css/css-variables/variable-substitution-variable-declaration.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Testing substituting variable references inside of variable declerations</title>

    <meta rel="author" title="Kevin Babbitt">
    <meta rel="author" title="Greg Whitworth">
    <link rel="author" title="Microsoft Corporation" href="http://microsoft.com" />
    <link rel="help" href="http://www.w3.org/TR/css-variables-1/#using-variables">

    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <style>
        #target1 {
            margin: var(--var2);
            --var2: var(--var1) 10px;
            --var1: var(--var0) 13px 17px;
            --var0: 23px;
        }

        #target2parent {
            --var2: var(--var1, fallback);
            --var1: var(--var2, fallback);
        }
        #target2 {
            --var1: good;
        }

        #target3 {
            --var2: var(--var1, 3px);
            --var1: var(--var0, 5px);
        }

        #target4 {
            --varA: var(--varB);
            --varB: var(--varA);
            --varC: var(--varB,13px);
        }

        #target5 {
            --varA: var(--varB);
            --varB: var(--varA) var(--varC);
            --varC: var(--varB,13px);
        }

        #target6 {
            --varA: var(--varB);
            --varB: var(--varA) var(--varDoesNotExist,var(--varC));
            --varC: var(--varB,13px);
        }

        #target7 {
            --varDoesExist: 5px;
            --varA: var(--varB);
            --varB: var(--varA) var(--varDoesExist,var(--varC));
            --varC: var(--varB,13px);
        }

        #target8 {
            --varA: var(--varA, 9px);
            --varB: var(--varA, 7px);
        }

        #target9 {
            --varA: good;
            --varB: very var(--varA, var(--varC));
            --varC: var(--varB);
        }

        #target10parent {
            --varA: good;
            --varB: Also good;
            --varC: another good one;
        }

        #target10 {
            --varA: var(--varB);
            --varB: var(--varA);
            --varC: var(--varB);
        }
    </style>
</head>
<body>
    <div id="target1"></div>
    <div id="target2parent">
        <div id="target2"></div>
    </div>
    <div id="target3"></div>
    <div id="target4"></div>
    <div id="target5"></div>
    <div id="target6"></div>
    <div id="target7"></div>
    <div id="target8"></div>
    <div id="target9"></div>
    <div id="target10parent">
        <div id="target10"></div>
    </div>

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

        var testcases = [
            { element: "target1",       propertyName: "--var2",         expectedPropertyValue: "23px 13px 17px 10px" },
            { element: "target1",       propertyName: "margin-top",     expectedPropertyValue: "23px" },
            { element: "target1",       propertyName: "margin-right",   expectedPropertyValue: "13px" },
            { element: "target1",       propertyName: "margin-bottom",  expectedPropertyValue: "17px" },
            { element: "target1",       propertyName: "margin-left",    expectedPropertyValue: "10px" },

            { element: "target2parent", propertyName: "--var1",         expectedPropertyValue: "" },
            { element: "target2parent", propertyName: "--var2",         expectedPropertyValue: "" },
            { element: "target2",       propertyName: "--var1",         expectedPropertyValue: "good" },
            { element: "target2",       propertyName: "--var2",         expectedPropertyValue: "" },

            { element: "target3",       propertyName: "--var1",         expectedPropertyValue: "5px" },
            { element: "target3",       propertyName: "--var2",         expectedPropertyValue: "5px" },

            { element: "target4",       propertyName: "--varA",         expectedPropertyValue: "" },
            { element: "target4",       propertyName: "--varB",         expectedPropertyValue: "" },
            { element: "target4",       propertyName: "--varC",         expectedPropertyValue: "13px" },

            { element: "target5",       propertyName: "--varA",         expectedPropertyValue: "" },
            { element: "target5",       propertyName: "--varB",         expectedPropertyValue: "" },
            { element: "target5",       propertyName: "--varC",         expectedPropertyValue: "" },

            { element: "target6",       propertyName: "--varA",         expectedPropertyValue: "" },
            { element: "target6",       propertyName: "--varB",         expectedPropertyValue: "" },
            { element: "target6",       propertyName: "--varC",         expectedPropertyValue: "13px" },

            { element: "target7",       propertyName: "--varA",         expectedPropertyValue: "" },
            { element: "target7",       propertyName: "--varB",         expectedPropertyValue: "" },
            { element: "target7",       propertyName: "--varC",         expectedPropertyValue: "13px" },

            { element: "target8",       propertyName: "--varA",         expectedPropertyValue: "" },
            { element: "target8",       propertyName: "--varB",         expectedPropertyValue: "7px" },

            { element: "target9",       propertyName: "--varA",         expectedPropertyValue: "good" },
            { element: "target9",       propertyName: "--varB",         expectedPropertyValue: "very good" },
            { element: "target9",       propertyName: "--varC",         expectedPropertyValue: "very good" },

            { element: "target10",      propertyName: "--varA",         expectedPropertyValue: "" },
            { element: "target10",      propertyName: "--varB",         expectedPropertyValue: "" },
            { element: "target10",      propertyName: "--varC",         expectedPropertyValue: "" },
        ];

        testcases.forEach(function (testcase) {
            test( function () {
                var div = document.getElementById(testcase.element);
                var actualPropertyValue = window.getComputedStyle(div).getPropertyValue(testcase.propertyName);
                assert_equals(actualPropertyValue, testcase.expectedPropertyValue);
            }, testcase.element + " " + testcase.propertyName);
        });
    </script>
</body>
</html>