diff --git a/pyrogram/client/parser/html.py b/pyrogram/client/parser/html.py
index 9aff757f..41efe3b3 100644
--- a/pyrogram/client/parser/html.py
+++ b/pyrogram/client/parser/html.py
@@ -86,7 +86,8 @@ class Parser(HTMLParser):
 
         for entities in self.tag_entities.values():
             for entity in entities:
-                entity.length += len(data)
+                entity.offset += len(data) - len(data.lstrip())  # Ignore left whitespaces for offsets
+                entity.length += len(data.strip())  # Ignore all whitespaces (left + right) for lengths
 
         self.text += data