JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://github.com/downloads/SteveSanderson/knockout/knockout-1.2.1.js"></script>
<div data-bind="html: content"></div>

<button data-bind="click: function(){ viewModel.save() }">Save It</button>

JavaScript

var viewModel = {
   
    content: ko.observable("<h3>Test</h3"),
    save: function() {
        alert("sending to console");
        console.log(ko.toJSON(viewModel));
    }
}

$(function() {
    ko.applyBindings(viewModel);
   $("#content").html("<h4>Test</h4>");
    ko.applyBindings(viewModel,document.getElementById('content'));

});