diff --git a/lib/properties/borderStyle.js b/lib/properties/borderStyle.js
index 135e46bf..f0f93c7c 100644
--- a/lib/properties/borderStyle.js
+++ b/lib/properties/borderStyle.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var implicitSetter = require('../parsers').implicitSetter;
+const { implicitSetter, parseKeyword } = require('../parsers');
 
 // the valid border-styles:
 var styles = [
@@ -16,20 +16,17 @@ var styles = [
   'outset',
 ];
 
-module.exports.isValid = function parse(v) {
-  return v === '' || styles.indexOf(v) !== -1;
-};
-var isValid = module.exports.isValid;
+function parse(v) {
+  return parseKeyword(v, styles);
+}
 
-var parser = function(v) {
-  if (isValid(v)) {
-    return v.toLowerCase();
-  }
-  return undefined;
-};
+function isValid(v) {
+  return parse(v) !== undefined;
+}
+module.exports.isValid = isValid;
 
 module.exports.definition = {
-  set: implicitSetter('border', 'style', isValid, parser),
+  set: implicitSetter('border', 'style', isValid, parse),
   get: function() {
     return this.getPropertyValue('border-style');
   },
diff --git a/lib/properties/borderWidth.js b/lib/properties/borderWidth.js
index 88b2aa82..acccbbb0 100644
--- a/lib/properties/borderWidth.js
+++ b/lib/properties/borderWidth.js
@@ -1,40 +1,18 @@
 'use strict';
 
-var parsers = require('../parsers');
-var implicitSetter = require('../parsers').implicitSetter;
+const { implicitSetter, parseKeyword, parseLength } = require('../parsers');
 
-// the valid border-widths:
-var widths = ['thin', 'medium', 'thick'];
+function parse(v) {
+  return parseLength(v) || parseKeyword(v, ['medium', 'thick', 'thin']);
+}
 
-module.exports.isValid = function parse(v) {
-  var length = parsers.parseLength(v);
-  if (length !== undefined) {
-    return true;
-  }
-  if (v === '') {
-    return true;
-  }
-  v = v.toLowerCase();
-  if (widths.indexOf(v) === -1) {
-    return false;
-  }
-  return true;
-};
-var isValid = module.exports.isValid;
-
-var parser = function(v) {
-  var length = parsers.parseLength(v);
-  if (length !== undefined) {
-    return length;
-  }
-  if (isValid(v)) {
-    return v.toLowerCase();
-  }
-  return undefined;
-};
+function isValid(v) {
+  return parse(v) !== undefined;
+}
+module.exports.isValid = isValid;
 
 module.exports.definition = {
-  set: implicitSetter('border', 'width', isValid, parser),
+  set: implicitSetter('border', 'width', isValid, parse),
   get: function() {
     return this.getPropertyValue('border-width');
   },
diff --git a/lib/properties/clip.js b/lib/properties/clip.js
index e25481f8..87dfffd9 100644
--- a/lib/properties/clip.js
+++ b/lib/properties/clip.js
@@ -1,15 +1,12 @@
 'use strict';
 
-const { parseLengthOrPercentage } = require('../parsers');
+const { parseKeyword, parseLengthOrPercentage } = require('../parsers');
 
 var shape_regex = /^rect\((.*)\)$/i;
 
-var parse = function(val) {
-  if (val === '') {
-    return val;
-  }
-  val = val.toLowerCase();
-  if (val === 'auto' || val === 'inherit') {
+function parse(val) {
+  const keyword = parseKeyword(val, ['auto']);
+  if (keyword !== undefined) {
     return val;
   }
   var matches = val.match(shape_regex);
@@ -30,7 +27,7 @@ var parse = function(val) {
   }
   parts = parts.join(', ');
   return val.replace(matches[1], parts);
-};
+}
 
 module.exports.definition = {
   set: function(v) {
diff --git a/lib/properties/fontWeight.js b/lib/properties/fontWeight.js
index b854f6ab..9a40c192 100644
--- a/lib/properties/fontWeight.js
+++ b/lib/properties/fontWeight.js
@@ -1,24 +1,20 @@
 'use strict';
 
-var valid_weights = [
-  'normal',
-  'bold',
-  'bolder',
-  'lighter',
-  '100',
-  '200',
-  '300',
-  '400',
-  '500',
-  '600',
-  '700',
-  '800',
-  '900',
-  'inherit',
-];
+const { parseInteger, parseKeyword } = require('../parsers');
+
+function parse(v) {
+  const integer = parseInteger(v);
+  if (integer) {
+    if (integer < 1 || 1000 < integer) {
+      return undefined;
+    }
+    return integer;
+  }
+  return parseKeyword(v, ['bold', 'bolder', 'lighter', 'normal']);
+}
 
 module.exports.isValid = function isValid(v) {
-  return valid_weights.indexOf(v.toLowerCase()) !== -1;
+  return parse(v) !== undefined;
 };
 
 module.exports.definition = {
diff --git a/lib/properties/height.js b/lib/properties/height.js
index 48816196..cec9faaf 100644
--- a/lib/properties/height.js
+++ b/lib/properties/height.js
@@ -1,15 +1,9 @@
 'use strict';
 
-const { parseLengthOrPercentage } = require('../parsers');
+const { parseKeyword, parseLengthOrPercentage } = require('../parsers');
 
 function parse(v) {
-  if (v.toLowerCase() === 'auto') {
-    return 'auto';
-  }
-  if (v.toLowerCase() === 'inherit') {
-    return 'inherit';
-  }
-  return parseLengthOrPercentage(v);
+  return parseKeyword(v, ['auto']) || parseLengthOrPercentage(v);
 }
 
 module.exports.definition = {
diff --git a/lib/properties/lineHeight.js b/lib/properties/lineHeight.js
index bc2d47d1..bb701366 100644
--- a/lib/properties/lineHeight.js
+++ b/lib/properties/lineHeight.js
@@ -2,12 +2,12 @@
 
 const { parseKeyword, parseNumber, parseLengthOrPercentage } = require('../parsers');
 
+function parse(v) {
+  return parseKeyword(v, ['normal']) || parseNumber(v) || parseLengthOrPercentage(v);
+}
+
 module.exports.isValid = function isValid(v) {
-  return (
-    parseKeyword(v, ['normal']) !== undefined ||
-    parseNumber(v) !== undefined ||
-    parseLengthOrPercentage(v) !== undefined
-  );
+  return parse(v) !== undefined;
 };
 
 module.exports.definition = {
diff --git a/lib/properties/margin.js b/lib/properties/margin.js
index b62e1788..53d04ad1 100644
--- a/lib/properties/margin.js
+++ b/lib/properties/margin.js
@@ -1,23 +1,16 @@
 'use strict';
 
-const { implicitSetter, parseLengthOrPercentage, parseInteger } = require('../parsers');
+const { implicitSetter, parseLengthOrPercentage, parseKeyword } = require('../parsers');
 
-var isValid = function(v) {
-  if (v.toLowerCase() === 'auto') {
-    return true;
-  }
-  return parseLengthOrPercentage(v) !== undefined || parseInteger(v) !== undefined;
-};
+function parse(v) {
+  return parseKeyword(v, ['auto']) || parseLengthOrPercentage(v);
+}
 
-var parser = function(v) {
-  var V = v.toLowerCase();
-  if (V === 'auto') {
-    return V;
-  }
-  return parseLengthOrPercentage(v);
-};
+function isValid(v) {
+  return parse(v) !== undefined;
+}
 
-var mySetter = implicitSetter('margin', '', isValid, parser);
+var mySetter = implicitSetter('margin', '', isValid, parse);
 var myGlobal = implicitSetter(
   'margin',
   '',
@@ -53,4 +46,4 @@ module.exports.definition = {
 };
 
 module.exports.isValid = isValid;
-module.exports.parser = parser;
+module.exports.parser = parse;
diff --git a/lib/properties/width.js b/lib/properties/width.js
index 3c27ae8b..5c185a9f 100644
--- a/lib/properties/width.js
+++ b/lib/properties/width.js
@@ -1,15 +1,9 @@
 'use strict';
 
-const { parseLengthOrPercentage } = require('../parsers');
+const { parseKeyword, parseLengthOrPercentage } = require('../parsers');
 
 function parse(v) {
-  if (v.toLowerCase() === 'auto') {
-    return 'auto';
-  }
-  if (v.toLowerCase() === 'inherit') {
-    return 'inherit';
-  }
-  return parseLengthOrPercentage(v);
+  return parseKeyword(v, ['auto']) || parseLengthOrPercentage(v);
 }
 
 module.exports.definition = {