diff --git a/docs/progress.html b/docs/progress.html
index 44d0c111..c6c76c4e 100644
--- a/docs/progress.html
+++ b/docs/progress.html
@@ -133,19 +133,19 @@ thead th {text-align:left;padding:0.1em;background-color:#EEE;}
 
 <tbody>
 <tr><th colspan="2">Standard</th></tr>
-<tr class="css1"><td>background-color</td><td>COMPOSITE(&lt;color&gt;, transparent)</td></tr>
+<tr class="css1 impl-yes"><td>background-color</td><td>COMPOSITE(&lt;color&gt;, transparent)</td></tr>
 <tr class="css1"><td>background</td><td>SHORTHAND</td></tr>
 <tr class="css1"><td>border</td><td>SHORTHAND, MULTIPLE</td></tr>
 <tr class="css1"><td>border-color</td><td>MULTIPLE</td></tr>
 <tr class="css1"><td>border-style</td><td>MULTIPLE</td></tr>
 <tr class="css1"><td>border-width</td><td>MULTIPLE</td></tr>
 <tr class="css1"><td>border-*</td><td>SHORTHAND</td></tr>
-<tr><td>border-*-color</td><td>COMPOSITE(&lt;color&gt;, transparent)</td></tr>
+<tr class="impl-yes"><td>border-*-color</td><td>COMPOSITE(&lt;color&gt;, transparent)</td></tr>
 <tr class="impl-yes"><td>border-*-style</td><td>ENUM(none, hidden, dotted, dashed,
     solid, double, groove, ridge, inset, outset)</td></tr>
 <tr class="css1"><td>border-*-width</td><td>COMPOSITE(&lt;length&gt;, thin, medium, thick)</td></tr>
 <tr class="css1 impl-yes"><td>clear</td><td>ENUM(none, left, right, both)</td></tr>
-<tr class="css1"><td>color</td><td>&lt;color&gt;</td></tr>
+<tr class="css1 impl-yes"><td>color</td><td>&lt;color&gt;</td></tr>
 <tr class="css1 impl-yes"><td>float</td><td>ENUM(left, right, none), May require layout
     precautions with clear</td></tr>
 <tr class="css1"><td>font</td><td>SHORTHAND</td></tr>
diff --git a/library/HTMLPurifier/AttrDef/Color.php b/library/HTMLPurifier/AttrDef/Color.php
new file mode 100644
index 00000000..c527b598
--- /dev/null
+++ b/library/HTMLPurifier/AttrDef/Color.php
@@ -0,0 +1,67 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+
+class HTMLPurifier_AttrDef_Color
+{
+    
+    function validate($color, $config, &$context) {
+        
+        $color = trim($color);
+        if (!$color) return false;
+        
+        if ($color[0] === '#') {
+            // hexadecimal handling
+            $hex = substr($color, 1);
+            $length = strlen($hex);
+            if ($length !== 3 && $length !== 6) return false;
+            if (!ctype_xdigit($hex)) return false;
+        } else {
+            // rgb literal handling
+            if (strpos($color, 'rgb(')) return false;
+            $length = strlen($color);
+            if (strpos($color, ')') !== $length - 1) return false;
+            $triad = substr($color, 4, $length - 4 - 1);
+            $parts = explode(',', $triad);
+            if (count($parts) !== 3) return false;
+            $type = false; // to ensure that they're all the same type
+            $new_parts = array();
+            foreach ($parts as $part) {
+                $part = trim($part);
+                if ($part === '') return false;
+                $length = strlen($part);
+                if ($part[$length - 1] === '%') {
+                    // handle percents
+                    if (!$type) {
+                        $type = 'percentage';
+                    } elseif ($type !== 'percentage') {
+                        return false;
+                    }
+                    $num = (float) substr($part, 0, $length - 1);
+                    if ($num < 0) $num = 0;
+                    if ($num > 100) $num = 100;
+                    $new_parts[] = "$num%";
+                } else {
+                    // handle integers
+                    if (!$type) {
+                        $type = 'integer';
+                    } elseif ($type !== 'integer') {
+                        return false;
+                    }
+                    $num = (int) $part;
+                    if ($num < 0) $num = 0;
+                    if ($num > 255) $num = 255;
+                    $new_parts[] = (string) $num;
+                }
+            }
+            $new_triad = implode(',', $new_parts);
+            $color = "rgb($new_triad)";
+        }
+        
+        return $color;
+        
+    }
+    
+}
+
+?>
\ No newline at end of file
diff --git a/library/HTMLPurifier/AttrDef/Composite.php b/library/HTMLPurifier/AttrDef/Composite.php
index bf18b31c..39efad0a 100644
--- a/library/HTMLPurifier/AttrDef/Composite.php
+++ b/library/HTMLPurifier/AttrDef/Composite.php
@@ -5,8 +5,8 @@ class HTMLPurifier_AttrDef_Composite extends HTMLPurifier_AttrDef
     
     var $defs;
     
-    function HTMLPurifier_AttrDef_Composite(&$defs) {
-        $this->defs =& $defs;
+    function HTMLPurifier_AttrDef_Composite($defs) {
+        $this->defs = $defs;
     }
     
     function validate($string, $config, &$context) {
diff --git a/library/HTMLPurifier/CSSDefinition.php b/library/HTMLPurifier/CSSDefinition.php
index 070aad86..f296fd76 100644
--- a/library/HTMLPurifier/CSSDefinition.php
+++ b/library/HTMLPurifier/CSSDefinition.php
@@ -43,6 +43,16 @@ class HTMLPurifier_CSSDefinition
             'upper-roman', 'lower-alpha', 'upper-alpha'), false);
         $this->info['text-transform'] = new HTMLPurifier_AttrDef_Enum(
             array('capitalize', 'uppercase', 'lowercase', 'none'), false);
+        $this->info['color'] = new HTMLPurifier_AttrDef_Color();
+        
+        $this->info['border-top-color'] = 
+        $this->info['border-bottom-color'] = 
+        $this->info['border-left-color'] = 
+        $this->info['border-right-color'] = 
+        $this->info['background-color'] = new HTMLPurifier_AttrDef_Composite( array(
+            new HTMLPurifier_AttrDef_Enum(array('transparent')),
+            new HTMLPurifier_AttrDef_Color()
+        ));
         
         // this could use specialized code
         $this->info['font-weight'] = new HTMLPurifier_AttrDef_Enum(
diff --git a/tests/HTMLPurifier/AttrDef/CSSTest.php b/tests/HTMLPurifier/AttrDef/CSSTest.php
index b23b0a7f..ab46d142 100644
--- a/tests/HTMLPurifier/AttrDef/CSSTest.php
+++ b/tests/HTMLPurifier/AttrDef/CSSTest.php
@@ -20,6 +20,10 @@ class HTMLPurifier_AttrDef_CSSTest extends HTMLPurifier_AttrDefHarness
         $this->assertDef('list-style-position:outside;');
         $this->assertDef('list-style-type:upper-roman;');
         $this->assertDef('text-transform:capitalize;');
+        $this->assertDef('background-color:rgb(0,0,255);');
+        $this->assertDef('background-color:transparent;');
+        $this->assertDef('color:#F00;');
+        $this->assertDef('border-top-color:#F00;');
         
         // duplicates
         $this->assertDef('text-align:right;text-align:left;',
diff --git a/tests/HTMLPurifier/AttrDef/ColorTest.php b/tests/HTMLPurifier/AttrDef/ColorTest.php
new file mode 100644
index 00000000..84ddff17
--- /dev/null
+++ b/tests/HTMLPurifier/AttrDef/ColorTest.php
@@ -0,0 +1,33 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef/Color.php';
+
+class HTMLPurifier_AttrDef_ColorTest extends HTMLPurifier_AttrDefHarness
+{
+    
+    function test() {
+        
+        $this->def = new HTMLPurifier_AttrDef_Color();
+        
+        $this->assertDef('#F00');
+        $this->assertDef('#808080');
+        $this->assertDef('rgb(255, 0, 0)', 'rgb(255,0,0)'); // rm spaces
+        $this->assertDef('rgb(100%,0%,0%)');
+        $this->assertDef('rgb(50.5%,23.2%,43.9%)'); // decimals okay
+        
+        $this->assertDef('#G00', false);
+        $this->assertDef('cmyk(40, 23, 43, 23)', false);
+        $this->assertDef('rgb(0%, 23, 68%)', false);
+        
+        // clip numbers outside sRGB gamut
+        $this->assertDef('rgb(200%, -10%, 0%)', 'rgb(100%,0%,0%)');
+        $this->assertDef('rgb(256,-23,34)', 'rgb(255,0,34)');
+        
+        // maybe hex transformations would be another nice feature
+        // at the very least transform rgb percent to rgb integer
+        
+    }
+    
+}
+
+?>
\ No newline at end of file
diff --git a/tests/HTMLPurifier/AttrDef/CompositeTest.php b/tests/HTMLPurifier/AttrDef/CompositeTest.php
index bd81db60..adc520a2 100644
--- a/tests/HTMLPurifier/AttrDef/CompositeTest.php
+++ b/tests/HTMLPurifier/AttrDef/CompositeTest.php
@@ -2,6 +2,16 @@
 
 require_once 'HTMLPurifier/AttrDef/Composite.php';
 
+class HTMLPurifier_AttrDef_Composite_Testable extends
+      HTMLPurifier_AttrDef_Composite
+{
+    
+    function HTMLPurifier_AttrDef_Composite_Testable(&$defs) {
+        $this->defs =& $defs;
+    }
+    
+}
+
 class HTMLPurifier_AttrDef_CompositeTest extends HTMLPurifier_AttrDefHarness
 {
     
@@ -20,7 +30,7 @@ class HTMLPurifier_AttrDef_CompositeTest extends HTMLPurifier_AttrDefHarness
         $def1 =& new HTMLPurifier_AttrDefMock($this);
         $def2 =& new HTMLPurifier_AttrDefMock($this);
         $defs = array(&$def1, &$def2);
-        $def =& new HTMLPurifier_AttrDef_Composite($defs);
+        $def =& new HTMLPurifier_AttrDef_Composite_Testable($defs);
         $input = 'FOOBAR';
         $output = 'foobar';
         $def1_params = array($input, $config, $context);
@@ -39,7 +49,7 @@ class HTMLPurifier_AttrDef_CompositeTest extends HTMLPurifier_AttrDefHarness
         $def1 =& new HTMLPurifier_AttrDefMock($this);
         $def2 =& new HTMLPurifier_AttrDefMock($this);
         $defs = array(&$def1, &$def2);
-        $def =& new HTMLPurifier_AttrDef_Composite($defs);
+        $def =& new HTMLPurifier_AttrDef_Composite_Testable($defs);
         $input = 'BOOMA';
         $output = 'booma';
         $def_params = array($input, $config, $context);
@@ -59,7 +69,7 @@ class HTMLPurifier_AttrDef_CompositeTest extends HTMLPurifier_AttrDefHarness
         $def1 =& new HTMLPurifier_AttrDefMock($this);
         $def2 =& new HTMLPurifier_AttrDefMock($this);
         $defs = array(&$def1, &$def2);
-        $def =& new HTMLPurifier_AttrDef_Composite($defs);
+        $def =& new HTMLPurifier_AttrDef_Composite_Testable($defs);
         $input = 'BOOMA';
         $output = false;
         $def_params = array($input, $config, $context);
diff --git a/tests/index.php b/tests/index.php
index cd9d7c5d..8028446b 100644
--- a/tests/index.php
+++ b/tests/index.php
@@ -65,6 +65,7 @@ $test_files[] = 'AttrDef/NumberSpanTest.php';
 $test_files[] = 'AttrDef/URITest.php';
 $test_files[] = 'AttrDef/CSSTest.php';
 $test_files[] = 'AttrDef/CompositeTest.php';
+$test_files[] = 'AttrDef/ColorTest.php';
 $test_files[] = 'IDAccumulatorTest.php';
 $test_files[] = 'TagTransformTest.php';
 $test_files[] = 'AttrTransform/LangTest.php';