title: google maps v3 standard icon/shadow names (equiv. of G_DEFAULT_ICON in v2)
body: <p>I'm switching icon types of google maps markers between a default one and another one (made by google chart api). To switch back to standard icon I use:</p>
  
  <pre><code>marker.setIcon('http://maps.google.com/mapfiles/marker.png');
  </code></pre>
  
  <p>For another icon I use:</p>
  
  <pre><code>marker.setIcon('http://maps.google.com/mapfiles/marker_yellow.png');
  </code></pre>
  
  <p><strong>The question is:</strong></p>
  
  <ol>
  <li><p>is the URL I use really the "standard" (canonical)? Is it assured that google will not change it?</p></li>
  <li><p>it would be better to use some constant like <code>G_DEFAULT_ICON</code> in gmaps api v2. Is there anything similar in api v3?</p></li>
  <li><p>if not, where one can find the list of canonical icon/shadow URLs that are assured to work during all the google api v3 life?</p></li>
  </ol>
  
  <p>The same question for shadows - when I set the icon, how to get the standard shadow instead of using ugly <code>m.setShadow(new google.maps.MarkerImage('http://maps.gstatic.com/mapfiles/shadow50.png', null, null, new google.maps.Point(10, 34)))</code>? (Note that <code>getShadow()</code> will not tell you anything as it returns <code>null</code> on the default icon with defaultshadow).</p>
  
  <p><hr>
  PS: there are some dynamic icons APIs but they all are now deprecated, <a href="https://stackoverflow.com/q/11318672/684229">and no remedy has been found</a>.</p>