WP_Customize_Manager::get_previewable_devices()

	public function get_previewable_devices() {
		$devices = array(
			'desktop' => array(
				'label' => __( 'Enter desktop preview mode' ),
				'default' => true,
			),
			'tablet' => array(
				'label' => __( 'Enter tablet preview mode' ),
			),
			'mobile' => array(
				'label' => __( 'Enter mobile preview mode' ),
			),
		);

		/**
		 * Filters the available devices to allow previewing in the Customizer.
		 *
		 * @since WP-4.5.0
		 *
		 * @see WP_Customize_Manager::get_previewable_devices()
		 *
		 * @param array $devices List of devices with labels and default setting.
		 */
		$devices = apply_filters( 'customize_previewable_devices', $devices );

		return $devices;
	}