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chromium/third_party/blink/web_tests/external/wpt/selection/textcontrols/selectionchange-on-shadow-dom.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Test selectionchange events fired on shadow dom</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id="root"></div>

<script>
 let root = document.getElementById('root');
 let shadow = root.attachShadow({ mode: 'open' });
 let input = document.createElement('input');
 input.value = 'something to do 0';
 shadow.append(input);

 let events_on_document = [];
 document.addEventListener("selectionchange", ev => {
    events_on_document.push(ev);
});

promise_test(async () => {
    input.focus();
    events_on_document.length = 0;
    input.setSelectionRange(0, 1);
    await new Promise(resolve => step_timeout(resolve, 0));
    assert_equals(events_on_document.length, 1);
}, "selectionchange event fired on a shadow dom bubble to the document");
</script>