diff --git a/lib/loofah/html5/safelist.rb b/lib/loofah/html5/safelist.rb
index 142751f..d4f2c35 100644
--- a/lib/loofah/html5/safelist.rb
+++ b/lib/loofah/html5/safelist.rb
@@ -148,6 +148,7 @@ module SafeList
                                   "annotation-xml",
                                   "maction",
                                   "math",
+                                  "menclose",
                                   "merror",
                                   "mfenced",
                                   "mfrac",
@@ -161,6 +162,7 @@ module SafeList
                                   "mprescripts",
                                   "mroot",
                                   "mrow",
+                                  "ms",
                                   "mspace",
                                   "msqrt",
                                   "mstyle",
@@ -313,6 +315,7 @@ module SafeList
                                     "columnspacing",
                                     "columnspan",
                                     "depth",
+                                    "dir",
                                     "display",
                                     "displaystyle",
                                     "encoding",
@@ -323,19 +326,24 @@ module SafeList
                                     "fontweight",
                                     "frame",
                                     "height",
+                                    "href",
                                     "linethickness",
+                                    "lquote",
                                     "lspace",
                                     "mathbackground",
                                     "mathcolor",
+                                    "mathsize",
                                     "mathvariant",
                                     "maxsize",
                                     "minsize",
+                                    "notation",
                                     "open",
                                     "other",
                                     "rowalign",
                                     "rowlines",
                                     "rowspacing",
                                     "rowspan",
+                                    "rquote",
                                     "rspace",
                                     "scriptlevel",
                                     "selection",