form-control-state.html

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This WPT test may be referenced by the following Test IDs:
- /html/webappapis/dynamic-markup-insertion/opening-the-input-stream/form-control-state.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

<title>Writing out a document with form controls with values</title>

<link rel="author" href="mailto:bzbarsky@mit.edu"/>

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

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

</head>

<body>

<div id="log"></div>

<script>

function asyncHop(t, arg) {

  return new Promise(res => t.step_timeout(res.bind(null, arg), 0));

function loadPromise(t, iframe) {

  var p = new Promise(res =>

    iframe.addEventListener("load", res.bind(null, iframe), { once: true }));

  // We need to do one trip through the event loop to make sure we're

  // not still under the load event firing when we start doing our

  // document.open bits.

  return p.then(asyncHop.bind(null, t));

async function createIframe(t) {

  var i = document.createElement("iframe");

  t.add_cleanup(() => i.remove());

  var p = loadPromise(t, i);

  document.body.appendChild(i);

  return p;

async function replaceIframe(t, i, text) {

  var p = loadPromise(t, i);

  var doc = i.contentDocument;

  doc.open();

  doc.write(text);

  doc.close();

  return p;

promise_test(async function(t) {

  var i = await createIframe(t);

  var str = "<textarea>123</textarea>";

  await replaceIframe(t, i, str);

  i.contentDocument.querySelector("textarea").value = "abc";

  await replaceIframe(t, i, str);

  assert_equals(i.contentDocument.querySelector("textarea").value, "123");

}, "textarea state");

promise_test(async function(t) {

  var i = await createIframe(t);

  var str = "<input value='123'>";

  await replaceIframe(t, i, str);

  i.contentDocument.querySelector("input").value = "abc";

  await replaceIframe(t, i, str);

  assert_equals(i.contentDocument.querySelector("input").value, "123");

}, "input state");

</script>

</body>

</html>