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async_test(t => {
const frame = document.createElement("iframe");
document.body.append(frame);
frame.contentWindow.eval(`
class AA extends HTMLElement { };
self.globalAA = AA;
customElements.define("a-a", AA);
document.body.innerHTML = "<a-a>";
`);
assert_equals(frame.contentDocument.body.firstChild.localName, "a-a");
assert_true(frame.contentDocument.body.firstChild instanceof frame.contentWindow.globalAA);
const blankDocumentURL = new URL("/common/blank.html", location).href;
frame.src = blankDocumentURL;
frame.onload = t.step_func_done(t => {
assert_equals(frame.contentDocument.URL, blankDocumentURL);
assert_equals(frame.contentDocument.body.innerHTML, "");
frame.contentDocument.body.innerHTML = "<a-a>";
assert_equals(frame.contentDocument.body.firstChild.localName, "a-a");
assert_equals(frame.contentWindow.customElements.get("a-a"), undefined);
assert_not_equals(frame.contentWindow.globalAA, undefined);
});
}, "Each navigable document has its own registry");