css/cssom/css-style-declaration-modifications.html

<!DOCTYPE html>
<html>
 <head>
  <title>CSS Test: CSSStyleDeclaration Interface</title>
  <link rel="author" title="Bear Travis" href="mailto:betravis@adobe.com">
  <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
  <meta name="flags" content="dom">
  <meta name="assert" content="CSSStyleDeclaration is properly initialized and can be modified through its interface">
  <script src="/resources/testharness.js" type="text/javascript"></script>
  <script src="/resources/testharnessreport.js" type="text/javascript"></script>
  <style id="styleElement">
      #test { color: green; }
  </style>
 </head>
 <body>
 <div id="log"></div>
 <div id="test"></div>
 <script type="text/javascript">
    var declaration;
    setup(function() {
        var styleElement = document.getElementById("styleElement");
        declaration = styleElement.sheet.cssRules.item(0).style;
    });

    test(function() {
        assert_equals(declaration.cssText, "color: green;");
        assert_equals(declaration.getPropertyValue("color"), "green");
    }, "Reading CSSStyleDeclaration initialized from a style element");

    test(function() {
        declaration.cssText = "margin-left:10px;  padding-left:10px";
        assert_equals(declaration.cssText, "margin-left: 10px; padding-left: 10px;");
        assert_equals(declaration.length, 2);
        assert_equals(declaration.item(0), "margin-left");
        assert_equals(declaration.item(1), "padding-left");
        assert_equals(declaration.getPropertyValue("margin-left"), "10px");
        assert_equals(declaration.getPropertyValue("padding-left"), "10px");

        var computedStyle = window.getComputedStyle(document.getElementById("test"));
        assert_equals(computedStyle.getPropertyValue("margin-left"), "10px");
        assert_equals(computedStyle.getPropertyValue("padding-left"), "10px");
    }, "Setting CSSStyleDeclaration#cssText");

    test(function() {
        while (declaration.length > 0) {
            declaration.removeProperty(declaration.item(0));
        }
        declaration.setProperty("margin-left", "15px");
        declaration.setProperty("padding-left", "15px");


        assert_equals(declaration.length, 2);
        assert_equals(declaration.item(0), "margin-left");
        assert_equals(declaration.item(1), "padding-left");
        assert_equals(declaration.getPropertyValue("margin-left"), "15px");
        assert_equals(declaration.getPropertyValue("padding-left"), "15px");

        var computedStyle = window.getComputedStyle(document.getElementById("test"));
        assert_equals(computedStyle.getPropertyValue("margin-left"), "15px");
        assert_equals(computedStyle.getPropertyValue("padding-left"), "15px");

    }, "Calling CSSStyleDeclaration#setProperty");

    test(function() {
        declaration.setProperty("background-color", "red", "ImPoRtAnt");
        assert_equals(declaration.getPropertyPriority("background-color"), "important");
    }, "setProperty priority should be case-insensitive");

 </script>
 </body>
</html>