Method: Prevents sending a 404 status when returning the response for the customize preview, since it causes the jQuery Ajax to fail. Send 200 instead.
Source: wp-includes/class-wp-customize-manager.php:2014
Method: Handles customize_save WP Ajax request to save/update a changeset.
Source: wp-includes/class-wp-customize-manager.php:2421
Action Hook: Announces when any setting’s unsanitized post value has been set.
Source: wp-includes/class-wp-customize-manager.php:1885
Method: Callback to validate a theme once it is loaded
Source: wp-includes/class-wp-customize-manager.php:654
Method: Finds the changeset post ID for a given changeset UUID.
Source: wp-includes/class-wp-customize-manager.php:977
Method: Prints base element for preview frame.
Source: wp-includes/class-wp-customize-manager.php:2024
Method: Saves the post for the loaded changeset.
Source: wp-includes/class-wp-customize-manager.php:2630
Action Hook: Fires once the Customizer preview has initialized and JavaScript settings have been printed.
Source: wp-includes/class-wp-customize-manager.php:1946
Method: If the theme to be previewed isn’t the active theme, add filter callbacks to swap it out at runtime.
Source: wp-includes/class-wp-customize-manager.php:668
Method: Gets changeset posts.
Source: wp-includes/class-wp-customize-manager.php:1022