diff --git a/source b/source
index 24deb7efbb8..42c20929f21 100644
--- a/source
+++ b/source
@@ -156978,6 +156978,8 @@ interface <dfn interface>HTMLDirectoryElement</dfn> : <span>HTMLElement</span> {
   <pre><code class="idl">partial interface <span id="HTMLEmbedElement-partial">HTMLEmbedElement</span> {
   [<span>CEReactions</span>, <span data-x="xattr-Reflect">Reflect</span>] attribute DOMString <dfn attribute for="HTMLEmbedElement" data-x="dom-embed-align">align</dfn>;
   [<span>CEReactions</span>, <span data-x="xattr-Reflect">Reflect</span>] attribute DOMString <dfn attribute for="HTMLEmbedElement" data-x="dom-embed-name">name</dfn>;
+  [<span>CEReactions</span>, <span data-x="xattr-Reflect">Reflect</span>] attribute unsigned long <dfn attribute for="HTMLEmbedElement" data-x="dom-embed-hspace">hspace</dfn>;
+  [<span>CEReactions</span>, <span data-x="xattr-Reflect">Reflect</span>] attribute unsigned long <dfn attribute for="HTMLEmbedElement" data-x="dom-embed-vspace">vspace</dfn>;
 };</code></pre>
 
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