declarative-shadow-dom-write-to-iframe.html

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This WPT test may be referenced by the following Test IDs:
- /shadow-dom/declarative/declarative-shadow-dom-write-to-iframe.html - WPT Dashboard Interop Dashboard

<!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>