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diff --git a/parser/html/nsAHtml5TreeOpSink.h b/parser/html/nsAHtml5TreeOpSink.h
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+++ b/parser/html/nsAHtml5TreeOpSink.h
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+/* 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 nsAHtml5TreeOpSink_h
+#define nsAHtml5TreeOpSink_h
+
+#include "nsTArrayForwardDeclare.h"
+
+class nsHtml5TreeOperation;
+
+/**
+ * The purpose of this interface is to connect a tree op executor
+ * (main-thread case), a tree op stage (non-speculative off-the-main-thread
+ * case) or a speculation (speculative case).
+ */
+class nsAHtml5TreeOpSink {
+ public:
+  /**
+   * Flush the operations from the tree operations from the argument
+   * queue into this sink unconditionally.
+   *
+   * Returns `true` on success and `false` on OOM.
+   */
+  [[nodiscard]] virtual bool MoveOpsFrom(
+      nsTArray<nsHtml5TreeOperation>& aOpQueue) = 0;
+};
+
+#endif /* nsAHtml5TreeOpSink_h */