diff --git a/test/test_parsing.py b/test/test_parsing.py
index a7e7ec7d46..0e006298f7 100644
--- a/test/test_parsing.py
+++ b/test/test_parsing.py
@@ -345,7 +345,7 @@ def mark_comments(_string, char='^', nochar='-'):
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         here   is   <!-- a comment -->   and   <!-- another comment -->   end
         ----------------^^^^^^^^^^^----------------^^^^^^^^^^^^^^^^^---------
-        <script> ignore here </script>            <script> and here </script>
+        <script> ignore here </script>            <SCRIPT> and here </SCRIPT>
         --------^^^^^^^^^^^^^-----------------------------^^^^^^^^^^---------
         '''
 
diff --git a/yt_dlp/parsing.py b/yt_dlp/parsing.py
index 256ba8e6c7..f4aaf1ac4f 100644
--- a/yt_dlp/parsing.py
+++ b/yt_dlp/parsing.py
@@ -20,7 +20,7 @@ class HTMLIgnoreRanges:
             if offset in ranges:
                 ...
     """
-    REGEX = re.compile(r'<!--|-->|</?\s*(?:script|style)\b[^>]*>')
+    REGEX = re.compile(r'<!--|-->|</?\s*(?:script|style)\b[^>]*>', flags=re.IGNORECASE)
 
     def __init__(self, html):
         self.html = html