fault 'half')
* @param {image=} background image url (relative to smartVISU directory or absolute); optimal size is 100px x 180px (optional)
*
* @see misc/fundamentals#Items
*
* @info inspired by Jörg Gutowski
*/
{% macro shutter(id, item_pos, item_angle, value_top, value_bottom, step, mode, background) %}
	{% import "@widgets/lib.html" as lib %}
	<div{% if not id is empty %} id="{{ uid(page, id) }}"{% endif %} data-widget="basic.shutter" data-item="{{ item_pos }}, {{ item_angle }}"
		data-min="{{ value_to