diff --git a/source/Ox/js/HTML.js b/source/Ox/js/HTML.js
index cd4634a9..b4b0b530 100644
--- a/source/Ox/js/HTML.js
+++ b/source/Ox/js/HTML.js
@@ -4,7 +4,7 @@
 
     var defaultTags = [
             // inline formatting
-            'b', 'code', 'i', 's', 'sub', 'sup', 'u',
+            'b', 'code', 'em', 'i', 's', 'strong', 'sub', 'sup', 'u',
             // block formatting
             'blockquote', 'h1', 'h2', 'h3', 'p', 'pre',
             // lists