Bug 1973523 [wpt PR 53323] - cloneNode() and document's allow declarative shadow roots, a=testonly

Automatic update from web-platform-tests
cloneNode() and document's allow declarative shadow roots

For whatwg/dom#1384.

--

wpt-commits: 129b2b90e28996ed1bf234f7efd5da998f18474f
wpt-pr: 53323

Author: annevk

testing/web-platform/tests/dom/nodes/Node-cloneNode-document-allow-declarative-shadow-roots.window.js

@@ -0,0 +1,8 @@
+"use strict";
+
+test(() => {
+  const doc = document.cloneNode(document);
+  doc.write('<div><template shadowrootmode=open>test</template></div>');
+  assert_true(!!doc.body.firstChild.shadowRoot);
+  assert_equals(doc.body.firstChild.shadowRoot.textContent, "test");
+}, "cloneNode() and document's allow declarative shadow roots");