diff --git a/vendor-overwrites/csslint/parserlib.js b/vendor-overwrites/csslint/parserlib.js
index 7d2586c4..3a4f5d45 100644
--- a/vendor-overwrites/csslint/parserlib.js
+++ b/vendor-overwrites/csslint/parserlib.js
@@ -1426,12 +1426,13 @@ self.parserlib = (() => {
     GREATER: {text: '>'},
     COMMA: {text: ','},
     TILDE: {text: '~'},
+    COLUMN: {text: '||'},
 
     // modifier
     NOT: {},
     ANY: {text: ['any', '-webkit-any', '-moz-any']},
-    MATCHES: {},
     IS: {},
+    WHERE: {},
 
     /*
      * Defined in CSS3 Paged Media
@@ -1468,7 +1469,6 @@ self.parserlib = (() => {
     // part of CSS3 grammar but not the Flex code
     CHAR: {},
 
-    // TODO: Needed?
     // Not defined as tokens, but might as well be
     PIPE: {text: '|'},
     SLASH: {text: '/'},
@@ -2205,6 +2205,7 @@ self.parserlib = (() => {
         value === '>' ? 'child' :
         value === '+' ? 'adjacent-sibling' :
         value === '~' ? 'sibling' :
+        value === '||' ? 'column' :
         !value.trim() ? 'descendant' :
           'unknown';
     }
@@ -2943,6 +2944,7 @@ self.parserlib = (() => {
          * - PREFIXMATCH
          * - SUFFIXMATCH
          * - SUBSTRINGMATCH
+         * - COLUMN
          * - CHAR
          */
         case '|':
@@ -2950,10 +2952,11 @@ self.parserlib = (() => {
         case '^':
         case '$':
         case '*':
-          return reader.peek() === '=' ?
-            this.comparisonToken(c, pos) :
-            this.charToken(c, pos);
-
+          return (
+            reader.peek() === '=' ? this.comparisonToken(c, pos) :
+            reader.readMatch('|') ? this.createToken(Tokens.COLUMN, '||', pos) :
+              this.charToken(c, pos)
+          );
         /*
          * Potential tokens:
          * - STRING
@@ -3043,8 +3046,8 @@ self.parserlib = (() => {
          * Potential tokens:
          * - ANY
          * - IS
-         * - MATCHES
          * - NOT
+         * - WHERE
          * - CHAR
          */
         case ':':
@@ -3258,18 +3261,18 @@ self.parserlib = (() => {
     // NOT
     // IS
     // ANY
-    // MATCHES
     // CHAR
     notOrIsToken(first, pos) {
       // first is always ':'
       const reader = this._reader;
-      const func = reader.readMatch(/(not|is|(-(moz|webkit)-)?(any|matches))\(/iy);
+      const func = reader.readMatch(/(not|is|where|(-(moz|webkit)-)?any)\(/iy);
       if (func) {
         const lcase = func[0].toLowerCase();
         const type =
           lcase === 'n' ? Tokens.NOT :
           lcase === 'i' ? Tokens.IS :
-          lcase === 'm' ? Tokens.MATCHES : Tokens.ANY;
+          lcase === 'w' ? Tokens.WHERE :
+            Tokens.ANY;
         return this.createToken(type, first + func, pos);
       }
       return this.charToken(first, pos);
@@ -4369,7 +4372,7 @@ self.parserlib = (() => {
     }
 
     _combinator() {
-      if (this._tokenStream.match([Tokens.PLUS, Tokens.GREATER, Tokens.TILDE])) {
+      if (this._tokenStream.match([Tokens.PLUS, Tokens.GREATER, Tokens.TILDE, Tokens.COLUMN])) {
         const value = new Combinator(this._tokenStream._token);
         this._ws();
         return value;
@@ -4633,7 +4636,8 @@ self.parserlib = (() => {
                  this._ws();
 
         if (stream.match([Tokens.IDENT])) {
-          if (lower(stream._token.value) === 'i') {
+          const caseMod = lower(stream._token.value);
+          if (caseMod === 'i' || caseMod === 's') {
             value += stream._token.value +
                      this._ws();
           } else {
@@ -4713,7 +4717,7 @@ self.parserlib = (() => {
 
     _is() {
       const stream = this._tokenStream;
-      if (!stream.match([Tokens.IS, Tokens.ANY, Tokens.MATCHES])) return null;
+      if (!stream.match([Tokens.IS, Tokens.ANY, Tokens.WHERE])) return null;
 
       let arg;
       const start = stream._token;
@@ -5448,7 +5452,7 @@ self.parserlib = (() => {
       [Tokens.COLON, Parser.prototype._pseudo],
       [Tokens.IS, Parser.prototype._is],
       [Tokens.ANY, Parser.prototype._is],
-      [Tokens.MATCHES, Parser.prototype._is],
+      [Tokens.WHERE, Parser.prototype._is],
       [Tokens.NOT, Parser.prototype._negation],
     ]),
   };