adoption-agency-reparenting-pagehide.tentative.html

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This WPT test may be referenced by the following Test IDs:
- /html/syntax/parsing/adoption-agency-reparenting-pagehide.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Adoption agency: script running mid-algorithm via pagehide</title>

<link rel="help" href="https://html.spec.whatwg.org/multipage/parsing.html#adoption-agency-algorithm">

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

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

<script src="resources/adoption-agency-reparenting.js"></script>

<body>

<script>

// TENTATIVE: pagehide is not defined to fire here at all. Removing an iframe

// destroys its document; it does not unload it, and pagehide is only fired when

// unloading (cross-document navigation, or closing a top-level traversable). This

// test relies on engines firing it on disconnection instead.

//

// The adoption agency moves the furthest block (#fb), disconnecting the <iframe>

// inside it, and the pagehide handler nests the common ancestor (#ca) inside #fb.

// So unlike the other cycle tests, the mutation happens *during* the algorithm,

// making any check performed before the move stale.

const SRCDOC = `<div id=ca><b><p id=fb><iframe id=trap></iframe><script>

window.handlerRan = false;

window.ca = document.getElementById('ca');

window.fb = document.getElementById('fb');

document.getElementById('trap').contentWindow.onpagehide = function() {

  window.handlerRan = true;

  window.fb.remove();

  window.fb.appendChild(window.ca);

};

<\/script></b></div>`;

// Walk up parentNode, failing on repetition or an implausibly long chain.

function ancestorChainIsAcyclic(node) {

  const seen = new Set();

  for (let n = node; n; n = n.parentNode) {

    if (seen.has(n) || seen.size > 1000)

      return false;

    seen.add(n);

  return true;

promise_test(async t => {

  const iframe = await parseInIframe(t, SRCDOC);

  const w = iframe.contentWindow;

  assert_true(ancestorChainIsAcyclic(w.fb), "furthest block's ancestor chain is acyclic");

  assert_true(ancestorChainIsAcyclic(w.ca), "common ancestor's ancestor chain is acyclic");

  assert_false(w.fb.contains(w.ca) && w.ca.contains(w.fb),

    "the furthest block and the common ancestor do not contain each other");

  assert_implements_optional(w.handlerRan,

    "pagehide fired synchronously during the adoption agency algorithm");

  assert_equals(w.fb.parentNode, null,

    "furthest block is dropped, not inserted into what became its own descendant");

}, "Adoption agency where pagehide runs script in the middle of the algorithm");

</script>