map_erase_sf // sami rubenfeld

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  margin: 0;
}

path {
  fill: none;
  stroke: #FEFAEC;
  stroke-linejoin: round;
  stroke-linecap: round;
}

#neighborhoodPopover {
  position: absolute;
  text-align: center;
  padding: 2px;
  font-family: futura;
  font-size: 12px;
  background: #fff;
  border: 0px;
  border-radius: 8px;
  pointer-events: none;
  opacity: 0;
}

.major_road { stroke: #00B8A9; }
.minor_road { stroke: #FFDE7D; }
.highway { stroke: #FFC057; stroke-width: 1.5px; }
.rail { stroke: #F8F3D4; }

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="d3.geo.tile.min.js"></script>
<script>

var width = Math.max(960, window.innerWidth),
    height = Math.max(500, window.innerHeight);

var tiler = d3.geo.tile()
    .size([width, height]);

var projection = d3.geo.mercator()
    .center([-122.4183, 37.7750])
    .scale((1 << 21) / 2 / Math.PI)
    .translate([width / 2, height / 2]);

var path = d3.geo.path()
    .projection(projection);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

svg.selectAll("g")
    .data(tiler
      .scale(projection.scale() * 2 * Math.PI)
      .translate(projection([0, 0])))
  .enter().append("g")
    .each(function(d) {
      var g = d3.select(this);
      d3.json("https://vector.mapzen.com/osm/roads/" + d[2] + "/" + d[0] + "/" + d[1] + ".json?api_key=vector-tiles-LM25tq4", function(error, json) {
        if (error) throw error;

g.selectAll("path")
          .data(json.features.sort(function(a, b) { return a.properties.sort_key - b.properties.sort_key; }))
        .enter().append("path")
          .attr("class", function(d) { return d.properties.kind; })
          .attr("d", path)
          .on("mouseenter", function(d) {
            console.log(d);
          d3.select(this)
          .style("stroke-width", 1.5)
          .style("stroke-dasharray", 0)

d3.select("#neighborhoodPopover")
          .transition()
          .style("opacity", 1)
          .style("left", (d3.event.pageX) + "px")
          .style("top", (d3.event.pageY) + "px")
          .text(rateById.get(d.id))

})
        .on("mouseleave", function(d) {
          d3.select(this)
          .style("stroke-width", .25)
          .style("stroke-dasharray", 1)

d3.select("#neighborhoodPopovercountyText")
          .transition()
          .style("opacity", 0);
        });
      });
    });

</script>

https://d3js.org/d3.v3.min.js