foster-parenting-into-document-with-element-child.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/syntax/parsing/foster-parenting-into-document-with-element-child.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Foster parenting into another Document that already has an element child</title>

<link rel="help" href="https://html.spec.whatwg.org/multipage/parsing.html#insert-an-element-at-the-adjusted-insertion-location">

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

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

<body>

<script>

// The inline script makes the on-stack <table> the document element of a second

// Document; the following <b> is then foster-parented into that Document, which

// already has an element child, and so must be dropped on the floor.

const SRCDOC = `<table><tr><script>

  var other = document.implementation.createHTMLDocument("");

  other.documentElement.remove();

  other.appendChild(document.querySelector("table"));

  window.other = other;

<\/script><b id="fostered">x</b>`;

async_test(t => {

  const iframe = document.createElement("iframe");

  iframe.srcdoc = SRCDOC;

  iframe.onload = t.step_func_done(() => {

    const other = iframe.contentWindow.other;

    const table = other.querySelector("table");

    assert_true(!!table, "table was moved into the second Document");

    assert_equals(table.parentNode, other, "table is the second Document's child");

    const outcome = other.getElementById("fostered") ? "inserted-into-second-document"

                  : iframe.contentDocument.getElementById("fostered") ? "inserted-into-iframe-document"

                  : "dropped";

    assert_equals(outcome, "dropped", "the foster-parented <b> should be dropped on the floor");

    assert_equals(other.childElementCount, 1, "the second Document should still have one element child (the table)");

});

  document.body.appendChild(iframe);

}, "A foster-parented element whose adjusted insertion location is another Document that already has an element child is dropped on the floor");

</script>