JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://raw.github.com/documentcloud/underscore/master/underscore-min.js"></script>
<script src="https://raw.github.com/documentcloud/backbone/master/backbone-min.js"></script>
<div class="parent"></div>

JavaScript

var ParentView = Backbone.View.extend({
    render : function() {
        var html='<h1>Parent View</h1><div class="productInfo"></div><div class="prices"></div><div class="photos"></div>';
        this.$el.html(html);

        var prices = new PricesView({
            el : this.$('.prices')
        });
        prices.render();
    }
});

var PricesView = Backbone.View.extend({
    render : function() {
        var html='<h2>Prices View</h1>';
        this.$el.html(html);
    }
});

var parent = new ParentView({
    el : $('.parent')
});

parent.render();