update node modules

node_modules/cssstyle/lib/properties/fontSize.js

@@ -2,6 +2,7 @@
 
 var TYPES = require('../parsers').TYPES;
 var valueType = require('../parsers').valueType;
+var parseMeasurement = require('../parsers').parseMeasurement;
 
 var absoluteSizes = ['xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'];
 var relativeSizes = ['larger', 'smaller'];
@@ -16,9 +17,18 @@ module.exports.isValid = function(v) {
   );
 };
 
+function parse(v) {
+  const valueAsString = String(v).toLowerCase();
+  const optionalArguments = absoluteSizes.concat(relativeSizes);
+  const isOptionalArgument = optionalArguments.some(
+    stringValue => stringValue.toLowerCase() === valueAsString
+  );
+  return isOptionalArgument ? valueAsString : parseMeasurement(v);
+}
+
 module.exports.definition = {
   set: function(v) {
-    this._setProperty('font-size', v);
+    this._setProperty('font-size', parse(v));
   },
   get: function() {
     return this.getPropertyValue('font-size');