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Test Info:

<!doctype html>
<meta charset=utf-8>
<title></title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id="testDiv" onclick="result1 = remove; result2 = this.remove;"></div>
<script>
var result1;
var result2;
var unscopables = [
"before",
"after",
"replaceWith",
"remove",
"prepend",
"append"
];
for (var i in unscopables) {
var name = unscopables[i];
window[name] = "Hello there";
result1 = result2 = undefined;
test(function () {
assert_true(Element.prototype[Symbol.unscopables][name]);
var div = document.querySelector('#testDiv');
div.setAttribute(
"onclick", "result1 = " + name + "; result2 = this." + name + ";");
div.dispatchEvent(new Event("click"));
assert_equals(typeof result1, "string");
assert_equals(typeof result2, "function");
}, name + "() should be unscopable");
}
</script>