diff --git a/src/Entities.php b/src/Entities.php
index 8d3f0d7..f943b3f 100644
--- a/src/Entities.php
+++ b/src/Entities.php
@@ -316,6 +316,9 @@ private static function parseNode(DOMNode|DOMText $node, int $offset, string &$m
             'pre' => $node->hasAttribute('language')
                 ? ['type' => 'pre', 'language' => $node->getAttribute('language')]
                 : ['type' => 'pre'],
+            'span' => $node->hasAttribute('class') && $node->getAttribute('class') === 'tg-spoiler'
+                    ? ['type' => 'spoiler']
+                    : null,
             'tg-emoji' => ['type' => 'custom_emoji', 'custom_emoji_id' => (int) $node->getAttribute('emoji-id')],
             'emoji' => ['type' => 'custom_emoji', 'custom_emoji_id' => (int) $node->getAttribute('id')],
             'a' => self::handleLink($node->getAttribute('href')),
@@ -384,7 +387,7 @@ public function toHTML(bool $allowTelegramTags = false): string
                 "email" => '<a href="mailto:'.EntityTools::htmlEscape(EntityTools::mbSubstr($this->message, $offset, $length)).'">',
                 "phone" => '<a href="phone:'.EntityTools::htmlEscape(EntityTools::mbSubstr($this->message, $offset, $length)).'">',
                 "mention" => '<a href="https://t.me/'.EntityTools::htmlEscape(EntityTools::mbSubstr($this->message, $offset+1, $length-1)).'">',
-                "spoiler" => $allowTelegramTags ? '<tg-spoiler>' : '',
+                "spoiler" => $allowTelegramTags ? '<tg-spoiler>' : '<span class="tg-spoiler">',
                 "custom_emoji" => $allowTelegramTags ? '<tg-emoji emoji-id="'.$entity['custom_emoji_id'].'">' : '',
                 "text_mention" => $allowTelegramTags ? '<a href="tg://user?id='.$entity['user']['id'].'">' : '',
                 default => '',
@@ -400,7 +403,7 @@ public function toHTML(bool $allowTelegramTags = false): string
                 "strikethrough" => '</s>',
                 "underline" => '</u>',
                 "block_quote" => '</blockquote>',
-                "spoiler" => $allowTelegramTags ? '</tg-spoiler>' : '',
+                "spoiler" => $allowTelegramTags ? '</tg-spoiler>' : '</span>',
                 "custom_emoji" => $allowTelegramTags ? "</tg-emoji>" : '',
                 "text_mention" => $allowTelegramTags ? '</a>' : '',
                 default => '',
diff --git a/tests/EntitiesTest.php b/tests/EntitiesTest.php
index 6922d62..1ba6213 100644
--- a/tests/EntitiesTest.php
+++ b/tests/EntitiesTest.php
@@ -262,7 +262,7 @@ public static function provideHtmlEntities(): iterable
         yield [
             'test',
             '<tg-spoiler>test</tg-spoiler>',
-            'test',
+            '<span class="tg-spoiler">test</span>',
             [[
                 'type' => 'spoiler',
                 'offset' => 0,
@@ -618,6 +618,19 @@ private function provideEntities(): array
                 ],
                 '<b>&apos;&quot;</b>',
             ],
+            [
+                'html',
+                '<span class="tg-spoiler">spoiler</span>',
+                'spoiler',
+                [
+                    [
+                        'offset' => 0,
+                        'length' => 7,
+                        'type' => 'spoiler',
+                    ],
+                ],
+                '<tg-spoiler>spoiler</tg-spoiler>',
+            ],
             [
                 'html',
                 '<a href="mention:101374607">mention1</a> <a href="tg://user?id=101374607">mention2</a>',