Set label size in Google Maps API
<p>This code is to set a caption in a label point, but
how to change the font size?</p>

<pre><code>label: {text: marcadores[i][0], color: 'black', TAGFORFONTSIZE: valuesize}
</code></pre>

<p>My code:</p>

<pre><code>&lt;html lang='es'&gt; 
&lt;head&gt; 
    &lt;meta charset='UTF-8'&gt; 
    &lt;style type='text/css'&gt; 
        #mapa { height: 500px; } 
    &lt;/style&gt; 
    &lt;script type='text/javascript' src='http://maps.google.com/maps/api/js?sensor=false'&gt;&lt;/script&gt; 
    &lt;script type='text/javascript'&gt; 
        function initialize() { 
            var marcadores = [ 
                ['usu1', -5.31987835340327, -52.8212431459598],
                ['usu4', 42.3617, -3.6789] 
            ]; 

            var map = new google.maps.Map(document.getElementById('mapa'), { 
                zoom: 7, 
                center: new google.maps.LatLng(41.503, -5.744), 
                mapTypeId: google.maps.MapTypeId.ROADMAP 
            }); 

            var infowindow = new google.maps.InfoWindow(); 
            var marker, i; 

            for (i = 0; i &lt; marcadores.length; i++) {   
                marker = new google.maps.Marker({ 
                    position: new google.maps.LatLng(marcadores[i][1], marcadores[i][2]), 
                    map: map, 
                    label: {text: marcadores[i][0], color: 'black'}
                }); 

                google.maps.event.addListener(marker, 'click', (function(marker, i) { 
                     return function() { 
                         infowindow.setContent(marcadores[i][0]); 
                         infowindow.open(map, marker); 
                     } 
                 })(marker, i)); 
             } 
         } 

         google.maps.event.addDomListener(window, 'load', initialize); 
    &lt;/script&gt; 
&lt;/head&gt; 
&lt;body&gt; 
    &lt;div id='mapa'&gt;&lt;/div&gt; 
&lt;/body&gt; 
&lt;/html&gt; 
</code></pre>