diff --git a/dom/imptests/failures/html/html/dom/documents/dta/test_document.body-getter.html.json b/dom/imptests/failures/html/html/dom/documents/dta/test_document.body-getter.html.json
index 391cfc34469b..ff4bfae0436b 100644
--- a/dom/imptests/failures/html/html/dom/documents/dta/test_document.body-getter.html.json
+++ b/dom/imptests/failures/html/html/dom/documents/dta/test_document.body-getter.html.json
@@ -1,6 +1,7 @@
 {
   "Frameset followed by body inside the html element": true,
   "Body followed by frameset inside a non-HTML html element": true,
+  "Frameset followed by body inside a non-HTML html element": true,
   "Frameset inside an x element followed by a frameset": true,
   "Frameset as the root node": true,
   "Body as the root node with a frameset child": true,
diff --git a/dom/imptests/failures/html/html/semantics/tabular-data/the-table-element/Makefile.in b/dom/imptests/failures/html/html/semantics/tabular-data/the-table-element/Makefile.in
index 4ea8cb30c748..8782fdb0fbd2 100644
--- a/dom/imptests/failures/html/html/semantics/tabular-data/the-table-element/Makefile.in
+++ b/dom/imptests/failures/html/html/semantics/tabular-data/the-table-element/Makefile.in
@@ -10,6 +10,7 @@ relativesrcdir := @relativesrcdir@
 include $(DEPTH)/config/autoconf.mk
 
 MOCHITEST_FILES := \
+  test_createTBody.html.json \
   test_table-insertRow.html.json \
   test_table-rows.html.json \
   $(NULL)
diff --git a/dom/imptests/failures/html/html/semantics/tabular-data/the-table-element/test_createTBody.html.json b/dom/imptests/failures/html/html/semantics/tabular-data/the-table-element/test_createTBody.html.json
new file mode 100644
index 000000000000..9460313273b1
--- /dev/null
+++ b/dom/imptests/failures/html/html/semantics/tabular-data/the-table-element/test_createTBody.html.json
@@ -0,0 +1,16 @@
+{
+  "No child nodes": true,
+  "One tbody child node": true,
+  "Two tbody child nodes": true,
+  "A thead and a tbody child node": true,
+  "A tfoot and a tbody child node": true,
+  "A tbody and a thead child node": true,
+  "A tbody and a tfoot child node": true,
+  "Two tbody child nodes and a div": true,
+  "One HTML and one namespaced tbody child node": true,
+  "Two nested tbody child nodes": true,
+  "A tbody node inside a thead child node": true,
+  "A tbody node inside a tfoot child node": true,
+  "A tbody node inside a thead child node after a tbody child node": true,
+  "A tbody node inside a tfoot child node after a tbody child node": true
+}
diff --git a/dom/imptests/html/html/dom/documents/dta/test_document.body-getter.html b/dom/imptests/html/html/dom/documents/dta/test_document.body-getter.html
index abdb4e37b664..3970065a0085 100644
--- a/dom/imptests/html/html/dom/documents/dta/test_document.body-getter.html
+++ b/dom/imptests/html/html/dom/documents/dta/test_document.body-getter.html
@@ -42,19 +42,17 @@ test(function() {
   var doc = createDocument();
   var html =
     doc.appendChild(doc.createElementNS("http://example.org/test", "html"));
-  var b =
-    html.appendChild(doc.createElement("body"));
+  html.appendChild(doc.createElement("body"));
   html.appendChild(doc.createElement("frameset"));
-  assert_equals(doc.body, b);
+  assert_equals(doc.body, null);
 }, "Body followed by frameset inside a non-HTML html element");
 test(function() {
   var doc = createDocument();
   var html =
     doc.appendChild(doc.createElementNS("http://example.org/test", "html"));
-  var f =
-    html.appendChild(doc.createElement("frameset"));
+  html.appendChild(doc.createElement("frameset"));
   html.appendChild(doc.createElement("body"));
-  assert_equals(doc.body, f);
+  assert_equals(doc.body, null);
 }, "Frameset followed by body inside a non-HTML html element");
 test(function() {
   var doc = createDocument();
diff --git a/dom/imptests/html/html/semantics/tabular-data/the-table-element/Makefile.in b/dom/imptests/html/html/semantics/tabular-data/the-table-element/Makefile.in
index efa73705e983..e0f7def25bb8 100644
--- a/dom/imptests/html/html/semantics/tabular-data/the-table-element/Makefile.in
+++ b/dom/imptests/html/html/semantics/tabular-data/the-table-element/Makefile.in
@@ -10,6 +10,7 @@ relativesrcdir := @relativesrcdir@
 include $(DEPTH)/config/autoconf.mk
 
 MOCHITEST_FILES := \
+  test_createTBody.html \
   test_insertRow-method-01.html \
   test_insertRow-method-02.html \
   test_table-insertRow.html \
diff --git a/dom/imptests/html/html/semantics/tabular-data/the-table-element/test_createTBody.html b/dom/imptests/html/html/semantics/tabular-data/the-table-element/test_createTBody.html
new file mode 100644
index 000000000000..7927e43cae6f
--- /dev/null
+++ b/dom/imptests/html/html/semantics/tabular-data/the-table-element/test_createTBody.html
@@ -0,0 +1,165 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>HTMLTableElement.createTBody</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+function assert_tbody(tbody) {
+  assert_equals(tbody.localName, "tbody");
+  assert_equals(tbody.namespaceURI, htmlNS);
+  assert_equals(tbody.prefix, null);
+}
+var htmlNS = "http://www.w3.org/1999/xhtml";
+test(function() {
+  var table = document.createElement("table");
+  var tbody = table.createTBody();
+  assert_equals(table.firstChild, tbody);
+  assert_tbody(tbody);
+}, "No child nodes");
+
+test(function() {
+  var table = document.createElement("table");
+  var before = table.appendChild(document.createElement("tbody"));
+  assert_array_equals(table.childNodes, [before]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before, tbody]);
+  assert_tbody(tbody);
+}, "One tbody child node");
+
+test(function() {
+  var table = document.createElement("table");
+  var before1 = table.appendChild(document.createElement("tbody"));
+  var before2 = table.appendChild(document.createElement("tbody"));
+  assert_array_equals(table.childNodes, [before1, before2]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before1, before2, tbody]);
+  assert_tbody(tbody);
+}, "Two tbody child nodes");
+
+test(function() {
+  var table = document.createElement("table");
+  var before1 = table.appendChild(document.createElement("thead"));
+  var before2 = table.appendChild(document.createElement("tbody"));
+  assert_array_equals(table.childNodes, [before1, before2]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before1, before2, tbody]);
+  assert_tbody(tbody);
+}, "A thead and a tbody child node");
+
+test(function() {
+  var table = document.createElement("table");
+  var before1 = table.appendChild(document.createElement("tfoot"));
+  var before2 = table.appendChild(document.createElement("tbody"));
+  assert_array_equals(table.childNodes, [before1, before2]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before1, before2, tbody]);
+  assert_tbody(tbody);
+}, "A tfoot and a tbody child node");
+
+test(function() {
+  var table = document.createElement("table");
+  var before = table.appendChild(document.createElement("tbody"));
+  var after = table.appendChild(document.createElement("thead"));
+  assert_array_equals(table.childNodes, [before, after]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before, tbody, after]);
+  assert_tbody(tbody);
+}, "A tbody and a thead child node");
+
+test(function() {
+  var table = document.createElement("table");
+  var before = table.appendChild(document.createElement("tbody"));
+  var after = table.appendChild(document.createElement("tfoot"));
+  assert_array_equals(table.childNodes, [before, after]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before, tbody, after]);
+  assert_tbody(tbody);
+}, "A tbody and a tfoot child node");
+
+test(function() {
+  var table = document.createElement("table");
+  var before1 = table.appendChild(document.createElement("tbody"));
+  var before2 = table.appendChild(document.createElement("tbody"));
+  var after = table.appendChild(document.createElement("div"));
+  assert_array_equals(table.childNodes, [before1, before2, after]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before1, before2, tbody, after]);
+  assert_tbody(tbody);
+}, "Two tbody child nodes and a div");
+
+test(function() {
+  var table = document.createElement("table");
+  var before = table.appendChild(document.createElement("tbody"));
+  var after = table.appendChild(document.createElementNS("x", "tbody"));
+  assert_array_equals(table.childNodes, [before, after]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before, tbody, after]);
+  assert_tbody(tbody);
+}, "One HTML and one namespaced tbody child node");
+
+test(function() {
+  var table = document.createElement("table");
+  var before1 = table.appendChild(document.createElement("tbody"));
+  var before2 = before1.appendChild(document.createElement("tbody"));
+  assert_array_equals(table.childNodes, [before1]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before1, tbody]);
+  assert_tbody(tbody);
+}, "Two nested tbody child nodes");
+
+test(function() {
+  var table = document.createElement("table");
+  var before1 = table.appendChild(document.createElement("thead"));
+  var before2 = before1.appendChild(document.createElement("tbody"));
+  assert_array_equals(table.childNodes, [before1]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before1, tbody]);
+  assert_tbody(tbody);
+}, "A tbody node inside a thead child node");
+
+test(function() {
+  var table = document.createElement("table");
+  var before1 = table.appendChild(document.createElement("tfoot"));
+  var before2 = before1.appendChild(document.createElement("tbody"));
+  assert_array_equals(table.childNodes, [before1]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before1, tbody]);
+  assert_tbody(tbody);
+}, "A tbody node inside a tfoot child node");
+
+test(function() {
+  var table = document.createElement("table");
+  var before = table.appendChild(document.createElement("tbody"));
+  var after1 = table.appendChild(document.createElement("thead"));
+  var after2 = after1.appendChild(document.createElement("tbody"));
+  assert_array_equals(table.childNodes, [before, after1]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before, tbody, after1]);
+  assert_tbody(tbody);
+}, "A tbody node inside a thead child node after a tbody child node");
+
+test(function() {
+  var table = document.createElement("table");
+  var before = table.appendChild(document.createElement("tbody"));
+  var after1 = table.appendChild(document.createElement("tfoot"));
+  var after2 = after1.appendChild(document.createElement("tbody"));
+  assert_array_equals(table.childNodes, [before, after1]);
+
+  var tbody = table.createTBody();
+  assert_array_equals(table.childNodes, [before, tbody, after1]);
+  assert_tbody(tbody);
+}, "A tbody node inside a tfoot child node after a tbody child node");
+</script>