diff --git a/NEWS b/NEWS
index 2aadbd02..6bc8a962 100644
--- a/NEWS
+++ b/NEWS
@@ -15,6 +15,7 @@ NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
 ! Added %URI.DisableResources functionality; the directive originally
   did nothing.  Thanks David Rothstein for reporting.
 ! Add documentation about configuration directive types.
+! Add %CSS.ForbiddenProperties configuration directive.
 - Fix improper handling of Internet Explorer conditional comments
   by parser.  Thanks zmonteca for reporting.
 - Fix missing attributes bug when running on Mac Snow Leopard and APC.
diff --git a/configdoc/usage.xml b/configdoc/usage.xml
index 444c3ad5..4086092d 100644
--- a/configdoc/usage.xml
+++ b/configdoc/usage.xml
@@ -42,6 +42,11 @@
    <line>275</line>
   </file>
  </directive>
+ <directive id="CSS.ForbiddenProperties">
+  <file name="HTMLPurifier/CSSDefinition.php">
+   <line>289</line>
+  </file>
+ </directive>
  <directive id="Cache.DefinitionImpl">
   <file name="HTMLPurifier/DefinitionCacheFactory.php">
    <line>49</line>
@@ -136,12 +141,12 @@
  </directive>
  <directive id="HTML.ForbiddenElements">
   <file name="HTMLPurifier/HTMLDefinition.php">
-   <line>337</line>
+   <line>342</line>
   </file>
  </directive>
  <directive id="HTML.ForbiddenAttributes">
   <file name="HTMLPurifier/HTMLDefinition.php">
-   <line>338</line>
+   <line>343</line>
   </file>
  </directive>
  <directive id="HTML.Trusted">
diff --git a/library/HTMLPurifier.includes.php b/library/HTMLPurifier.includes.php
index 2ed0f0c1..2de7f190 100644
--- a/library/HTMLPurifier.includes.php
+++ b/library/HTMLPurifier.includes.php
@@ -196,6 +196,7 @@ require 'HTMLPurifier/Token/Start.php';
 require 'HTMLPurifier/Token/Text.php';
 require 'HTMLPurifier/URIFilter/DisableExternal.php';
 require 'HTMLPurifier/URIFilter/DisableExternalResources.php';
+require 'HTMLPurifier/URIFilter/DisableResources.php';
 require 'HTMLPurifier/URIFilter/HostBlacklist.php';
 require 'HTMLPurifier/URIFilter/MakeAbsolute.php';
 require 'HTMLPurifier/URIFilter/Munge.php';
diff --git a/library/HTMLPurifier.safe-includes.php b/library/HTMLPurifier.safe-includes.php
index 6402de04..630daaa1 100644
--- a/library/HTMLPurifier.safe-includes.php
+++ b/library/HTMLPurifier.safe-includes.php
@@ -190,6 +190,7 @@ require_once $__dir . '/HTMLPurifier/Token/Start.php';
 require_once $__dir . '/HTMLPurifier/Token/Text.php';
 require_once $__dir . '/HTMLPurifier/URIFilter/DisableExternal.php';
 require_once $__dir . '/HTMLPurifier/URIFilter/DisableExternalResources.php';
+require_once $__dir . '/HTMLPurifier/URIFilter/DisableResources.php';
 require_once $__dir . '/HTMLPurifier/URIFilter/HostBlacklist.php';
 require_once $__dir . '/HTMLPurifier/URIFilter/MakeAbsolute.php';
 require_once $__dir . '/HTMLPurifier/URIFilter/Munge.php';
diff --git a/library/HTMLPurifier/CSSDefinition.php b/library/HTMLPurifier/CSSDefinition.php
index 6a2e6f56..f0257da0 100644
--- a/library/HTMLPurifier/CSSDefinition.php
+++ b/library/HTMLPurifier/CSSDefinition.php
@@ -272,20 +272,29 @@ class HTMLPurifier_CSSDefinition extends HTMLPurifier_Definition
         // setup allowed elements
         $support = "(for information on implementing this, see the ".
                    "support forums) ";
-        $allowed_attributes = $config->get('CSS.AllowedProperties');
-        if ($allowed_attributes !== null) {
+        $allowed_properties = $config->get('CSS.AllowedProperties');
+        if ($allowed_properties !== null) {
             foreach ($this->info as $name => $d) {
-                if(!isset($allowed_attributes[$name])) unset($this->info[$name]);
-                unset($allowed_attributes[$name]);
+                if(!isset($allowed_properties[$name])) unset($this->info[$name]);
+                unset($allowed_properties[$name]);
             }
             // emit errors
-            foreach ($allowed_attributes as $name => $d) {
+            foreach ($allowed_properties as $name => $d) {
                 // :TODO: Is this htmlspecialchars() call really necessary?
                 $name = htmlspecialchars($name);
                 trigger_error("Style attribute '$name' is not supported $support", E_USER_WARNING);
             }
         }
 
+        $forbidden_properties = $config->get('CSS.ForbiddenProperties');
+        if ($forbidden_properties !== null) {
+            foreach ($this->info as $name => $d) {
+                if (isset($forbidden_properties[$name])) {
+                    unset($this->info[$name]);
+                }
+            }
+        }
+
     }
 }
 
diff --git a/library/HTMLPurifier/ConfigSchema/schema.ser b/library/HTMLPurifier/ConfigSchema/schema.ser
index ac93a0c4..20bd89df 100644
Binary files a/library/HTMLPurifier/ConfigSchema/schema.ser and b/library/HTMLPurifier/ConfigSchema/schema.ser differ
diff --git a/library/HTMLPurifier/ConfigSchema/schema/CSS.ForbiddenProperties.txt b/library/HTMLPurifier/ConfigSchema/schema/CSS.ForbiddenProperties.txt
new file mode 100644
index 00000000..2e7d4a6c
--- /dev/null
+++ b/library/HTMLPurifier/ConfigSchema/schema/CSS.ForbiddenProperties.txt
@@ -0,0 +1,13 @@
+CSS.ForbiddenProperties
+TYPE: lookup
+VERSION: 4.1.2
+DEFAULT: array()
+--DESCRIPTION--
+<p>
+    This is the logical inverse of %CSS.AllowedProperties, and it will
+    override that directive or any other directive.  If possible,
+    %CSS.AllowedProperties is recommended over this directive,
+    because it can sometimes be difficult to tell whether or not you've
+    forbidden all of the CSS properties you truly would like to disallow.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/tests/HTMLPurifier/AttrDef/CSSTest.php b/tests/HTMLPurifier/AttrDef/CSSTest.php
index 27e5c432..619a78c9 100644
--- a/tests/HTMLPurifier/AttrDef/CSSTest.php
+++ b/tests/HTMLPurifier/AttrDef/CSSTest.php
@@ -144,6 +144,12 @@ class HTMLPurifier_AttrDef_CSSTest extends HTMLPurifier_AttrDefHarness
         $this->assertDef('overflow:scroll;');
     }
 
+    function testForbidden() {
+        $this->config->set('CSS.ForbiddenProperties', 'float');
+        $this->assertDef('float:left;', false);
+        $this->assertDef('text-align:right;');
+    }
+
 }
 
 // vim: et sw=4 sts=4