WordPress at a glance
action is not described

customize_render_partials_after action-hook . WP 4.5.0

Fires immediately after partials are rendered.

Plugins may do things like call wp_footer() to scrape scripts output and return them via the 'customize_render_partials_response' filter.

Usage

add_action( 'customize_render_partials_after', 'action_function_name_6043', 10, 2 );
function action_function_name_6043( $this, $partials ){
	// action...
}
$this(WP_Customize_Selective_Refresh)
Selective refresh component.
$partials(array)
Placements' context data for the partials rendered in the request. The array is keyed by partial ID, with each item being an array of the placements' context data.

Where the hook is called

WP_Customize_Selective_Refresh::handle_render_partials_request()
wp-includes/customize/class-wp-customize-selective-refresh.php 408
do_action( 'customize_render_partials_after', $this, $partials );

Where the hook is used (in WP core)

Does not used.