add IDL reflections

Author: keithamus

source

@@ -11946,6 +11946,10 @@ interface <dfn interface>HTMLElement</dfn> : <span>Element</span> {
   undefined <span data-x="dom-hidePopover">hidePopover</span>();
   boolean <span data-x="dom-togglePopover">togglePopover</span>(optional (<span>TogglePopoverOptions</span> or boolean) options = {});
   [<span>CEReactions</span>] attribute DOMString? <span data-x="dom-popover">popover</span>;
+
+  // The headingoffset API
+  [<span>CEReactions</span>] attribute unsigned long <span data-x="dom-headingOffset">headingOffset</span>;
+  [<span>CEReactions</span>] attribute boolean <span data-x="dom-headingReset">headingReset</span>;
 };
 
 dictionary <dfn dictionary>ShowPopoverOptions</dfn> {
@@ -19413,6 +19417,15 @@ interface <dfn interface>HTMLHeadingElement</dfn> : <span>HTMLElement</span> {
   content attribute allows authors to prevent a heading offset computation from traversing beyond
   this point.</p>
 
+  <p>The <dfn attribute for="HTMLElement"><code
+  data-x="dom-headingOffset">headingOffset</code></dfn> IDL attribute must <span>reflect</span> the
+  <code data-x="attr-headingoffset">headingoffset</code> content attribute. It is
+  <span>clamped to the range</span> [0, 9].</p>
+
+  <p>The <dfn attribute for="HTMLElement"><code
+  data-x="dom-headingReset">headingReset</code></dfn> IDL attribute must <span>reflect</span> the
+  <code data-x="attr-headingreset">headingreset</code> content attribute.</p>
+
   <p>To <dfn>get an element's computed heading level</dfn>, given an element <var>element</var>,
   perform the following steps:</p>