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<!DOCTYPE html>
<meta charset="utf-8">
<title>Attributes are Nodes but should not be accepted outside of the `attributes` NamedNodeMap</title>
<link rel=help href="https://dom.spec.whatwg.org/#dom-core-changes">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
"use strict";
test(() => {
const attribute = document.createAttribute("newattribute");
assert_true(attribute instanceof Node, "attribute instances are instances of Node");
assert_true(Attr.prototype instanceof Node, "attribute instances are instances of Node");
}, "Attrs are subclasses of Nodes");
test(() => {
const parent = document.createElement("p");
const attribute = document.createAttribute("newattribute");
assert_throws_dom("HierarchyRequestError", () => {
parent.appendChild(attribute);
});
}, "appendChild with an attribute as the child should fail");
test(() => {
const parent = document.createElement("p");
parent.appendChild(document.createElement("span"));
const attribute = document.createAttribute("newattribute");
assert_throws_dom("HierarchyRequestError", () => {
parent.replaceChild(attribute, parent.firstChild);
});
}, "replaceChild with an attribute as the child should fail");
test(() => {
const parent = document.createElement("p");
parent.appendChild(document.createElement("span"));
const attribute = document.createAttribute("newattribute");
assert_throws_dom("HierarchyRequestError", () => {
parent.insertBefore(attribute, parent.firstChild);
});
}, "insertBefore with an attribute as the child should fail");
</script>
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