diff --git a/EnglishPal b/EnglishPal
new file mode 160000
index 0000000..8cbc7c9
--- /dev/null
+++ b/EnglishPal
@@ -0,0 +1 @@
+Subproject commit 8cbc7c9a0ce543db48f80a743c4168ca847ca500
diff --git a/app/templates/userpage_get.html b/app/templates/userpage_get.html
index 0488aea..f6ed768 100644
--- a/app/templates/userpage_get.html
+++ b/app/templates/userpage_get.html
@@ -255,6 +255,7 @@
                     update(data['today_article']);
                     check_pre(data['visited_articles']);
                     check_next(data['result_of_generate_article']);
+                    toggleHighlighting();
                 }
             }, complete: function (xhr, status) {
                 $("#load_next_article").prop("disabled", false)
@@ -271,6 +272,7 @@
                 if (data['today_article']) {
                     update(data['today_article']);
                     check_pre(data['visited_articles']);
+                    toggleHighlighting();
                 }
             }
         });
diff --git a/app/test/conftest.py b/app/test/conftest.py
index 29f6431..af17368 100644
--- a/app/test/conftest.py
+++ b/app/test/conftest.py
@@ -9,5 +9,5 @@ def URL():
 
 @pytest.fixture
 def driver():
-    my_driver = webdriver.Edge()  # uncomment this line if you wish to run the test on your laptop    
+    my_driver = webdriver.Chrome()
     return my_driver
diff --git a/app/test/test_bug555_fangchen.py b/app/test/test_bug555_fangchen.py
new file mode 100644
index 0000000..d1edfb5
--- /dev/null
+++ b/app/test/test_bug555_fangchen.py
@@ -0,0 +1,43 @@
+import time
+import pytest
+import uuid
+from selenium import webdriver
+from selenium.webdriver import ActionChains
+from selenium.webdriver.common.by import By
+from selenium.webdriver.support.ui import WebDriverWait
+from selenium.webdriver.support import expected_conditions as EC
+from selenium.common.exceptions import UnexpectedAlertPresentException, NoAlertPresentException, NoSuchElementException, \
+    TimeoutException
+from conftest import URL
+driver = webdriver.Chrome()
+def test_bug555():
+    try:
+        driver.maximize_window()
+        base_url = "http://127.0.0.1:5000"
+        driver.get(base_url)
+        article = WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.ID, 'article')))
+        perform_actions_on_article(driver, article)
+
+        next_button = WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.ID, 'load_next_article')))
+        next_button.click()
+        print("Clicked next article button.")
+
+        prev_button = WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.ID, 'load_pre_article')))
+        prev_button.click()
+        print("Clicked previous article button.")
+
+    except (TimeoutException, NoSuchElementException) as e:
+        print(f"An error occurred: {e}")
+
+    finally:
+        driver.quit()
+        print("Driver closed.")
+
+def perform_actions_on_article(driver, article):
+    actions = ActionChains(driver)
+    actions.move_to_element(article)
+    actions.click_and_hold()
+    actions.move_by_offset(450, 200)
+    actions.release()
+    actions.perform()
+    print("Performed actions on article.")
\ No newline at end of file
diff --git a/mintty.2024-06-04_11-12-32.png b/mintty.2024-06-04_11-12-32.png
new file mode 100644
index 0000000..72ccafe
Binary files /dev/null and b/mintty.2024-06-04_11-12-32.png differ