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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-textarea-element/cloning-steps.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Cloning of textarea elements</title>
<link rel="help" href="https://dom.spec.whatwg.org/#dom-node-clonenode">
<link rel="help" href="https://dom.spec.whatwg.org/#concept-node-clone">
<link rel="help" href="https://dom.spec.whatwg.org/#concept-node-clone-ext">
<link rel="help" href="https://html.spec.whatwg.org/multipage/forms.html#the-textarea-element:concept-node-clone-ext">
<link rel="author" title="Domenic Denicola" href="mailto:[email protected]">

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

<script>
"use strict";

test(function() {
  var textarea = document.createElement("textarea");
  textarea.value = "foo bar";

  var copy = textarea.cloneNode();
  assert_equals(copy.value, "foo bar");
}, "textarea element's value should be cloned");

test(function() {
  var textarea = document.createElement("textarea");
  textarea.value = "foo bar";

  var copy = textarea.cloneNode();
  copy.setAttribute("value", "something else");

  assert_equals(copy.value, "foo bar");
}, "textarea element's dirty value flag should be cloned, so setAttribute doesn't affect the cloned textarea's value");

</script>