diff --git a/js/htmlescape.js b/js/htmlescape.js
index a95c84b..824a302 100644
--- a/js/htmlescape.js
+++ b/js/htmlescape.js
@@ -8,7 +8,9 @@ const esca = {
 '<': '&lt;',
 '>': '&gt;',
 "'": '&#39;',
-'"': '&quot;'
+'"': '&quot;',
+'\\': '\\\\',
+'`': '\\`'
 };
 const pe = m => esca[m];
 
@@ -26,7 +28,9 @@ const unes = {
 '&apos;': "'",
 '&#39;': "'",
 '&quot;': '"',
-'&#34;': '"'
+'&#34;': '"',
+'\\\\': '\\',
+'\\`': '`'
 };
 const cape = m => unes[m];