template "widget[@type='Back']", mode="widget_defs" {
| on_click: function(evt) {
| if(jump_history.length > 1){
| let [page_name, index] = jump_history.pop();
| switch_page(page_name, index);
| this.element.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_click(evt)");