css/css-variables/variable-invalidation.html

<!DOCTYPE html>
<html>
<head>
    <title>Tests css variable invalidation</title>

    <meta rel="author" title="Kevin Babbitt">
    <meta rel="author" title="Greg Whitworth">
    <link rel="author" title="Microsoft Corporation" href="http://microsoft.com" />
    <!-- This is not directly specified in the spec but should work -->
    <link rel="help" href="http://www.w3.org/TR/css-variables-1/#defining-variables">

    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <style>
        #test1 {
            --var1:red;
        }
        #test2 {
            --var2:red!important;
        }
    </style>
</head>
<body>
    <div id="test1"><div><div><div class="testElem"></div></div></div></div>
    <div id="test2"><div><div><div class="testElem"></div></div></div></div>
    <div id="test3" style="--var3:red"><div><div><div class="testElem"></div></div></div></div>
    <div id="test4" style="--var4:red!important"><div><div><div class="testElem"></div></div></div></div>

    <script type="text/javascript">
        "use strict";

        // This is a helper function to avoid repitition
        function testExpectations(testProperty, cssStyle, testElement, testDescription, expectedValue, expectedCssText, expectedPriority, expectedLength, expectedItem0) {
            assert_equals(cssStyle.cssText, expectedCssText, "cssText " + testDescription + ".");
            assert_equals(cssStyle.getPropertyValue(testProperty), expectedValue, "Value " + testDescription + ".");
            assert_equals(cssStyle.getPropertyPriority(testProperty), expectedPriority, "Priority " + testDescription + ".");
            assert_equals(cssStyle.length, expectedLength, "style length " + testDescription + ".");
            assert_equals(cssStyle.item(0), expectedItem0, "item(0) " + testDescription + ".");

            var computedStyle = window.getComputedStyle(testElement);
            assert_equals(computedStyle.getPropertyValue(testProperty), expectedValue, "Computed Style value " + testDescription + ".");
        }

        // This is a boilerplate to build a testcase and then test the expected outcome
        function testCase(cssStyle, testProperty, testElement, testImportant) {
            var initialCssText = testProperty + (testImportant ? ": red !important;" : ": red;");

            testExpectations(testProperty, cssStyle, testElement, "initial", "red", initialCssText, testImportant ? "important" : "", 1, testProperty);

            cssStyle.setProperty(testProperty, "blue");

            if (!testImportant) {
                testExpectations(testProperty, cssStyle, testElement, "after setProperty", "blue", testProperty + ": blue;", "", 1, testProperty);
            }

            if (testProperty) {
                cssStyle.setProperty(testProperty, "pink", 'important');
                testExpectations(testProperty, cssStyle, testElement, "after setProperty important", "pink", testProperty + ": pink !important;", "important", 1, testProperty);
            }

            cssStyle.removeProperty(testProperty);
            testExpectations(testProperty, cssStyle, testElement, "after removeProperty", "", "", "", 0, "");

            var cssText = testProperty + (testImportant ? ":green!important;" : ":green;");
            var expectedCssText = testProperty + (testImportant ? ": green !important;" : ": green;");
            cssStyle.cssText = cssText;
            testExpectations(testProperty, cssStyle, testElement, "after setting cssText", "green", expectedCssText, testImportant ? "important" : "", 1, testProperty);
        }

        // The actual tests that utilize the boilerplate & helper methods above
        test( function () {
            var cssStyle = document.styleSheets[0].cssRules[0].style;
            var testProperty = "--var1";
            var testElement = document.querySelectorAll("#test1 .testElem")[0];

            testCase(cssStyle, testProperty, testElement, false);
        }, "css rule test");

        test( function () {
            var cssStyle = document.styleSheets[0].cssRules[1].style;
            var testProperty = "--var2";
            var testElement = document.querySelectorAll("#test2 .testElem")[0];

            testCase(cssStyle, testProperty, testElement, true);
        }, "css rule test important");

        test( function () {
            var element = document.getElementById("test3");
            var cssStyle = element.style;
            var testProperty = "--var3";
            var testElement = document.querySelectorAll("#test3 .testElem")[0];

            testCase(cssStyle, testProperty, testElement, false);
        }, "inline style test");

        test( function () {
            var element = document.getElementById("test4");
            var cssStyle = element.style;
            var testProperty = "--var4";
            var testElement = document.querySelectorAll("#test4 .testElem")[0];

            testCase(cssStyle, testProperty, testElement, true);
        }, "inline style test important");
    </script>
</body>
</html>