--- original
+++ modified
@@ -7,6 +7,7 @@
 use html5ever::{LocalName, Prefix, local_name, ns};
 use js::context::JSContext;
 use js::rust::HandleObject;
+use servo_constellation_traits::{EmbeddedWebViewEventType, ScriptToConstellationMessage};
 use style::attr::AttrValue;
 use style::color::AbsoluteColor;

@@ -136,6 +137,12 @@
                 window.webview_id(),
                 LoadStatus::HeadParsed,
             ));
+            // Also notify parent iframe if this is an embedded webview.
+            window.send_to_constellation(
+                ScriptToConstellationMessage::EmbeddedWebViewNotification(
+                    EmbeddedWebViewEventType::LoadStatusChanged(LoadStatus::HeadParsed),
+                ),
+            );
         }
     }