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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>MutationObserver: callback arguments</title>
<link rel="help" href="https://dom.spec.whatwg.org/#notify-mutation-observers">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="mo-target"></div>
<div id="log"></div>
<script>
"use strict";
async_test(t => {
const moTarget = document.querySelector("#mo-target");
const mo = new MutationObserver(function(records, observer) {
t.step(() => {
assert_equals(this, mo);
assert_equals(arguments.length, 2);
assert_true(Array.isArray(records));
assert_equals(records.length, 1);
assert_true(records[0] instanceof MutationRecord);
assert_equals(observer, mo);
mo.disconnect();
t.done();
});
});
mo.observe(moTarget, {attributes: true});
moTarget.className = "trigger-mutation";
}, "Callback is invoked with |this| value of MutationObserver and two arguments");
</script>
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