title: Difference between escape('html') and escape('html_attr') in Twig
body: <p>Since version 1.9.0, <a href="http://twig.sensiolabs.org/">Twig</a> provides the <code>html_attr</code> strategy for the <code>escape</code> filter (see <a href="http://twig.sensiolabs.org/doc/filters/escape.html">documentation</a>).</p>
  
  <p>The <code>html</code> strategy uses the <a href="http://php.net/htmlspecialchars">htmlspecialchars</a> PHP function (this is confirmed by a quick look at the source). The <code>html_attr</code> strategy uses a series of custom substitutions that seem to have the same effect eventually.</p>
  
  <p>Is there a difference between the two strategies?</p>