code: func (engine *Engine) LoadHTMLFiles(files ...string) {
  	if IsDebugging() {
  		engine.HTMLRender = render.HTMLDebug{Files: files, FuncMap: engine.FuncMap, Delims: engine.delims}
  		return
  	}
  
  	templ := template.Must(template.New("").Delims(engine.delims.Left, engine.delims.Right).Funcs(engine.FuncMap).ParseFiles(files...))
  	engine.SetHTMLTemplate(templ)
  }
docs: // LoadHTMLFiles loads a slice of HTML files
  // and associates the result with HTML renderer.