code: func (engine *Engine) SetHTMLTemplate(templ *template.Template) {
  	if len(engine.trees) > 0 {
  		debugPrintWARNINGSetHTMLTemplate()
  	}
  
  	engine.HTMLRender = render.HTMLProduction{Template: templ.Funcs(engine.FuncMap)}
  }
docs: // SetHTMLTemplate associate a template with HTML renderer.