JSFiddle - React, Tailwind, and code Playground

HTML

Nombre: <input type="text" data-bind="value: Nombre" /><br />
Primer apellido <input type="text" data-bind="value: PrimerApellido" /><br />

JavaScript

function ViewModel() {
    this.Nombre = "John";
    this.PrimerApellido= "Doe";
}

// Activates knockout.js
ko.applyBindings(new ViewModel());