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<!DOCTYPE html>
<meta charset="utf-8">
<title>All attributes accessors are unique function objects</title>
<link rel="help" href="https://webidl.spec.whatwg.org/#idl-interface-mixins">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
"use strict";
test(() => {
const seenPrototypes = new WeakSet([Function.prototype]);
const seenFunctions = new WeakMap();
for (const windowKey of Object.getOwnPropertyNames(window)) {
const windowValue = window[windowKey];
if (typeof windowValue !== "function") continue;
const {prototype} = windowValue;
if (!prototype || seenPrototypes.has(prototype)) continue;
seenPrototypes.add(prototype);
for (const key of Object.getOwnPropertyNames(prototype)) {
const assert_not_seen = (fn, field) => {
const fnInfo = `${windowKey}.${key}.${field}`;
assert_equals(seenFunctions.get(fn), undefined, fnInfo);
seenFunctions.set(fn, fnInfo);
};
const desc = Object.getOwnPropertyDescriptor(prototype, key);
if (desc.get) assert_not_seen(desc.get, "[[Get]]");
if (desc.set) assert_not_seen(desc.set, "[[Set]]");
}
}
}, "For attributes, each copy of the accessor property has distinct built-in function objects for its getters and setters.");
</script>
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