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 57461c1..88cfdd6 100644
--- a/app/templates/userpage_get.html
+++ b/app/templates/userpage_get.html
@@ -232,6 +232,7 @@
                     update(data['today_article']);
                     check_pre(data['visited_articles']);
                     check_next(data['result_of_generate_article']);
+                    toggleHighlighting();
                 }
             }
         });
@@ -245,6 +246,7 @@
                 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 ed4186c..aefb718 100644
--- a/app/test/conftest.py
+++ b/app/test/conftest.py
@@ -12,24 +12,5 @@ def URL():
 
 @pytest.fixture
 def driver():
-    return webdriver.Edge()  # follow the "End-to-end testing" section in README.md to install the web driver executable
-
-
-@pytest.fixture
-def restore_sqlite_database():
-    '''
-    Automatically restore SQLite database file app/db/wordfreqapp.db
-    using SQL statements from app/static/wordfreqapp.sql
-    '''
-    con = sqlite3.connect('../db/wordfreqapp.db')
-    with con:
-        con.executescript('DROP TABLE IF EXISTS user;')
-        con.executescript('DROP TABLE IF EXISTS article;')
-        con.executescript(open('../static/wordfreqapp.sql', encoding='utf8').read())
-    con.close()
-
-
-@pytest.fixture(autouse=True)
-def restart_englishpal(restore_sqlite_database):
-    (Path(__file__).parent / '../main.py').touch()
-    time.sleep(1)
+    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