JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" data-bind="value:someText, valueUpdate:['afterkeydown','propertychange','input']" />
<span data-bind="text:someText"></span>

JavaScript

function MyModel(){
    var self =  this;
    
    self.someText = ko.observable();
}

ko.applyBindings(new MyModel());