Fix document.write check for activity.

components/script/dom/document.rs

@@ -3271,8 +3271,7 @@ impl DocumentMethods for Document {
 
         // Step 2.
         // TODO: handle throw-on-dynamic-markup-insertion counter.
-        // FIXME: this should check for being active rather than fully active
-        if !self.is_fully_active() {
+        if !self.is_active() {
             // Step 3.
             return Ok(());
         }

components/script/script_thread.rs

@@ -1304,6 +1304,7 @@ impl ScriptThread {
 
     /// Handles activity change message
     fn handle_set_document_activity_msg(&self, id: PipelineId, activity: DocumentActivity) {
+        debug!("Setting activity of {} to be {:?}.", id, activity);
         let document = self.documents.borrow().find_document(id);
         if let Some(document) = document {
             document.set_activity(activity);