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chromium/third_party/blink/manual_tests/form-element-spelling.html 

<html>
<body>
    <textarea>Helo everibody</textarea><input type="text" value="Helo everibody">
    <p>Test that it's possible to do spell-checking in the two elements above. Choose "Check Spelling" or "Spelling..." from the contextual menu and verify that both work.</p>
</body>
</html>