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

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTMLTextAreaElement Test: select()</title>
<link rel="author" title="Intel" href="http://www.intel.com/">
<meta name="flags" content="interact">

<p>Test passes if content of the input area is selected</p>

<textarea id="test_obj">1234567</textarea>
<script>
var textarea = document.querySelector("#test_obj");
textarea.select();
</script>