is_customize_preview() WordPress Function

function is_customize_preview() {
	global $wp_customize;

	return ( $wp_customize instanceof WP_Customize_Manager ) && $wp_customize->is_preview();
}
Used By	Description
wp-includes/widgets/class-wp-widget-text.php:WP_Widget_Text::render_control_template_scripts()	Render form template scripts.
wp-includes/theme.php:wp_custom_css_cb()	Renders the Custom CSS style element.
wp-includes/theme.php:get_custom_header_markup()	Retrieves the markup for a custom header.
wp-includes/theme.php:the_custom_header_markup()	Prints the markup for a custom header.
wp-includes/general-template.php:get_custom_logo()	Returns a custom logo, linked to home unless the theme supports removing the link on the home page.
wp-includes/customize/class-wp-customize-selective-refresh.php:WP_Customize_Selective_Refresh::handle_render_partials_request()	Handles the Ajax request to return the rendered partials for the requested placements.
wp-includes/admin-bar.php:wp_admin_bar_customize_menu()	Adds the “Customize” link to the Toolbar.
wp-includes/general-template.php:wp_site_icon()	Display site icon meta tags.
wp-includes/theme.php:_custom_background_cb()	Default custom background callback.
wp-includes/widgets/class-wp-widget-recent-comments.php:WP_Widget_Recent_Comments::__construct()	Sets up a new Recent Comments widget instance.
wp-includes/nav-menu-template.php:_wp_menu_item_classes_by_context()	Adds the class property classes for the current context, if applicable.