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<!DOCTYPE html>
<meta charset="utf-8">
<title>Named access on the window object - changing attributes</title>
<link rel="author" title="Matthew Phillips" href="mailto:matthew@matthewphillips.info">
<link rel="help" href="https://html.spec.whatwg.org/#named-access-on-the-window-object">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
"use strict";
test(() => {
const img = document.createElement("img");
document.body.appendChild(img);
img.setAttribute("id", "changing-one");
assert_equals(window["changing-one"], img);
img.setAttribute("id", "changing-two");
assert_false("changing-one" in window);
assert_equals(window["changing-two"], img);
}, "Changing an attribute must update the named properties (id)");
test(() => {
const img = document.createElement("img");
document.body.appendChild(img);
img.setAttribute("name", "changing-name-one");
assert_equals(window["changing-name-one"], img);
img.setAttribute("name", "changing-name-two");
assert_false("changing-name-one" in window);
assert_equals(window["changing-name-two"], img);
}, "Changing an attribute must update the named properties (name)");
test(() => {
const img = document.createElement("img");
document.body.appendChild(img);
img.setAttribute("name", "still-match");
img.setAttribute("id", "still-match");
assert_equals(window["still-match"], img);
img.setAttribute("id", "other");
assert_equals(window["still-match"], img);
}, "Changing an attribute must not remove the named properties if a different attribute still matches (id)");
test(() => {
const img = document.createElement("img");
document.body.appendChild(img);
img.setAttribute("name", "still-match-name");
img.setAttribute("id", "still-match-name");
assert_equals(window["still-match-name"], img);
img.setAttribute("name", "other");
assert_equals(window["still-match-name"], img);
}, "Changing an attribute must not remove the named properties if a different attribute still matches (name)");
test(() => {
const img = document.createElement("img");
img.setAttribute("alt", "Cat pictures on the internet");
img.setAttribute("id", "no-errors");
document.body.appendChild(img);
assert_equals(window["no-errors"], img);
img.setAttribute("alt", "Dog pictures on the internet");
assert_equals(window["no-errors"], img);
}, "Changing an attribute that is not id or name must not cause errors");
</script>
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