Sync HTML element interfaces S-V with the spec

Source/core/html/HTMLTableSectionElement.idl

Index: Source/core/html/HTMLTableSectionElement.idl
diff --git a/Source/core/html/HTMLTableSectionElement.idl b/Source/core/html/HTMLTableSectionElement.idl
index 881667693cb99b4031412d8541d5a276170ee704..7dd966d0e10f86ff3c86d19277d64b1edce11061 100644
--- a/Source/core/html/HTMLTableSectionElement.idl
+++ b/Source/core/html/HTMLTableSectionElement.idl
@@ -18,12 +18,20 @@
  * Boston, MA 02110-1301, USA.
  */
 
+// https://html.spec.whatwg.org/#the-tbody-element
+// https://html.spec.whatwg.org/#the-thead-element
+// https://html.spec.whatwg.org/#the-tfoot-element
+
 interface HTMLTableSectionElement : HTMLElement {
+    readonly attribute HTMLCollection rows;
+    [RaisesException] HTMLElement insertRow(optional long index = -1);
+    // TODO(philipj): The index argument should not be optional.
+    [RaisesException] void deleteRow([Default=Undefined] optional long index);
+
+    // obsolete members
+    // https://html.spec.whatwg.org/#HTMLTableSectionElement-partial
     [Reflect] attribute DOMString align;
     [Reflect=char] attribute DOMString ch;
     [Reflect=charoff] attribute DOMString chOff;
     [Reflect] attribute DOMString vAlign;
-    readonly attribute HTMLCollection rows;
-    [RaisesException] HTMLElement insertRow(optional long index = -1);
-    [RaisesException] void deleteRow([Default=Undefined] optional long index);
 };