diff --git a/dom/base/FragmentOrElement.cpp b/dom/base/FragmentOrElement.cpp
index 06162b0e3ae..de073444108 100644
--- a/dom/base/FragmentOrElement.cpp
+++ b/dom/base/FragmentOrElement.cpp
@@ -2553,7 +2553,7 @@ IsVoidTag(nsIAtom* aTag)
   static const nsIAtom* voidElements[] = {
     nsGkAtoms::area, nsGkAtoms::base, nsGkAtoms::basefont,
     nsGkAtoms::bgsound, nsGkAtoms::br, nsGkAtoms::col,
-    nsGkAtoms::command, nsGkAtoms::embed, nsGkAtoms::frame,
+    nsGkAtoms::embed, nsGkAtoms::frame,
     nsGkAtoms::hr, nsGkAtoms::img, nsGkAtoms::input,
     nsGkAtoms::keygen, nsGkAtoms::link, nsGkAtoms::meta,
     nsGkAtoms::param, nsGkAtoms::source, nsGkAtoms::track,
diff --git a/dom/base/nsTreeSanitizer.cpp b/dom/base/nsTreeSanitizer.cpp
index ede76e9f654..88f038da099 100644
--- a/dom/base/nsTreeSanitizer.cpp
+++ b/dom/base/nsTreeSanitizer.cpp
@@ -53,7 +53,6 @@ nsIAtom** const kElementsHTML[] = {
   &nsGkAtoms::code,
   &nsGkAtoms::col,
   &nsGkAtoms::colgroup,
-  &nsGkAtoms::command,
   &nsGkAtoms::datalist,
   &nsGkAtoms::dd,
   &nsGkAtoms::del,
diff --git a/testing/web-platform/meta/html/syntax/serializing-html-fragments/outerHTML.html.ini b/testing/web-platform/meta/html/syntax/serializing-html-fragments/outerHTML.html.ini
deleted file mode 100644
index 30e64650581..00000000000
--- a/testing/web-platform/meta/html/syntax/serializing-html-fragments/outerHTML.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[outerHTML.html]
-  type: testharness
-  [Node for command]
-    expected: FAIL
-