File: test_datalist_readonly_change.html

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<!DOCTYPE HTML>
<html>

<head>
  <title>Dynamic change to readonly doesn't prevent datalist to keep working</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="/tests/SimpleTest/EventUtils.js"></script>
  <script src="satchel_common.js"></script>
  <link rel="stylesheet" href="/tests/SimpleTest/test.css" />
</head>

<body>
  <input readonly list="suggest" type="text" name="field1">
  <datalist id="suggest">
    <option value="First"></option>
    <option value="Second"></option>
    <option value="Secomundo"></option>
  </datalist>
<script>

add_task(async function readonly() {
  const { input } = await openPopupOn("input", { expectPopup: false });
  ok(input.readOnly, "Input should be readonly");

  input.removeAttribute("readonly");
  await new Promise(resolve => SimpleTest.executeSoon(resolve));
  // AttributeChanged takes control of the input again off a runnable...
  ok(!input.readOnly, "Input should not be readonly");
  is(document.activeElement, input, "Should still be focused");
  await openPopupOn(input);
  assertAutocompleteItems("First", "Second", "Secomundo");
  assertValueAfterKeys(
    input,
    ["KEY_ArrowDown", "KEY_Enter"],
    "First");
});

</script>
</body>

</html>