Creating a downloadable text-file using blobs

Created as part of my answer to http://stackoverflow.com/questions/8178825/create-text-file-in-javascript

HTML

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<form>
<input type='text' class='form_campos form_campos_nome' id='auto' name='verifica_nome3'>
<input type="text" placeholder="Se o cursor estiver aqui pode submeter form">
<input type="submit">
</form>

JavaScript

$('#auto').keypress(function(e) {
		if(e.which == 13) {
      e.preventDefault();
      console.log('Não vou enviar');
    }
});