File: selection-after-whitespace-change.html

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<!DOCTYPE html>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<textarea id="t" style="white-space: nowrap">Hello</textarea>
<script>
promise_test(async () => {
  t.focus();
  if (navigator.userAgent.includes("Mac")) {
    // Meta+ArrowLeft
    await new test_driver.Actions()
      .keyDown("\uE03D")
      .keyDown("\uE058")
      .keyUp("\uE058")
      .keyUp("\uE03D")
      .send();
  } else {
    // Home
    await test_driver.send_keys(t, ["\uE011"]);
  }
  // And then Delete
  await test_driver.send_keys(t, ["\uE017"]);
  t.style.whiteSpace = "pre-line";
  await new Promise(setTimeout);
  assert_equals(t.selectionStart, 0, "selectionStart should remain 0");
  assert_equals(t.selectionEnd, 0, "selectionEnd should remain 0");
}, "Changing white-space should not change selection");
</script>