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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>Test that setting "onselectionchange" content attribute adds an event listener</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id="testElement" onselectionchange="window.handlerSetFromParserWasFired()"></div>
<script>
promise_test(() => {
return new Promise(resolve => {
window.handlerSetFromParserWasFired = resolve;
testElement.dispatchEvent(new Event("selectionchange"));
});
}, "handler set from parser");
promise_test(() => {
const el = document.createElement("div");
el.setAttribute("onselectionchange", "window.handlerSetViaSetAttributeWasFired()");
document.body.append(el);
return new Promise(resolve => {
window.handlerSetViaSetAttributeWasFired = resolve;
el.dispatchEvent(new Event("selectionchange"));
});
}, "handler set via setAttribute()");
</script>