1 files changed, 29 insertions, 0 deletions
diff --git a/parser/html/nsHtml5AutoPauseUpdate.h b/parser/html/nsHtml5AutoPauseUpdate.h
new file mode 100644
index 0000000000..16c298111d
--- /dev/null
+++ b/parser/html/nsHtml5AutoPauseUpdate.h
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sw=2 et tw=78: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsHtml5AutoPauseUpdate_h
+#define nsHtml5AutoPauseUpdate_h
+
+#include "nsHtml5DocumentBuilder.h"
+
+class MOZ_RAII nsHtml5AutoPauseUpdate final {
+ private:
+  RefPtr<nsHtml5DocumentBuilder> mBuilder;
+
+ public:
+  explicit nsHtml5AutoPauseUpdate(nsHtml5DocumentBuilder* aBuilder)
+      : mBuilder(aBuilder) {
+    mBuilder->EndDocUpdate();
+  }
+  ~nsHtml5AutoPauseUpdate() {
+    // Something may have terminated the parser during the update pause.
+    if (!mBuilder->IsComplete()) {
+      mBuilder->BeginDocUpdate();
+    }
+  }
+};
+
+#endif  // nsHtml5AutoPauseUpdate_h