Adding cssbackground test.

tests/cssbackground/config.yml

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

tests/cssbackground/test.js

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+test("CSS background shorthand property supports multiple images", function() {
+
+  var elem = document.createElement("div");
+
+  // Setting multiple images AND a color on the background shorthand property
+  //  and then querying the style.background property value for the number of
+  //  occurrences of "url(" is a reliable method for detecting ACTUAL support for this!
+
+  elem.style.cssText = "background:url(https://),url(https://),red url(https://)";
+
+  // If the UA supports multiple backgrounds, there should be three occurrences
+  //   of the string "url(" in the return value for elem.style.background
+
+  assert( /(url\s*\(.*?){3}/.test( elem.style.background ), "background shorthand, multiple images supported" );
+
+});
+
+test("CSS background-image, background-position, background-repeat support multiple images", function() {
+
+  var elem = document.createElement("div"),
+
+  rule =  "background-image:url(https://),url(https://);" +
+          "background-color: #000;" +
+          "background-position:left top, right top;" +
+          "background-repeat:repeat-x, no-repeat;";
+
+  elem.style.cssText = rule;
+
+  // If the UA supports multiple backgrounds, there should be two occurrences
+  //   of the string "url(" in the return value for elem.style.background
+
+  assert( /(url\s*\(.*?){2}/.test( elem.style.background ), "CSS background-image, background-position, background-repeat support multiple images supported" );
+
+});
+
+
+test("CSS box-shadow", function() {
+  // According to the Modernizr source
+  // This test false-positives in WebOS
+  var elem = document.createElement("div");
+
+  assert( H.test.cssProp( elem, "boxShadow", true ), "CSS box-shadow supported" );
+
+});
+
+test("CSS border-radius", function() {
+
+  var elem = document.createElement("div");
+
+  assert( H.test.cssProp( elem, "borderRadius", true ), "CSS border-radius supported" );
+
+});