title: How to set element attribute using phpunit-selenium
body: <p>I'd like to do something like:</p>
  
  <pre><code>// pseudocode
  $this-&gt;byCssSelector('p')-&gt;setAttribute('attributename', 'attributevalue');
  </code></pre>
  
  <p>How to do that in <a href="https://github.com/giorgiosironi/phpunit-selenium" rel="nofollow">phpunit-selenium</a>?</p>