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diff --git a/3rdparty/gumbo-parser/src/char_ref.h b/3rdparty/gumbo-parser/src/char_ref.h
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+++ b/3rdparty/gumbo-parser/src/char_ref.h
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+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Author: jdtang@google.com (Jonathan Tang)
+//
+// Internal header for character reference handling; this should not be exposed
+// transitively by any public API header.  This is why the functions aren't
+// namespaced.
+
+#ifndef GUMBO_CHAR_REF_H_
+#define GUMBO_CHAR_REF_H_
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct GumboInternalParser;
+struct GumboInternalUtf8Iterator;
+
+// Value that indicates no character was produced.
+extern const int kGumboNoChar;
+
+// Certain named character references generate two codepoints, not one, and so
+// the consume_char_ref subroutine needs to return this instead of an int.  The
+// first field will be kGumboNoChar if no character reference was found; the
+// second field will be kGumboNoChar if that is the case or if the character
+// reference returns only a single codepoint.
+typedef struct {
+  int first;
+  int second;
+} OneOrTwoCodepoints;
+
+// Implements the "consume a character reference" section of the spec.
+// This reads in characters from the input as necessary, and fills in a
+// OneOrTwoCodepoints struct containing the characters read.  It may add parse
+// errors to the GumboParser's errors vector, if the spec calls for it.  Pass a
+// space for the "additional allowed char" when the spec says "with no
+// additional allowed char".  Returns false on parse error, true otherwise.
+bool consume_char_ref(struct GumboInternalParser* parser,
+    struct GumboInternalUtf8Iterator* input, int additional_allowed_char,
+    bool is_in_attribute, OneOrTwoCodepoints* output);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // GUMBO_CHAR_REF_H_