JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.0/knockout-debug.js"></script>
<ul data-bind="template: {name: 'test', foreach: items, afterRender: addRandomNumber}">
</ul>

<script type="text/html" id="test">
     <li data-bind="text: $data"></li>
</script>

JavaScript

function addRandomNumber(elements) {
	elements.forEach(function(element) {
  	element.innerHTML += "-> " + Math.random();
  })
}

ko.applyBindings({
	items: [1, 2, 3, 4, 5, 6],
  addRandomNumber: addRandomNumber
});