Convert div to table (width, border, bgcolor in attr)

src/epub_converter/html_epub_preprocessor.py

@@ -276,7 +276,7 @@ def _preprocess_div_tags(chapter_tag):
     Function replace <div> with <table>:
     """
     for div in chapter_tag.find_all("div"):
-        if div.attrs.get('style'):
+        if any(attr in ['width', 'border', 'bgcolor'] for attr in div.attrs):
             _wrap_tag_with_table(
                 chapter_tag,
                 tag_to_be_wrapped=div,