From e05f02f435a205cd1ae4e16b0666e2c520655d33 Mon Sep 17 00:00:00 2001
From: Rust Saiargaliev <fly.amureki@gmail.com>
Date: Mon, 2 Feb 2026 16:47:14 +0100
Subject: [PATCH] Ref #1590 -- Add regression test for MSO conditional comments
 bug

---
 tests/test_syntax/blocks/test_html_blocks.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/test_syntax/blocks/test_html_blocks.py b/tests/test_syntax/blocks/test_html_blocks.py
index 406de997..294bcff2 100644
--- a/tests/test_syntax/blocks/test_html_blocks.py
+++ b/tests/test_syntax/blocks/test_html_blocks.py
@@ -1706,3 +1706,10 @@ def test_no_hang_issue_1586(self):
             'Test `<!--[if mso]>` and `<!--[if !mso]>`',
             '<p>Test <code>&lt;!--[if mso]&gt;</code> and <code>&lt;!--[if !mso]&gt;</code></p>'
         )
+
+    def test_mso_conditional_comments_truncate_table_content(self):
+        """Content after MSO conditional comments should not be truncated."""
+        self.assertMarkdownRenders(
+            '<table>\n<!--[if mso]>-->\n<td>keep</td>\n<!--<![endif]-->\n<td>also keep</td>\n</table>\n',
+            '<table>\n<!--[if mso]>-->\n<td>keep</td>\n<!--<![endif]-->\n<td>also keep</td>\n</table>'
+        )