css/css-cascade/all-prop-initial-xml.html

<!doctype html>
<title>all: initial on unknown XML tree</title>
<link rel=help href=https://www.w3.org/TR/css-cascade-3/#all-shorthand>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
const iframe = document.createElement("iframe");
const setup_test = async_test("setup");
iframe.onload = setup_test.step_func_done(function() {
    const root = iframe.contentDocument.documentElement;
    // we need the empty stylesheet to avoid default XSLT views of the XML
    const style = iframe.contentDocument.createElementNS("http://www.w3.org/1999/xhtml", "style");
    root.appendChild(style);

    // Grab initial styles from a random element, as the root can get non-initial UA styling.
    const div = iframe.contentDocument.createElementNS("http://www.w3.org/1999/xhtml", "div");
    root.appendChild(div);
    // the document element should have unicode-bidi 'normal', while <div> has 'isolate':
    div.style.unicodeBidi = 'normal';
    const cs = iframe.contentWindow.getComputedStyle(div);

    let actual_initial = Object.create(null);
    for (let i = 0; i < cs.length; i++) {
        let prop_name = cs[i];
        actual_initial[prop_name] = cs[prop_name];
    }
    const rootCS = iframe.contentWindow.getComputedStyle(root);
    test(() => {
        style.textContent = ":root { color: blue }";
        assert_equals(rootCS["color"], "rgb(0, 0, 255)");
    }, "stylesheet takes effect");
    style.textContent = ":root { all: initial; direction: initial; unicode-bidi: initial; } style { display: none; }";
    for (let prop_name in actual_initial) {
        test(() => {
            assert_equals(rootCS[prop_name], actual_initial[prop_name]);
        }, prop_name);
    }
});
iframe.src = URL.createObjectURL(new Blob(["<foo/>"], { type: "application/xml" }));
document.body.appendChild(iframe);
</script>