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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-textarea-element/textarea-placeholder-manual.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: textarea - placeholder attribute</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-textarea-placeholder">
<meta name="flags" content="interact">
<body>
  <p>
    Test passes if there is a "Placeholder Text" in the text area,
    and if the "Placeholder Text" disappears after type in any character.
  </p>
  <textarea placeholder="Placeholder Text"></textarea>
</body>