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diff --git a/parser/htmlparser/nsIHTMLContentSink.h b/parser/htmlparser/nsIHTMLContentSink.h
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+++ b/parser/htmlparser/nsIHTMLContentSink.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 nsIHTMLContentSink_h___
+#define nsIHTMLContentSink_h___
+
+/**
+ * This interface is OBSOLETE and in the process of being REMOVED.
+ * Do NOT implement!
+ *
+ * This file declares the concrete HTMLContentSink class.
+ * This class is used during the parsing process as the
+ * primary interface between the parser and the content
+ * model.
+ *
+ * After the tokenizer completes, the parser iterates over
+ * the known token list. As the parser identifies valid
+ * elements, it calls the contentsink interface to notify
+ * the content model that a new node or child node is being
+ * created and added to the content model.
+ *
+ * The HTMLContentSink interface assumes 4 underlying
+ * containers: HTML, HEAD, BODY and FRAMESET. Before
+ * accessing any these, the parser will call the appropriate
+ * OpennsIHTMLContentSink method: OpenHTML,OpenHead,OpenBody,OpenFrameSet;
+ * likewise, the ClosensIHTMLContentSink version will be called when the
+ * parser is done with a given section.
+ *
+ * IMPORTANT: The parser may Open each container more than
+ * once! This is due to the irregular nature of HTML files.
+ * For example, it is possible to encounter plain text at
+ * the start of an HTML document (that precedes the HTML tag).
+ * Such text is treated as if it were part of the body.
+ * In such cases, the parser will Open the body, pass the text-
+ * node in and then Close the body. The body will likely be
+ * re-Opened later when the actual <BODY> tag has been seen.
+ *
+ * Containers within the body are Opened and Closed
+ * using the OpenContainer(...) and CloseContainer(...) calls.
+ * It is assumed that the document or contentSink is
+ * maintaining its state to manage where new content should
+ * be added to the underlying document.
+ *
+ * NOTE: OpenHTML() and OpenBody() may get called multiple times
+ *       in the same document. That's fine, and it doesn't mean
+ *       that we have multiple bodies or HTML's.
+ *
+ * NOTE: I haven't figured out how sub-documents (non-frames)
+ *       are going to be handled. Stay tuned.
+ */
+#include "nsIContentSink.h"
+#include "nsHTMLTags.h"
+
+#define NS_IHTML_CONTENT_SINK_IID                    \
+  {                                                  \
+    0xefc5af86, 0x5cfd, 0x4918, {                    \
+      0x9d, 0xd3, 0x5f, 0x7a, 0xb2, 0x88, 0xb2, 0x68 \
+    }                                                \
+  }
+
+/**
+ * This interface is OBSOLETE and in the process of being REMOVED.
+ * Do NOT implement!
+ */
+class nsIHTMLContentSink : public nsIContentSink {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IHTML_CONTENT_SINK_IID)
+
+  enum ElementType { eHTML, eBody };
+
+  /**
+   * This method is used to open a generic container in the sink.
+   *
+   * @update 4/1/98 gess
+   */
+  NS_IMETHOD OpenContainer(ElementType aNodeType) = 0;
+
+  /**
+   *  This method gets called by the parser when a close
+   *  container tag has been consumed and needs to be closed.
+   *
+   * @param  aTag - The tag to be closed.
+   */
+  NS_IMETHOD CloseContainer(ElementType aTag) = 0;
+
+  /**
+   *  This method returns true if there are more than one
+   *  pending style sheets, false otherwise.
+   */
+  virtual bool WaitForPendingSheets() = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIHTMLContentSink, NS_IHTML_CONTENT_SINK_IID)
+
+#endif /* nsIHTMLContentSink_h___ */