I tested this code in Chrome and there seems to be a bug involving the newlines. I am reaching the maxlength before I actually use all the characters.
var ta = document.getElementById('myText');
document.getElementById('max').innerHTML = ta.maxLength;
setInterval(function() {
document.getElementById('count').innerHTML = ta.value.length;
}, 250);
<textarea id="myText" maxlength="200" style="width:70%;height:130px">
Lorem Ipsum is simply dummy text of the printing and typesetting industry.
Lorem Ipsum has been the industry's standard dummy text ever since the 1500s
Type more words here...
</textarea>
<div>
Char Count <span id="count">0</span>/<span id="max">0</span>
</div>
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