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Test Info:

<!DOCTYPE html>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
var range = document.createRange();
var rangeContainer = document.createElement('div');
range.setStart(rangeContainer, 0);
range.setEnd(rangeContainer, 0);
var shadowRoot = document.createElement('span').attachShadow({mode: "open"});
var h1 = shadowRoot.appendChild(document.createElement('h1'));
range.insertNode(shadowRoot);
assert_equals(rangeContainer.firstChild, h1);
}, 'Test if Range.prototype.insertNode() should accept ShadowRoot input.');
</script>
</body>