er", "tutorial_quiz_answer"))), button_labels = list(submit = structure("Submit Answer", html = TRUE, class = c("html", "character")), try_again = structure("Try Again", html = TRUE, class = c("html", "character"))), messages = list(correct = structure("Correct!", html = TRUE, class = c("html", "character")), try_again = structure("Incorrect", html = TRUE, class = c("html", "character")), incorrect = structure("Incorrect", html = TRUE, class = c("html", "character")), message = NULL, post_message = NULL), i