File: dialog-active-document.html

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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" href="mailto:masonf@chromium.org">
<link rel=help href="https://github.com/whatwg/html/pull/10705">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
  test(() => {
    const doc = document.implementation.createHTMLDocument();
    const dialog = doc.createElement('dialog');
    doc.body.appendChild(dialog);
    assert_throws_dom('InvalidStateError',() => dialog.showModal());
    assert_false(dialog.matches('[open]'));
  },'showModal should throw when the document isn\'t active');
</script>