Update HMTL_SEQUENCES regexes as per CM 0.30 spec

Author: hukkin

markdown_it/rules_block/html_block.py

@@ -13,8 +13,8 @@
 # last argument defines whether it can terminate a paragraph or not
 HTML_SEQUENCES: List[Tuple[Pattern, Pattern, bool]] = [
     (
-        re.compile(r"^<(script|pre|style)(?=(\s|>|$))", re.IGNORECASE),
-        re.compile(r"<\/(script|pre|style)>", re.IGNORECASE),
+        re.compile(r"^<(script|pre|style|textarea)(?=(\s|>|$))", re.IGNORECASE),
+        re.compile(r"<\/(script|pre|style|textarea)>", re.IGNORECASE),
         True,
     ),
     (re.compile(r"^<!--"), re.compile(r"-->"), True),