diff --git a/library/HTMLPurifier/AttrDef/Integer.php b/library/HTMLPurifier/AttrDef/Integer.php
new file mode 100644
index 00000000..3c647173
--- /dev/null
+++ b/library/HTMLPurifier/AttrDef/Integer.php
@@ -0,0 +1,37 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+
+// appears to be a dud class: no currently allowed CSS uses this type
+// Uses this: widows, orphans, z-index, counter-increment, counter-reset
+
+class HTMLPurifier_AttrDef_Integer extends HTMLPurifier_AttrDef
+{
+    
+    var $non_negative = false;
+    
+    function HTMLPurifier_AttrDef_Integer($non_negative = false) {
+        $this->non_negative = $non_negative;
+    }
+    
+    function validate($integer, $config, &$context) {
+        
+        $integer = $this->parseCDATA($integer);
+        if ($integer === '') return false;
+        
+        if ( !$this->non_negative && $integer[0] === '-' ) {
+            $digits = substr($integer, 1);
+        } elseif( $integer[0] === '+' ) {
+            $digits = $integer = substr($integer, 1);
+        } else {
+            $digits = $integer;
+        }
+        
+        if (!ctype_digit($digits)) return false;
+        return $integer;
+        
+    }
+    
+}
+
+?>
\ No newline at end of file
diff --git a/tests/HTMLPurifier/AttrDef/IntegerTest.php b/tests/HTMLPurifier/AttrDef/IntegerTest.php
new file mode 100644
index 00000000..00d5831c
--- /dev/null
+++ b/tests/HTMLPurifier/AttrDef/IntegerTest.php
@@ -0,0 +1,38 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef/Integer.php';
+
+class HTMLPurifier_AttrDef_IntegerTest extends HTMLPurifier_AttrDefHarness
+{
+    
+    function test() {
+        
+        $this->def = new HTMLPurifier_AttrDef_Integer();
+        
+        $this->assertDef('0');
+        $this->assertDef('1');
+        $this->assertDef('-1');
+        $this->assertDef('-10');
+        $this->assertDef('14');
+        $this->assertDef('+24', '24');
+        $this->assertDef(' 14 ', '14');
+        
+        $this->assertDef('-1.4', false);
+        $this->assertDef('3.4', false);
+        $this->assertDef('asdf', false);
+        
+    }
+    
+    function testNonNegative() {
+        
+        $this->def = new HTMLPurifier_AttrDef_Integer(true);
+        
+        $this->assertDef('0');
+        $this->assertDef('1');
+        $this->assertDef('-1', false);
+        
+    }
+    
+}
+
+?>
\ No newline at end of file
diff --git a/tests/index.php b/tests/index.php
index 8028446b..c035dd6a 100644
--- a/tests/index.php
+++ b/tests/index.php
@@ -66,6 +66,7 @@ $test_files[] = 'AttrDef/URITest.php';
 $test_files[] = 'AttrDef/CSSTest.php';
 $test_files[] = 'AttrDef/CompositeTest.php';
 $test_files[] = 'AttrDef/ColorTest.php';
+$test_files[] = 'AttrDef/IntegerTest.php';
 $test_files[] = 'IDAccumulatorTest.php';
 $test_files[] = 'TagTransformTest.php';
 $test_files[] = 'AttrTransform/LangTest.php';