This plugin allows you to add custom JavaScript code, CSS custom styles and HTML markup to your WordPress site separately. With the powerful filter editor you can create complex rules. They are convenient to use when you want to include your custom code for a specific url, post, page, device, os, browser, also it will be useful to execute js or css at a concrete date, time, day of week and etc. It’s a good theme and plugin customizer and a perfect solution to create additional styles and js codes for your site.