[3.0.0] [BACKPORT] More work for hire from Chris

! Experimental support for some proprietary CSS attributes allowed: opacity (and all of the browser-specific equivalents) and scrollbar colors. Enable by setting %CSS.Proprietary to true.
- Colors missing # but in hex form will be corrected
- CSS Number algorithm improved
. New classes:
  + HTMLPurifier_AttrDef_CSS_AlphaValue
  + HTMLPurifier_AttrDef_CSS_Filter

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1473 48356398-32a2-884e-a903-53898d9a118a

tests/HTMLPurifier/AttrDef/CSS/AlphaValueTest.php

@@ -0,0 +1,30 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef/CSS/AlphaValue.php';
+require_once 'HTMLPurifier/AttrDefHarness.php';
+
+class HTMLPurifier_AttrDef_CSS_AlphaValueTest extends HTMLPurifier_AttrDefHarness
+{
+    
+    function test() {
+        
+        $this->def = new HTMLPurifier_AttrDef_CSS_AlphaValue();
+        
+        $this->assertDef('0');
+        $this->assertDef('1');
+        $this->assertDef('.2');
+        
+        // clamping to [0.0, 1,0]
+        $this->assertDef('1.2', '1');
+        $this->assertDef('-3', '0');
+        
+        $this->assertDef('0.0', '0');
+        $this->assertDef('1.0', '1');
+        $this->assertDef('000', '0');
+        
+        $this->assertDef('asdf', false);
+        
+    }
+    
+}
+