<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def play_introjs_tour( driver, tour_steps, browser, msg_dur, name=None, interval=0):
 """ Plays an IntroJS tour on the current website. """

    instructions = ""
    for tour_step in tour_steps[name]:
        instructions += tour_step
    instructions += (
        """]
        });
        intro.setOption("disableInteraction", true);
        intro.setOption("overlayOpacity", .29);
        intro.setOption("scrollToElement", true);
        intro.setOption("keyboardNavigation", true);
        intro.setOption("exitOnEsc", false);
        intro.setOption("exitOnOverlayClick", false);
        intro.setOption("showStepNumbers", false);
        intro.setOption("showProgress", false);
        intro.start();
        $tour = intro;
        };
        // Start the tour
        startIntro();
        """)
    autoplay = False
    if interval and interval > 0:
        autoplay = True
        interval = float(interval)
        if interval < 0.5:
            interval = 0.5

    if not is_introjs_activated(driver):
        activate_introjs(driver)

    if len(tour_steps[name]) > 1:
        try:
            if "element: " in tour_steps[name][1]:
                selector = re.search(
                    r"[\S\s]+element: '([\S\s]+)',[\S\s]+intro: '",
                    tour_steps[name][1]).group(1)
                selector = selector.replace('\\', '')
                page_actions.wait_for_element_present(
                    driver, selector, by=By.CSS_SELECTOR,
                    timeout=settings.SMALL_TIMEOUT)
            else:
                selector = "html"
        except Exception:
            js_utils.post_messenger_error_message(
                driver, "Tour Error: {'%s'} was not found!" % selector,
                msg_dur)
            raise Exception(
                "Tour Error: {'%s'} was not found! "
                "Exiting due to failure on first tour step!"
                "" % selector)
    driver.execute_script(instructions)
    tour_on = True
    if autoplay:
        start_ms = time.time() * 1000.0
        stop_ms = start_ms + (interval * 1000.0)
        latest_step = 0
    while tour_on:
        try:
            time.sleep(0.01)
            if browser != "firefox":
                result = driver.execute_script(
                    "return $tour._currentStep")
            else:
                page_actions.wait_for_element_present(
                    driver, ".introjs-tooltip",
                    by=By.CSS_SELECTOR, timeout=0.4)
                result = True
        except Exception:
            tour_on = False
            result = None
        if result is not None:
            tour_on = True
            if autoplay:
                try:
                    current_step = driver.execute_script(
                        "return $tour._currentStep")
                except Exception:
                    continue
                if current_step != latest_step:
                    latest_step = current_step
                    start_ms = time.time() * 1000.0
                    stop_ms = start_ms + (interval * 1000.0)
                now_ms = time.time() * 1000.0
                if now_ms >= stop_ms:
                    if current_step == latest_step:
                        driver.execute_script("return $tour.nextStep()")
                        try:
                            latest_step = driver.execute_script(
                                "return $tour._currentStep")
                            start_ms = time.time() * 1000.0
                            stop_ms = start_ms + (interval * 1000.0)
                        except Exception:
                            pass
                        continue
        else:
            try:
                time.sleep(0.01)
                if browser != "firefox":
                    result = driver.execute_script(
                        "return $tour._currentStep")
                else:
                    page_actions.wait_for_element_present(
                        driver, ".introjs-tooltip",
                        by=By.CSS_SELECTOR, timeout=0.4)
                    result = True
                if result is not None:
                    time.sleep(0.1)
                    continue
                else:
                    return
            except Exception:
                tour_on = False
                time.sleep(0.1)