JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://knockoutjs.com/downloads/knockout-2.3.0.debug.js"></script>
<input id="txtSampleSize" name="txtSampleSize" type="text" size="5" maxlength="6" title="hello" data-bind="toolTip: { content: 'hello hello', disabled: false }"/>

JavaScript

ko.bindingHandlers.toolTip = {
    init: function (element, valueAccessor) {
        $(element).tooltip(valueAccessor());
    }
};

ko.applyBindings({});