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

<!doctype html>
<meta charset="utf-8">
<title>Input type switch from / to color</title>
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://html.spec.whatwg.org/#input-type-change">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1833477">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
function runTest(focus) {
  let input = document.createElement("input");
  input.type = "color";
  document.body.appendChild(input);
  if (focus) {
    input.focus();
  }
  assert_equals(input.value, "#000000", "Invalid color should return a non-empty sanitized value");
  input.type = "text";
  assert_equals(input.value, "", "Value dirty flag should remain false");
  input.type = "color";
  input.value = "#ffffff";
  assert_equals(input.value, "#ffffff", "Valid color is returned");
  input.type = "text";
  assert_equals(input.value, "#ffffff", "Value dirty flag should remain true");
  if (focus) {
    assert_equals(document.activeElement, input, "Focus is preserved");
  }
}
test(() => runTest(false), "Without focus");
test(() => runTest(true), "With focus");
</script>