From 2204e6c64e0042e0b937cf7d42e07816608e0234 Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Sun, 25 Oct 2020 18:32:24 +0000
Subject: [PATCH] generate valid block html for commonmark spec

---
 src/editor/serialize.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/editor/serialize.ts b/src/editor/serialize.ts
index f31dd67ae7..bd7845315e 100644
--- a/src/editor/serialize.ts
+++ b/src/editor/serialize.ts
@@ -52,13 +52,17 @@ export function htmlSerializeIfNeeded(model: EditorModel, {forceHTML = false} =
 
         md = md.replace(RegExp(displayPattern, "gm"), function(m, p1) {
             const p1e = AllHtmlEntities.encode(p1);
-            return `<div data-mx-maths="${p1e}"></div>`;
+            return `<div data-mx-maths="${p1e}">\n\n</div>\n\n`;
         });
 
         md = md.replace(RegExp(inlinePattern, "gm"), function(m, p1) {
             const p1e = AllHtmlEntities.encode(p1);
             return `<span data-mx-maths="${p1e}"></span>`;
         });
+
+        // make sure div tags always start on a new line, otherwise it will confuse
+        // the markdown parser
+        md = md.replace(/(.)<div/g, function(m, p1) { return `${p1}\n<div`; });
     }
 
     const parser = new Markdown(md);