Adding csscolor test.

tests/csscolor/config.yml

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+---
+  r: 0
+  spec: "http://www.w3.org/TR/css3-color/"
+  sources: ["https://github.com/Modernizr/Modernizr"]
+  title: "CSS3 Color"

tests/csscolor/test.js

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+test("CSS opacity", function() {
+
+  // Browsers that actually have CSS Opacity implemented have done so
+  //  according to spec, which means their return values are within the
+  //  range of [0.0,1.0] - including the leading zero.
+
+  var
+  elem = document.createElement("div"),
+  baseRule = "opacity:.55",
+  rules = H.prefixes.expandCss( baseRule );
+
+  elem.style.cssText = rules;
+
+  // The non-literal . in this regex is intentional:
+  //   German Chrome returns this value as 0,55
+  // github.com/Modernizr/Modernizr/issues/#issue/59/comment/516632
+  assert( /^0.55$/.test( elem.style.opacity ), "CSS opacity supported" );
+
+});
+
+test("CSS color properties, RGBA support", function() {
+
+  var elem = document.createElement("div");
+
+  // Set an rgba() color and check the returned value
+
+  elem.style.cssText = "background-color:rgba(150,255,150,.5)";
+
+  assert( H.test.string( elem.style.backgroundColor, "rgba" ), "RGBA color supported" );
+
+});
+
+test("CSS color properties, HSLA support", function() {
+
+  var bgcolor,
+  elem = document.createElement("div");
+
+  // Same as rgba(), in fact, browsers re-map hsla() to rgba() internally,
+  //   except IE9 who retains it as hsla
+
+  elem.style.cssText = "background-color:hsla(120,40%,100%,.5)";
+
+  bgcolor = elem.style.backgroundColor;
+
+  assert( H.test.string( bgcolor, "rgba" ) || H.test.string( bgcolor, "hsla" ), "HSLA color supported" );
+
+});