test_bug2068351.html

Enable keyboard shortcuts

<!DOCTYPE html>

<html>

<head>

  <title>Test for Bug 2068351</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" href="/tests/SimpleTest/test.css">

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=2068351">Mozilla Bug 2068351</a>

<div id="content"></div>

<script>

/**

 * Setting an attribute on a form control whose form owner has been set by the

 * parser, but which is not registered with that form yet, must not add the

 * control to the form's control list.

*/

SimpleTest.waitForExplicitFinish();

SimpleTest.requestLongerTimeout(2);

const doc = `<!DOCTYPE html>

<html><body>

<script>

var stash = [];

var hits = [];

customElements.define("x-in", class extends HTMLInputElement {

  constructor() {

    super();

    stash.push(this);

    var t = performance.now();

    while (performance.now() - t < 0.2) {}

}, { extends: "input" });

var mc = new MessageChannel();

var done = false;

mc.port1.onmessage = function() {

  var el = stash.length ? stash[stash.length - 1] : null;

  if (el && el.form && !el.parentNode && hits.indexOf(el) < 0) {

    el.setAttribute("type", "checkbox");

    hits.push(el);

  if (!done) {

    mc.port2.postMessage(0);

};

mc.port2.postMessage(0);

window.addEventListener("load", () => { done = true; });

<\/script>

<form id="f"><input id="c1">` +

  "<input is=x-in><!----><!----><!---->".repeat(10000) +

  `</form></body></html>`;

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

iframe.src = URL.createObjectURL(new Blob([doc], { type: "text/html" }));

iframe.onload = () => {

  const win = iframe.contentWindow;

  const form = win.document.getElementById("f");

  const seen = new Set();

  let duplicates = 0;

  for (let i = 0; i < form.elements.length; i++) {

    if (seen.has(form.elements[i])) {

      duplicates++;

    seen.add(form.elements[i]);

  info(`Mutated ${win.hits.length} control(s) before they were appended`);

  is(duplicates, 0, "No control is registered with the form twice");

  is(form.elements.length, 10001, "Every control is registered exactly once");

  SimpleTest.finish();

};

document.getElementById("content").appendChild(iframe);

</script>

</body>

</html>