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diff --git a/3rdparty/gumbo-parser/src/error.h b/3rdparty/gumbo-parser/src/error.h
new file mode 100644
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+++ b/3rdparty/gumbo-parser/src/error.h
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+// Copyright 2010 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)
+//
+// Error types, enums, and handling functions.
+
+#ifndef GUMBO_ERROR_H_
+#define GUMBO_ERROR_H_
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+#include <stdint.h>
+
+#include "gumbo.h"
+#include "insertion_mode.h"
+#include "string_buffer.h"
+#include "token_type.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct GumboInternalParser;
+
+typedef enum {
+  GUMBO_ERR_UTF8_INVALID,
+  GUMBO_ERR_UTF8_TRUNCATED,
+  GUMBO_ERR_UTF8_NULL,
+  GUMBO_ERR_NUMERIC_CHAR_REF_NO_DIGITS,
+  GUMBO_ERR_NUMERIC_CHAR_REF_WITHOUT_SEMICOLON,
+  GUMBO_ERR_NUMERIC_CHAR_REF_INVALID,
+  GUMBO_ERR_NAMED_CHAR_REF_WITHOUT_SEMICOLON,
+  GUMBO_ERR_NAMED_CHAR_REF_INVALID,
+  GUMBO_ERR_TAG_STARTS_WITH_QUESTION,
+  GUMBO_ERR_TAG_EOF,
+  GUMBO_ERR_TAG_INVALID,
+  GUMBO_ERR_CLOSE_TAG_EMPTY,
+  GUMBO_ERR_CLOSE_TAG_EOF,
+  GUMBO_ERR_CLOSE_TAG_INVALID,
+  GUMBO_ERR_SCRIPT_EOF,
+  GUMBO_ERR_ATTR_NAME_EOF,
+  GUMBO_ERR_ATTR_NAME_INVALID,
+  GUMBO_ERR_ATTR_DOUBLE_QUOTE_EOF,
+  GUMBO_ERR_ATTR_SINGLE_QUOTE_EOF,
+  GUMBO_ERR_ATTR_UNQUOTED_EOF,
+  GUMBO_ERR_ATTR_UNQUOTED_RIGHT_BRACKET,
+  GUMBO_ERR_ATTR_UNQUOTED_EQUALS,
+  GUMBO_ERR_ATTR_AFTER_EOF,
+  GUMBO_ERR_ATTR_AFTER_INVALID,
+  GUMBO_ERR_DUPLICATE_ATTR,
+  GUMBO_ERR_SOLIDUS_EOF,
+  GUMBO_ERR_SOLIDUS_INVALID,
+  GUMBO_ERR_DASHES_OR_DOCTYPE,
+  GUMBO_ERR_COMMENT_EOF,
+  GUMBO_ERR_COMMENT_INVALID,
+  GUMBO_ERR_COMMENT_BANG_AFTER_DOUBLE_DASH,
+  GUMBO_ERR_COMMENT_DASH_AFTER_DOUBLE_DASH,
+  GUMBO_ERR_COMMENT_SPACE_AFTER_DOUBLE_DASH,
+  GUMBO_ERR_COMMENT_END_BANG_EOF,
+  GUMBO_ERR_DOCTYPE_EOF,
+  GUMBO_ERR_DOCTYPE_INVALID,
+  GUMBO_ERR_DOCTYPE_SPACE,
+  GUMBO_ERR_DOCTYPE_RIGHT_BRACKET,
+  GUMBO_ERR_DOCTYPE_SPACE_OR_RIGHT_BRACKET,
+  GUMBO_ERR_DOCTYPE_END,
+  GUMBO_ERR_PARSER,
+  GUMBO_ERR_UNACKNOWLEDGED_SELF_CLOSING_TAG,
+} GumboErrorType;
+
+// Additional data for duplicated attributes.
+typedef struct GumboInternalDuplicateAttrError {
+  // The name of the attribute.  Owned by this struct.
+  const char* name;
+
+  // The (0-based) index within the attributes vector of the original
+  // occurrence.
+  unsigned int original_index;
+
+  // The (0-based) index where the new occurrence would be.
+  unsigned int new_index;
+} GumboDuplicateAttrError;
+
+// A simplified representation of the tokenizer state, designed to be more
+// useful to clients of this library than the internal representation.  This
+// condenses the actual states used in the tokenizer state machine into a few
+// values that will be familiar to users of HTML.
+typedef enum {
+  GUMBO_ERR_TOKENIZER_DATA,
+  GUMBO_ERR_TOKENIZER_CHAR_REF,
+  GUMBO_ERR_TOKENIZER_RCDATA,
+  GUMBO_ERR_TOKENIZER_RAWTEXT,
+  GUMBO_ERR_TOKENIZER_PLAINTEXT,
+  GUMBO_ERR_TOKENIZER_SCRIPT,
+  GUMBO_ERR_TOKENIZER_TAG,
+  GUMBO_ERR_TOKENIZER_SELF_CLOSING_TAG,
+  GUMBO_ERR_TOKENIZER_ATTR_NAME,
+  GUMBO_ERR_TOKENIZER_ATTR_VALUE,
+  GUMBO_ERR_TOKENIZER_MARKUP_DECLARATION,
+  GUMBO_ERR_TOKENIZER_COMMENT,
+  GUMBO_ERR_TOKENIZER_DOCTYPE,
+  GUMBO_ERR_TOKENIZER_CDATA,
+} GumboTokenizerErrorState;
+
+// Additional data for tokenizer errors.
+// This records the current state and codepoint encountered - this is usually
+// enough to reconstruct what went wrong and provide a friendly error message.
+typedef struct GumboInternalTokenizerError {
+  // The bad codepoint encountered.
+  int codepoint;
+
+  // The state that the tokenizer was in at the time.
+  GumboTokenizerErrorState state;
+} GumboTokenizerError;
+
+// Additional data for parse errors.
+typedef struct GumboInternalParserError {
+  // The type of input token that resulted in this error.
+  GumboTokenType input_type;
+
+  // The HTML tag of the input token.  TAG_UNKNOWN if this was not a tag token.
+  GumboTag input_tag;
+
+  // The insertion mode that the parser was in at the time.
+  GumboInsertionMode parser_state;
+
+  // The tag stack at the point of the error.  Note that this is an GumboVector
+  // of GumboTag's *stored by value* - cast the void* to an GumboTag directly to
+  // get at the tag.
+  GumboVector /* GumboTag */ tag_stack;
+} GumboParserError;
+
+// The overall error struct representing an error in decoding/tokenizing/parsing
+// the HTML.  This contains an enumerated type flag, a source position, and then
+// a union of fields containing data specific to the error.
+typedef struct GumboInternalError {
+  // The type of error.
+  GumboErrorType type;
+
+  // The position within the source file where the error occurred.
+  GumboSourcePosition position;
+
+  // A pointer to the byte within the original source file text where the error
+  // occurred (note that this is not the same as position.offset, as that gives
+  // character-based instead of byte-based offsets).
+  const char* original_text;
+
+  // Type-specific error information.
+  union {
+    // The code point we encountered, for:
+    // * GUMBO_ERR_UTF8_INVALID
+    // * GUMBO_ERR_UTF8_TRUNCATED
+    // * GUMBO_ERR_NUMERIC_CHAR_REF_WITHOUT_SEMICOLON
+    // * GUMBO_ERR_NUMERIC_CHAR_REF_INVALID
+    uint64_t codepoint;
+
+    // Tokenizer errors.
+    GumboTokenizerError tokenizer;
+
+    // Short textual data, for:
+    // * GUMBO_ERR_NAMED_CHAR_REF_WITHOUT_SEMICOLON
+    // * GUMBO_ERR_NAMED_CHAR_REF_INVALID
+    GumboStringPiece text;
+
+    // Duplicate attribute data, for GUMBO_ERR_DUPLICATE_ATTR.
+    GumboDuplicateAttrError duplicate_attr;
+
+    // Parser state, for GUMBO_ERR_PARSER and
+    // GUMBO_ERR_UNACKNOWLEDGE_SELF_CLOSING_TAG.
+    struct GumboInternalParserError parser;
+  } v;
+} GumboError;
+
+// Adds a new error to the parser's error list, and returns a pointer to it so
+// that clients can fill out the rest of its fields.  May return NULL if we're
+// already over the max_errors field specified in GumboOptions.
+GumboError* gumbo_add_error(struct GumboInternalParser* parser);
+
+// Initializes the errors vector in the parser.
+void gumbo_init_errors(struct GumboInternalParser* errors);
+
+// Frees all the errors in the 'errors_' field of the parser.
+void gumbo_destroy_errors(struct GumboInternalParser* errors);
+
+// Frees the memory used for a single GumboError.
+void gumbo_error_destroy(struct GumboInternalParser* parser, GumboError* error);
+
+// Prints an error to a string.  This fills an empty GumboStringBuffer with a
+// freshly-allocated buffer containing the error message text.  The caller is
+// responsible for deleting the buffer.  (Note that the buffer is allocated with
+// the allocator specified in the GumboParser config and hence should be freed
+// by gumbo_parser_deallocate().)
+void gumbo_error_to_string(struct GumboInternalParser* parser,
+    const GumboError* error, GumboStringBuffer* output);
+
+// Prints a caret diagnostic to a string.  This fills an empty GumboStringBuffer
+// with a freshly-allocated buffer containing the error message text.  The
+// caller is responsible for deleting the buffer.  (Note that the buffer is
+// allocated with the allocator specified in the GumboParser config and hence
+// should be freed by gumbo_parser_deallocate().)
+void gumbo_caret_diagnostic_to_string(struct GumboInternalParser* parser,
+    const GumboError* error, const char* source_text,
+    GumboStringBuffer* output);
+
+// Like gumbo_caret_diagnostic_to_string, but prints the text to stdout instead
+// of writing to a string.
+void gumbo_print_caret_diagnostic(struct GumboInternalParser* parser,
+    const GumboError* error, const char* source_text);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // GUMBO_ERROR_H_