diff --git a/tests/csscolor-standard/config.yml b/tests/csscolor-standard/config.yml
new file mode 100644
index 0000000..b4ee95e
--- /dev/null
+++ b/tests/csscolor-standard/config.yml
@@ -0,0 +1,5 @@
+---
+  r: 0
+  spec: "http://www.w3.org/TR/css3-color/"
+  sources: ["https://github.com/Modernizr/Modernizr"]
+  title: "CSS3 Color, Standard"
diff --git a/tests/csscolor-standard/test.js b/tests/csscolor-standard/test.js
new file mode 100644
index 0000000..735206d
--- /dev/null
+++ b/tests/csscolor-standard/test.js
@@ -0,0 +1,9 @@
+test("CSS opacity, standard", function() {
+
+  var elem = document.createElement("div");
+
+  elem.style.cssText = "opacity:.55";
+
+  assert( /^0.55$/.test( elem.style.opacity ), "elem.style.opacity standard, supported" );
+
+});