Hover Markers

<!DOCTYPE html>
<html>
  <head>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/gh/simplegeo/polymaps/v2.3.0/polymaps.min.js"></script>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/gh/simplegeo/polymaps/v2.3.0/lib/crimespotting/crimespotting.js"></script>
    <style type="text/css">

@import url("https://cdn.rawgit.com/simplegeo/polymaps/v2.3.0/examples/example.css");

html, body {
  height: 100%;
  background: #E6E6E6;
}

svg {
  display: block;
}

.datapoint {
  fill: lightsteelblue;
  fill-opacity: .5;
  stroke: steelblue;
}

.datapoint:hover {
  fill: lightcoral;
  stroke: brown;
}

</style>
  </head>
  <body>
    <script type="text/javascript">

var po = org.polymaps;

var map = po.map()
    .container(document.body.appendChild(po.svg("svg")))
    .center({lat: 37.787, lon: -122.228})
    .zoomRange([10, 16])
    .add(po.interact());

map.add(po.image()
    .url(po.url("https://{S}tile.cloudmade.com"
    + "/1a1b06b230af4efdbb989ea99e9841af" // https://cloudmade.com/register
    + "/998/256/{Z}/{X}/{Y}.png")
    .hosts(["a.", "b.", "c.", ""])));

map.add(geoJson = po.geoJson()
    .url(crimespotting("https://oakland.crimespotting.org"
        + "/crime-data"
        + "?count=100"
        + "&format=json"
        + "&bbox={B}"
        + "&dstart=2010-04-01"
        + "&dend=2010-04-01"))
    .clip(false)
    .scale("fixed")
    .on("load", load)
    .zoom(12));

function load(e) {
  for (var i = 0; i < e.features.length; i++) {
    var c = e.features[i].element;
    c.setAttribute("class", "datapoint");
    c.setAttribute("r", 12);
  }
}

</script>
    <span id="copy">
      &copy; 2010
      <a href="https://www.cloudmade.com/">CloudMade</a>,
      <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors,
      <a href="https://creativecommons.org/licenses/by-sa/2.0/">CCBYSA</a>.
    </span>
  </body>
</html>

Updated missing url https://cdn.rawgit.com/simplegeo/polymaps/v2.3.0/polymaps.min.js to https://cdn.jsdelivr.net/gh/simplegeo/polymaps/v2.3.0/polymaps.min.js

Updated missing url https://cdn.rawgit.com/simplegeo/polymaps/v2.3.0/lib/crimespotting/crimespotting.js to https://cdn.jsdelivr.net/gh/simplegeo/polymaps/v2.3.0/lib/crimespotting/crimespotting.js

https://cdn.rawgit.com/simplegeo/polymaps/v2.3.0/polymaps.min.js

https://cdn.rawgit.com/simplegeo/polymaps/v2.3.0/lib/crimespotting/crimespotting.js