I recently started to customize one of your themes, Meola. I created a child theme and started to add my scripts to wp_enqueue_script. In addition I deregistred WordPress and replaced it with a CDN version.

After the changes, the the scripts you have implemended didn’t work longer because they got loaded before jQuery.
When I opened your functions.php I saw you didn’t added the jQuery dependency reference to your wp_enqueue_script lines. So all the jQuery plugins you added have no dependency to jQuery.

To solve such problems, you should add the dependency to jQuery like this, which should fix such problems:


		wp_enqueue_script( 'fitvids', get_template_directory_uri() . '/js/jquery.fitvids.js', array('jquery'), '1.1');
		wp_enqueue_script( 'placeholder', get_template_directory_uri() . '/js/jquery.placeholder.min.js', array('jquery'), '1.0');
		wp_enqueue_script( 'custom', get_template_directory_uri() . '/js/custom.js', array('jquery'), '1.0');

I would change it my own make a pull request but I couldn’t find any public repositories to your themes.

Best