change-to-empty-value.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/forms/the-textarea-element/change-to-empty-value.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>Change event when clearing a textarea</title>

<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">

<link rel="author" href="https://mozilla.org" title="Mozilla">

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1881457">

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

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

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

<script src="/resources/testdriver-actions.js"></script>

<script src="/resources/testdriver-vendor.js"></script>

<textarea>abc</textarea>

<script>

promise_test(async function() {

  let textarea = document.querySelector("textarea");

  let changeFired = false;

  textarea.addEventListener("change", () => {

    changeFired = true;

  }, { once: true });

  textarea.focus();

  assert_equals(document.activeElement, textarea, "Should focus textarea");

  assert_false(changeFired, "Shouldn't have fired change event after focus");

  textarea.select();

  const kBackspaceKey = "\uE003";

  await test_driver.send_keys(textarea, kBackspaceKey)

  assert_false(changeFired, "Shouldn't have fired change event after select");

  textarea.blur();

  assert_true(changeFired, "Should've have fired change event after blur");

  assert_equals(textarea.value, "", "Should've have cleared the value");

});

</script>