chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-input-element/email-set-value.html

<!DOCTYPE html>
<title>Input Email setValue</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#e-mail-state-(type=email)">
<link rel="help" href="https://crbug.com/423785">
<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>

<input type="email">

<script>
promise_test(async () => {
  let input = document.querySelector("input");
  let unsanitized = ' foo@bar   ';
  let sanitized = unsanitized.trim();
  await test_driver.send_keys(input, unsanitized);
  input.select();
  assert_equals(input.value, sanitized, "value is sanitized");
  assert_equals(window.getSelection().toString(), unsanitized,
    "visible value is unsanitized");
  input.value = sanitized;
  input.select();
  assert_equals(window.getSelection().toString(), sanitized,
    "visible value is sanitized after setValue(sanitized)");
},
"setValue(sanitizedValue) is reflected in visible text field content");
</script>