JSFiddle - React, Tailwind, and code Playground

HTML

<div data-bind="foreach: data"> 

    <!-- ko if: ($index() > 9 && $index() < 20)  -->
    test <span data-bind="text: $index()"></span> 
    <!-- /ko -->
</div>

JavaScript

var vm = function () {
    var self = this;
    self.data = ko.observableArray([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]);
}

var s = new vm();

ko.applyBindings(s);