File: wm-propagation-body-computed-writing-mode.html

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<!DOCTYPE html>
<html>

<title>Computed root element writing-mode style when propagating writing-mode from body</title>
<link rel="help" href="https://www.w3.org/TR/css-writing-modes-3/#principal-flow">

<body>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script>
        const writingModes = ["horizontal-tb", "vertical-lr", "vertical-rl", "sideways-lr", "sideways-rl"];
        for (const rootWM of writingModes) {
            for (const bodyWM of writingModes) {
                test(function(t) {
                    t.add_cleanup(() => {
                        document.documentElement.style.removeProperty("writing-mode");
                        document.body.style.removeProperty("writing-mode");
                    });
                    document.documentElement.style.writingMode = rootWM;
                    document.body.style.writingMode = bodyWM;
                    assert_equals(getComputedStyle(document.documentElement).writingMode, rootWM, "root computed writing mode should be correct");
                    assert_equals(getComputedStyle(document.body).writingMode, bodyWM, "body computed writing mode should be correct");
                }, `Computed style is as specified with ${bodyWM} on body & ${rootWM} on html`);
            }
        }
    </script>
</body>

</html>