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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <!-- For now, the test suite only works in Chrome! -->
            
          
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              @import url(https://fonts.googleapis.com/css?family=Open+Sans)

body
  font-family: 'Open Sans', sans-serif
  font-weight: 400
  color: black
  .d3-tip
    background-color: rgba(0,0,0,0.8)
    border-radius: 6px
    color: white
    text-align: center
    padding: 0.5em
    .date .temperature
    .variance

section
  width: auto
  overflow: visible
  margin-left: auto
  margin-right: auto
  font-size: 16px
  heading
    text-align: center
  svg
    stroke-width: 1
    stroke: black
  .y-axis, .x-axis, .legend
    text
      stroke-width: 0
  .map
    stroke-width: 0
    rect:hover
      stroke-width: 2
    

            
          
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              // coded by @paycoguy & @ChristianPaul (github)
const projectName = 'heat-map';
localStorage.setItem('example_project', 'Heat Map');

var url = "https://raw.githubusercontent.com/FreeCodeCamp/ProjectReferenceData/master/global-temperature.json";

//colors from colorbrewer
//http://colorbrewer2.org/

var colorbrewer = {
  RdYlBu: {
    3: ["#fc8d59","#ffffbf","#91bfdb"],
    4: ["#d7191c","#fdae61","#abd9e9","#2c7bb6"],
    5: ["#d7191c","#fdae61","#ffffbf","#abd9e9","#2c7bb6"],
    6: ["#d73027","#fc8d59","#fee090","#e0f3f8","#91bfdb","#4575b4"],
    7: ["#d73027","#fc8d59","#fee090","#ffffbf","#e0f3f8","#91bfdb","#4575b4"],
    8: ["#d73027","#f46d43","#fdae61","#fee090","#e0f3f8","#abd9e9","#74add1","#4575b4"],
    9: ["#d73027","#f46d43","#fdae61","#fee090","#ffffbf","#e0f3f8","#abd9e9","#74add1","#4575b4"],
    10: ["#a50026","#d73027","#f46d43","#fdae61","#fee090","#e0f3f8","#abd9e9","#74add1","#4575b4","#313695"],
    11: ["#a50026","#d73027","#f46d43","#fdae61","#fee090","#ffffbf","#e0f3f8","#abd9e9","#74add1","#4575b4","#313695"]
  },
  RdBu: {
    3: ["#ef8a62","#f7f7f7","#67a9cf"],
    4: ["#ca0020","#f4a582","#92c5de","#0571b0"],
    5: ["#ca0020","#f4a582","#f7f7f7","#92c5de","#0571b0"],
    6: ["#b2182b","#ef8a62","#fddbc7","#d1e5f0","#67a9cf","#2166ac"],
    7: ["#b2182b","#ef8a62","#fddbc7","#f7f7f7","#d1e5f0","#67a9cf","#2166ac"],
    8: ["#b2182b","#d6604d","#f4a582","#fddbc7","#d1e5f0","#92c5de","#4393c3","#2166ac"],
    9: ["#b2182b","#d6604d","#f4a582","#fddbc7","#f7f7f7","#d1e5f0","#92c5de","#4393c3","#2166ac"],
    10: ["#67001f","#b2182b","#d6604d","#f4a582","#fddbc7","#d1e5f0","#92c5de","#4393c3","#2166ac","#053061"],
    11: ["#67001f","#b2182b","#d6604d","#f4a582","#fddbc7","#f7f7f7","#d1e5f0","#92c5de","#4393c3","#2166ac","#053061"]
  }
};


d3.json(url, callback);

function callback(error, data){
  console.log("data: ", data);
  
  if(!error){
    data.monthlyVariance.forEach(function(val){
      val.month -= 1;
    });
    
    var section = d3.select("body")
        .append("section");
    
    //heading
    var heading = section.append("heading");
    heading.append("h1")
      .attr('id', 'title')
      .text("Monthly Global Land-Surface Temperature");
    heading.append("h3")
      .attr('id', 'description')
      .html(data.monthlyVariance[0].year + " - " + data.monthlyVariance[data.monthlyVariance.length-1].year + ": base temperature " + data.baseTemperature + "&#8451;");
    
    var fontSize = 16;
    var width = 5*Math.ceil(data.monthlyVariance.length/12); //1500;
    var height = 33*12; //400;
    var padding = {left: 9*fontSize, right: 9*fontSize, top: 1*fontSize, bottom:8*fontSize};
    var tip = d3.tip()
        .attr("class", "d3-tip")
        .attr("id", "tooltip")
        .html(function(d){
          return d;
        })
        .direction("n")
        .offset([-10,0]);
    
    var svg = section.append("svg")
        .attr({
          width: width + padding.left + padding.right,
          height: height + padding.top + padding.bottom
        })
        .call(tip);
    
    //yaxis
    var yScale = d3.scale.ordinal()
      .domain([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]) //months
      .rangeRoundBands([0, height], 0, 0);
    var yAxis = d3.svg.axis()
      .scale(yScale)
      .tickValues(yScale.domain())
      .tickFormat(function(month){
        var date = new Date(0);
        date.setUTCMonth(month);
        return d3.time.format.utc("%B")(date);
      })
      .orient("left")
      .tickSize(10, 1);
    
    svg.append("g")
        .classed("y-axis", true)
        .attr("id", "y-axis")
        .attr("transform", "translate(" + padding.left + "," + padding.top + ")")
        .call(yAxis)
      .append("text")
        .text("Months")
        .style("text-anchor", "middle")
        .attr("transform", "translate(" + (-7*fontSize) + "," + (height/2) + ")" + "rotate(-90)");
    
    //xaxis
    
    //ordinal scale
    var xScale = d3.scale.ordinal()
      .domain(data.monthlyVariance.map(function(val){return val.year}))
      .rangeRoundBands([0, width], 0, 0);
    var xAxis = d3.svg.axis()
        .scale(xScale)
        .tickValues(xScale.domain().filter(function(year){
          //set ticks to years divisible by 10
          return year%10 === 0;
        }))
        .tickFormat(function(year){
          var date = new Date(0);
          date.setUTCFullYear(year)
          return d3.time.format.utc("%Y")(date);
        })
        .orient("bottom")
        .tickSize(10, 1);
    
    svg.append("g")
        .classed("x-axis", true)
        .attr("id", "x-axis")
        .attr("transform", "translate(" + padding.left + "," + (height + padding.top) + ")")
        .call(xAxis)
        .append("text")
        .text("Years")
        .style("text-anchor", "middle")
        .attr("transform", "translate(" + (width/2) + "," + (3*fontSize) + ")");
    
    //legend
    //Follow example from https://bl.ocks.org/mbostock/4573883 to draw the legend
    
    var legendColors = colorbrewer.RdYlBu[11].reverse();
    var legendWidth = 400;
    var legendHeight = 300/legendColors.length;
    
    var variance = data.monthlyVariance.map(function(val){
      return val.variance;
    });
    var minTemp = data.baseTemperature + Math.min.apply(null, variance);
    var maxTemp = data.baseTemperature + Math.max.apply(null, variance);
    
    var legendThreshold = d3.scale.threshold()
        .domain((function(min,max,count){
          var array = [];
          var step = (max-min)/count;
          var base = min;
          for(var i = 1; i < count; i++){
            array.push(base + i*step);
          }
          return array;
        })(minTemp, maxTemp,legendColors.length))
        .range(legendColors);
    
    var legendX = d3.scale.linear()
        .domain([minTemp, maxTemp])
        .range([0, legendWidth]);
    
    var legendXAxis = d3.svg.axis()
        .scale(legendX)
        .orient("bottom")
        .tickSize(10, 0)
        .tickValues(legendThreshold.domain())
        .tickFormat(d3.format(".1f"));
    
    var legend = svg.append("g")
        .classed("legend", true)
        .attr("id", "legend")
        .attr("transform", "translate(" + (padding.left) + "," + (padding.top + height + padding.bottom - 2*legendHeight) + ")");
    
    legend.append("g")
      .selectAll("rect")
        .data(legendThreshold.range().map(function(color){
          var d = legendThreshold.invertExtent(color);
          if(d[0] == null) d[0] = legendX.domain()[0];
          if(d[1] == null) d[1] = legendX.domain()[1];
          return d;
        }))
      .enter().append("rect")
        .style("fill", function(d, i){return legendThreshold(d[0])})
        .attr({
          x: function(d,i){return legendX(d[0])},
          y: 0,
          width: function(d,i){return legendX(d[1]) - legendX(d[0])},
          height: legendHeight
        });
    
    legend.append("g")
        .attr("transform", "translate(" + 0 + "," + legendHeight + ")")
        .call(legendXAxis);
    
    //map
    svg.append("g")
        .classed("map", true)
        .attr("transform", "translate(" + padding.left + "," + padding.top + ")")
      .selectAll("rect")
        .data(data.monthlyVariance)
      .enter().append("rect")
      .attr('class', 'cell')
      .attr('data-month',function(d){
        return d.month;
      })
      .attr('data-year',function(d){
        return d.year;
      })
      .attr('data-temp',function(d){
        return data.baseTemperature + d.variance;
      })
      .attr({
        x: function(d,i){
          return xScale(d.year);
        },
        y: function(d,i){
          return yScale(d.month);
        },
        width: function(d,i){
          return xScale.rangeBand(d.year);
        },
        height: function(d,i){
          return yScale.rangeBand(d.month);
        }
    })
    .attr("fill", function(d,i){
      return legendThreshold(data.baseTemperature + d.variance);
     })
    .on("mouseover", function(d){
      var date = new Date(d.year, d.month);
      var str = "<span class='date'>" + d3.time.format("%Y - %B")(date) + "</span>" + "<br />"
              + "<span class='temperature'>" + d3.format(".1f")(data.baseTemperature + d.variance) + "&#8451;" + "</span>" + "<br />"
              + "<span class='variance'>" + d3.format("+.1f")(d.variance) + "&#8451;" + "</span>";
      tip.attr("data-year", d.year);
      tip.show(str);
    })
    .on("mouseout", tip.hide);
    
  } else{
    console.log("Error loading data from server.");
  }
}

            
          
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