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chromium/third_party/blink/web_tests/external/wpt/shadow-dom/input-type-radio.html 

<!doctype html>
<meta charset=utf-8>
<title></title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<input type="radio" name="group" id="lightRadio1">
<input type="radio" name="group" id="lightRadio2">
<div id="host"></div>
<script>

test(() => {
    var lightRadio1 = document.getElementById("lightRadio1");
    var lightRadio2 = document.getElementById("lightRadio2");

    var host = document.getElementById("host");
    var sr = host.attachShadow({mode: "closed"});
    var shadowRadio1 = document.createElement("input");
    shadowRadio1.name = "group";
    shadowRadio1.id = "shadowRadio1";
    shadowRadio1.type = "radio";
    sr.appendChild(shadowRadio1);
    var shadowRadio2 = document.createElement("input");
    shadowRadio2.name = "group";
    shadowRadio2.id = "shadowRadio2";
    shadowRadio2.type = "radio";
    sr.appendChild(shadowRadio2);

    assert_false(lightRadio1.checked);
    assert_false(lightRadio2.checked);
    assert_false(shadowRadio1.checked);
    assert_false(shadowRadio2.checked);

    lightRadio1.click();
    assert_true(lightRadio1.checked);
    assert_false(lightRadio2.checked);
    assert_false(shadowRadio1.checked);
    assert_false(shadowRadio2.checked);

    lightRadio2.click();
    assert_false(lightRadio1.checked);
    assert_true(lightRadio2.checked);
    assert_false(shadowRadio1.checked);
    assert_false(shadowRadio2.checked);

    shadowRadio1.click();
    assert_false(lightRadio1.checked);
    assert_true(lightRadio2.checked);
    assert_true(shadowRadio1.checked);
    assert_false(shadowRadio2.checked);

    shadowRadio2.click();
    assert_false(lightRadio1.checked);
    assert_true(lightRadio2.checked);
    assert_false(shadowRadio1.checked);
    assert_true(shadowRadio2.checked);

    // Ensure radio groups work even when modifying shadow DOM.
    shadowRadio2.remove();
    sr.appendChild(shadowRadio2);
    shadowRadio2.click();
    assert_false(lightRadio1.checked);
    assert_true(lightRadio2.checked);
    assert_false(shadowRadio1.checked);
    assert_true(shadowRadio2.checked);

    shadowRadio1.click();
    assert_false(lightRadio1.checked);
    assert_true(lightRadio2.checked);
    assert_true(shadowRadio1.checked);
    assert_false(shadowRadio2.checked);
}, "input type=radio elements should form a group inside shadow DOM.");

</script>