Carry over AllowDeclarativeShadowRoot state when parser created via d…

…ocument.write. Differential Revision: https://phabricator.services.mozilla.com/D208747 bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1892882 gecko-commit: c7a7a9e47f66581211046deb5ce4a4279ba3cca0 gecko-reviewers: dom-core, hsivonen
web-platform-tests · May 15, 2024 · 74aad7d · 74aad7d
1 parent 5fe29b5
commit 74aad7d
Showing 1 changed file with 22 additions and 0 deletions.
diff --git a/shadow-dom/declarative/declarative-shadow-dom-write-to-iframe.html b/shadow-dom/declarative/declarative-shadow-dom-write-to-iframe.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>`document.write` on inner iframe handles declarative shadow DOM</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe></iframe>
+<script>
+promise_test(async () => {
+  await new Promise(res => window.addEventListener("load", res));
+  let elem = document.querySelector("iframe");
+  elem.contentDocument.write(`
+    <div>
+      <template shadowrootmode="open"><slot></slot></template>
+      <p>Test</p>
+    </div>
+  `);
+  let container = elem.contentDocument.querySelector("div");
+  assert_true(!!container, "write should occur");
+  assert_true(!!container.shadowRoot, "write should create shadowroot");
+  assert_equals(container.innerText, "Test", "div should still contain text");
+}, "`document.write` on inner iframe handles declarative shadow DOM");
+</script>