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diff --git a/tools/eslint/node_modules/parse5/lib/common/doctype.js b/tools/eslint/node_modules/parse5/lib/common/doctype.js
new file mode 100644
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+++ b/tools/eslint/node_modules/parse5/lib/common/doctype.js
@@ -0,0 +1,137 @@
+'use strict';
+
+//Const
+var VALID_DOCTYPE_NAME = 'html',
+    QUIRKS_MODE_SYSTEM_ID = 'http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd',
+    QUIRKS_MODE_PUBLIC_ID_PREFIXES = [
+        '+//silmaril//dtd html pro v0r11 19970101//en',
+        '-//advasoft ltd//dtd html 3.0 aswedit + extensions//en',
+        '-//as//dtd html 3.0 aswedit + extensions//en',
+        '-//ietf//dtd html 2.0 level 1//en',
+        '-//ietf//dtd html 2.0 level 2//en',
+        '-//ietf//dtd html 2.0 strict level 1//en',
+        '-//ietf//dtd html 2.0 strict level 2//en',
+        '-//ietf//dtd html 2.0 strict//en',
+        '-//ietf//dtd html 2.0//en',
+        '-//ietf//dtd html 2.1e//en',
+        '-//ietf//dtd html 3.0//en',
+        '-//ietf//dtd html 3.0//en//',
+        '-//ietf//dtd html 3.2 final//en',
+        '-//ietf//dtd html 3.2//en',
+        '-//ietf//dtd html 3//en',
+        '-//ietf//dtd html level 0//en',
+        '-//ietf//dtd html level 0//en//2.0',
+        '-//ietf//dtd html level 1//en',
+        '-//ietf//dtd html level 1//en//2.0',
+        '-//ietf//dtd html level 2//en',
+        '-//ietf//dtd html level 2//en//2.0',
+        '-//ietf//dtd html level 3//en',
+        '-//ietf//dtd html level 3//en//3.0',
+        '-//ietf//dtd html strict level 0//en',
+        '-//ietf//dtd html strict level 0//en//2.0',
+        '-//ietf//dtd html strict level 1//en',
+        '-//ietf//dtd html strict level 1//en//2.0',
+        '-//ietf//dtd html strict level 2//en',
+        '-//ietf//dtd html strict level 2//en//2.0',
+        '-//ietf//dtd html strict level 3//en',
+        '-//ietf//dtd html strict level 3//en//3.0',
+        '-//ietf//dtd html strict//en',
+        '-//ietf//dtd html strict//en//2.0',
+        '-//ietf//dtd html strict//en//3.0',
+        '-//ietf//dtd html//en',
+        '-//ietf//dtd html//en//2.0',
+        '-//ietf//dtd html//en//3.0',
+        '-//metrius//dtd metrius presentational//en',
+        '-//microsoft//dtd internet explorer 2.0 html strict//en',
+        '-//microsoft//dtd internet explorer 2.0 html//en',
+        '-//microsoft//dtd internet explorer 2.0 tables//en',
+        '-//microsoft//dtd internet explorer 3.0 html strict//en',
+        '-//microsoft//dtd internet explorer 3.0 html//en',
+        '-//microsoft//dtd internet explorer 3.0 tables//en',
+        '-//netscape comm. corp.//dtd html//en',
+        '-//netscape comm. corp.//dtd strict html//en',
+        '-//o\'reilly and associates//dtd html 2.0//en',
+        '-//o\'reilly and associates//dtd html extended 1.0//en',
+        '-//spyglass//dtd html 2.0 extended//en',
+        '-//sq//dtd html 2.0 hotmetal + extensions//en',
+        '-//sun microsystems corp.//dtd hotjava html//en',
+        '-//sun microsystems corp.//dtd hotjava strict html//en',
+        '-//w3c//dtd html 3 1995-03-24//en',
+        '-//w3c//dtd html 3.2 draft//en',
+        '-//w3c//dtd html 3.2 final//en',
+        '-//w3c//dtd html 3.2//en',
+        '-//w3c//dtd html 3.2s draft//en',
+        '-//w3c//dtd html 4.0 frameset//en',
+        '-//w3c//dtd html 4.0 transitional//en',
+        '-//w3c//dtd html experimental 19960712//en',
+        '-//w3c//dtd html experimental 970421//en',
+        '-//w3c//dtd w3 html//en',
+        '-//w3o//dtd w3 html 3.0//en',
+        '-//w3o//dtd w3 html 3.0//en//',
+        '-//webtechs//dtd mozilla html 2.0//en',
+        '-//webtechs//dtd mozilla html//en'
+    ],
+    QUIRKS_MODE_NO_SYSTEM_ID_PUBLIC_ID_PREFIXES = [
+        '-//w3c//dtd html 4.01 frameset//',
+        '-//w3c//dtd html 4.01 transitional//'
+    ],
+    QUIRKS_MODE_PUBLIC_IDS = [
+        '-//w3o//dtd w3 html strict 3.0//en//',
+        '-/w3c/dtd html 4.0 transitional/en',
+        'html'
+    ];
+
+
+//Utils
+function enquoteDoctypeId(id) {
+    var quote = id.indexOf('"') !== -1 ? '\'' : '"';
+
+    return quote + id + quote;
+}
+
+
+//API
+exports.isQuirks = function (name, publicId, systemId) {
+    if (name !== VALID_DOCTYPE_NAME)
+        return true;
+
+    if (systemId && systemId.toLowerCase() === QUIRKS_MODE_SYSTEM_ID)
+        return true;
+
+    if (publicId !== null) {
+        publicId = publicId.toLowerCase();
+
+        if (QUIRKS_MODE_PUBLIC_IDS.indexOf(publicId) > -1)
+            return true;
+
+        var prefixes = QUIRKS_MODE_PUBLIC_ID_PREFIXES;
+
+        if (systemId === null)
+            prefixes = prefixes.concat(QUIRKS_MODE_NO_SYSTEM_ID_PUBLIC_ID_PREFIXES);
+
+        for (var i = 0; i < prefixes.length; i++) {
+            if (publicId.indexOf(prefixes[i]) === 0)
+                return true;
+        }
+    }
+
+    return false;
+};
+
+exports.serializeContent = function (name, publicId, systemId) {
+    var str = '!DOCTYPE ';
+
+    if (name)
+        str += name;
+
+    if (publicId !== null)
+        str += ' PUBLIC ' + enquoteDoctypeId(publicId);
+
+    else if (systemId !== null)
+        str += ' SYSTEM';
+
+    if (systemId !== null)
+        str += ' ' + enquoteDoctypeId(systemId);
+
+    return str;
+};