My example:
$(document).on('keyup', '[contenteditable=true]', function (e) {
let _this = $(this), text = _this.text();
if (text.length === 1) {
let span = $('<span>').text(text);
_this.html(span);
}
console.log(_this.html());
});
[contenteditable=true] {
border: 1px solid #ccc;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<div contenteditable="true"></div>
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