ProcessingInstruction-in-doctype.xhtml

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This WPT test may be referenced by the following Test IDs:
- /dom/nodes/ProcessingInstruction-in-doctype.xhtml - WPT Dashboard Interop Dashboard

<!DOCTYPE html [<?x y?>]><html xmlns="http://www.w3.org/1999/xhtml">

  <head>

    <title>XML: Processing instruction in doctype internal subset</title>

    <script src="/resources/testharness.js"></script>

    <script src="/resources/testharnessreport.js"></script>

  </head>

  <body>

    <script>

      test(() => {

        assert_equals(document.documentElement.previousSibling, document.firstChild);

        assert_equals(document.firstChild.nodeType, Node.DOCUMENT_TYPE_NODE);

});

    </script>

  </body>

</html>