+1});
			let end=cm.coordsChar({left: tokenRect.right-1, top: tokenRect.top+1});
			sbox.cmpos={ line: start.line, start: start.ch, end: end.ch};

			// show hourglass
			sboxShow(cm, sbox, [], e.pageX, e.pageY, true);

			var results = [];
			// async 
			typo.suggest(token, null, all => {
				//console.log('done');
				sboxShow(cm, sbox, results, e.pageX, e.pageY);
			}, next => {
				//console.log('found '+next);
				results.push(next);
				sboxShow(cm, sbox, results, e.pageX, e.pageY, true);
			});

			// non async 
			//sboxShow(cm, sbox, typo.suggest(token), e.pageX, e.pageY);

			e.preventDefault();

			return false;
		});

		sbox.onmouseout = (e => {
			let related=(e.relatedTarget ? e.relatedTarget.tagName : null);
			if (related!=='SELECT' && related!=='OPTION') sboxHide(sbox)
		});

		selwidget.onchange = (e => {
			sboxHide(sbox)
			let cm = sbox.codeMirror, correction = e.target.value;
			if (correction == '##ignoreall##') {
				startSpellCheck.ignoreDict[sbox.token] = true;
				cm.setOption('maxHighlightLength', (--cm.options.maxHighlightLength) + 1); // ugly hack to rerun overlays
			} else {
				cm.replaceRange(correction, { line: sbox.cmpos.line, ch: sbox.cmpos.start}, { line: sbox.cmpos.line, ch: sbox.cmpos.end});
				cm.focus();
				cm.setCursor({line: sbox.cmpos.line, ch: sbox.cmpos.start+correction.length});
			}
		});

		document.body.appendChild(sbox);
	}

	return sbox;
}
    </script>
    
  	<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.18.0/codemirror.css">
    <link rel="stylesheet" href="style.css">

    <style>
      .CodeMirror { border: 1px solid ; height: 150px; width: 300px; margin-left:30px; }
    </style>

  </head>
  
  <body>
    <h1>Codemirror spellchecker typo</h1>
    wait for dicts to load ...
    use right click to correct typos
    <br><br>
    <textarea id="ta1"></textarea>
    <br><br>
    <textarea id="ta2"></textarea>
    
    <script>
      // loading typo + dicts takes a while so we start it first
    	// hosting the dicts on your local domain will give much faster loading time
    	// english dictionaries taken from https://github.com/cfinke/Typo.js/pull/47
    	// get other dictionaries with git clone https://chromium.googlesource.com/chromium/deps/hunspell_dictionaries
    	const aff = 'https://cdn.rawgit.com/kofifus/Typo.js/312bf158a814dda6eac3bd991e3a133c84472fc8/typo/dictionaries/en_US/en_US.aff';
    	const dic = 'https://cdn.rawgit.com/kofifus/Typo.js/312bf158a814dda6eac3bd991e3a133c84472fc8/typo/dictionaries/en_US/en_US.dic';
      let typoLoaded=loadTypo(aff, dic);
      
      // initialize app and cms
      var cm1 = CodeMirror.fromTextArea(document.getElementById('ta1'), {lineWrapping:true});
      cm1.setValue('In a holle in the ground there lived a 1/1/2016 10:45 hobbbit. Not a nashty, dirty, wet hole, filled with the ends of woxrms and an oozy smell, nor yet a dry, bere, sandy hole with notuhing in it to sit down on or to eat: itt was a hobbit-hole and that means comfort.\nIt had a perfectly roundd door like a porthole, painted green, with a shiny yellow brass knoob in the exact middle. The door opened on to a tube-shaped hall like a tunnel; a veryy comfortable tunnel without smoke, with panelled walls, and floors tiled and carpeted, provided with polished chairrs, and lots and lots of pegs for hats and coats - the hobbit was fond of visitors.');

      var cm2 = CodeMirror.fromTextArea(document.getElementById('ta2'));
      var text='';
      for (let i=0; i<30; i++) text+='correct tyypo tyypo tyypo tyypo tyypo tyypo tyypo tyypo \n';
      cm2.setValue(text);
      
      
      // start spellchecking
      typoLoaded.then(typo => startSpellCheck(cm1, typo));
      typoLoaded.then(typo => startSpellCheck(cm2, typo));
    </script>
  </body>

</html>
!

CSS 

              
                .CodeMirror .cm-spell-error { 
	background-image: url("https://raw.githubusercontent.com/jwulf/typojs-project/master/public/images/red-wavy-underline.gif");
	background-position: bottom;
	background-repeat: repeat-x;
}

#suggestBox {
  display:inline-block; overflow:hidden; border:solid black 1px;
  box-shadow: 5px 5px 5px black;
}

#suggestBox > select {
  padding:10px; padding-left: 0; margin:-5px -20px -5px -5px;
}

#suggestBox > select > option {
  padding-left: 1em;
  padding-right: 2em;
}

#suggestBox > select > option:hover {
  box-shadow: 0 0 10px 100px #4A8CF7 inset; color: white;
}
!

JS
!
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