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<!DOCTYPE html>
<meta charset="utf-8">
<title>Selectionchange event fired on document if TextControl element is in Shadow Tree</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="root"></div>
<script>
const root = document.getElementById("root");
const shadow = root.attachShadow({ mode: "open" });
const element = document.createElement("input");
element.value = "hello";
shadow.append(element);
const events_on_document = [];
document.addEventListener("selectionchange", ev => {
events_on_document.push(ev);
});
const events_on_input = [];
element.addEventListener("selectionchange", ev => {
events_on_input.push(ev);
});
promise_test(async () => {
element.focus();
element.setSelectionRange(5, 5);
await new Promise(resolve => step_timeout(resolve, 500));
events_on_document.length = 0;
events_on_input.length = 0;
document.execCommand("delete");
// Waits a short time to allow any events to be processed.
await new Promise(resolve => step_timeout(resolve, 500));
const expectedValue = "hell";
assert_equals(element.value, expectedValue, "element.value should be " + expectedValue);
//selectionchange event should not fire on input element
assert_equals(events_on_input.length, 0);
//selectionchange event should fire on the document
assert_equals(events_on_document.length, 1);
assert_equals(events_on_document[0].target, document, "Event target should be the document");
}, "selectionchange event fired on the document in case TextControl element is in Shadow Tree");
</script>
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