From e9fd38fc02157f318576fe55b34d64cb5422a35c Mon Sep 17 00:00:00 2001
From: Darskiy <sergorgen@gmail.com>
Date: Tue, 11 Mar 2025 02:41:47 +0200
Subject: [PATCH] Enhance HTML tag support for existing entities

Added `details` tag handling for the existing `MessageEntitySpoiler` entity. Expanded `MessageEntityStrike` detection by including the `strike` tag.
---
 telethon/extensions/html.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/telethon/extensions/html.py b/telethon/extensions/html.py
index 0e2e8f33..45ee3c01 100644
--- a/telethon/extensions/html.py
+++ b/telethon/extensions/html.py
@@ -13,7 +13,7 @@ from ..tl.types import (
     MessageEntityPre, MessageEntityEmail, MessageEntityUrl,
     MessageEntityTextUrl, MessageEntityMentionName,
     MessageEntityUnderline, MessageEntityStrike, MessageEntityBlockquote,
-    TypeMessageEntity
+    TypeMessageEntity, MessageEntitySpoiler
 )
 
 
@@ -39,8 +39,10 @@ class HTMLToTelegramParser(HTMLParser):
             EntityType = MessageEntityItalic
         elif tag == 'u':
             EntityType = MessageEntityUnderline
-        elif tag == 'del' or tag == 's':
+        elif tag in ('del', 's', 'strike'):
             EntityType = MessageEntityStrike
+        elif tag == 'details':
+            EntityType = MessageEntitySpoiler
         elif tag == 'blockquote':
             EntityType = MessageEntityBlockquote
         elif tag == 'code':
@@ -131,6 +133,7 @@ def parse(html: str) -> Tuple[str, List[TypeMessageEntity]]:
 ENTITY_TO_FORMATTER = {
     MessageEntityBold: ('<strong>', '</strong>'),
     MessageEntityItalic: ('<em>', '</em>'),
+    MessageEntitySpoiler: ('<details>', '</details>'),
     MessageEntityCode: ('<code>', '</code>'),
     MessageEntityUnderline: ('<u>', '</u>'),
     MessageEntityStrike: ('<del>', '</del>'),