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If you are web designer or developer and if you are sell your works on Envato, I think this plugin ideal and very important for you. So, you can show your WordPress themes, Joomla templates or HTML templates with our awesome FBar demo bar plugin. This is a demo bar would be shown on top of page, allow users to preview another theme. The demo bar is customisable at style.css
Demo: https://codecanyon.net/item/fbar-responsive-php-theme-switcher-demo-bar/5045579