Push-pop custom elements reaction stack when the parser inserts elements

third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 85 matching lines @@
 }
 
 static inline bool isAllWhitespace(const String& string) {
   return string.isAllSpecialCharacters<isHTMLSpace<UChar>>();
 }
 
 static inline void insert(HTMLConstructionSiteTask& task) {
   if (isHTMLTemplateElement(*task.parent))
     task.parent = toHTMLTemplateElement(task.parent.get())->content();
 
+  // https://html.spec.whatwg.org/#insert-a-foreign-element
+  // 3.1, (3) Push (pop) an element queue
+  CEReactionsScope reactions;
   if (task.nextChild)
     task.parent->parserInsertBefore(task.child.get(), *task.nextChild);
   else
     task.parent->parserAppendChild(task.child.get());
 }
 
 static inline void executeInsertTask(HTMLConstructionSiteTask& task) {
   ASSERT(task.operation == HTMLConstructionSiteTask::Insert);
 
   insert(task);
@@ skipping 955 matching lines @@
   ASSERT(task.parent);
   queueTask(task);
 }
 
 DEFINE_TRACE(HTMLConstructionSite::PendingText) {
   visitor->trace(parent);
   visitor->trace(nextChild);
 }
 
 }  // namespace blink