css/cssom/overflow-serialization.html

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>CSSOM - Overflow shorthand serialization</title>
    <link rel="help" href="https://drafts.csswg.org/cssom/#serialize-a-css-value">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <style>
        div { overflow: inherit; }
        div { overflow: hidden; }
        div { overflow-x: initial; overflow-y: initial; }
        div { overflow-x: scroll; overflow-y: scroll; }
        div { overflow-x: scroll; overflow-y: hidden; }
    </style>

    <script>
    test(function () {
        var styleSheet = document.styleSheets[0];

        assert_equals(styleSheet.cssRules[0].style.cssText, "overflow: inherit;", "Single value overflow with CSS-wide keyword should serialize correctly.");
        assert_equals(styleSheet.cssRules[1].style.cssText, "overflow: hidden;", "Single value overflow with non-CSS-wide keyword should serialize correctly.");
        assert_equals(styleSheet.cssRules[2].style.cssText, "overflow: initial;", "Overflow-x/y longhands with same CSS-wide keyword should serialize correctly.");
        assert_equals(styleSheet.cssRules[3].style.cssText, "overflow: scroll;", "Overflow-x/y longhands with same non-CSS-wide keyword should serialize correctly.");
        assert_equals(styleSheet.cssRules[4].style.cssText, "overflow: scroll hidden;", "Overflow-x/y longhands with different keywords should serialize correctly.");

        var div = document.createElement('div');
        div.style.overflow = "inherit";
        assert_equals(div.style.overflow, "inherit", "Single value overflow with CSS-wide keyword should serialize correctly.");

        div.style.overflow = "hidden";
        assert_equals(div.style.overflow, "hidden", "Single value overflow with non-CSS-wide keyword should serialize correctly.");

        div.style.overflow = "";
        div.style.overflowX = "initial";
        div.style.overflowY = "initial";
        assert_equals(div.style.overflow, "initial", "Overflow-x/y longhands with same CSS-wide keyword should serialize correctly.");

        div.style.overflowX = "scroll";
        div.style.overflowY = "scroll";
        assert_equals(div.style.overflow, "scroll", "Overflow-x/y longhands with same non-CSS-wide keyword should serialize correctly.");

        div.style.overflowX = "scroll";
        div.style.overflowY = "hidden";
        assert_equals(div.style.overflow, "scroll hidden", "Overflow-x/y longhands with different keywords should serialize correctly.");
    });
    </script>
</head>
</html>