D3 Examples - Hover map tooltip

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
    .province {
        fill: #000;
        stroke: #fff;
        stroke-width: 1px;
    }
    .province:hover {
        fill: #666;
    }
    .hidden {
        display: none;
    }
    div.tooltip {
        color: #222;
        background-color: #fff;
        padding: .5em;
        text-shadow: #f5f5f5 0 1px 0;
        border-radius: 2px;
        opacity: 0.9;
        position: absolute;
    }
</style>
<body>
    <script src="https://d3js.org/d3.v5.min.js"></script>
    <script src="https://d3js.org/topojson.v1.min.js"></script>
    <script>
        var width = 690,
            height = 580;
        var svg = d3.select('body').append('svg')
            .attr('width', width)
            .attr('height', height);
        var tooltip = d3.select('body').append('div')
                  .attr('class', 'hidden tooltip');
​
        var projection = d3.geoAlbers()
          .center([45.4, 75.5])
          .parallels([45, 70])
          .scale(800)
          .translate([0.65 * width, 0.10 * height]);
​
        var path = d3.geoPath()
              .projection(projection);
​
​
        d3.json('https://raw.githubusercontent.com/codeforamerica/click_that_hood/master/public/data/canada.geojson').then(function(jsondata) {
​
            svg.selectAll('.province')
              .data(jsondata.features)
              .enter().append('path')
                .attr('class', function(d) { 
                                        // chaque forme representant un etat aura 
                                        // deux classes province et un identifiant venant du json
                    return 'province ' + d.properties.cartodb_id;
                })
                .attr('d', path) // on cree la forme de l'etat
                .on('mousemove', function(d) {
                        // on recupere la position de la souris
                    var mousePosition = d3.mouse(this);
                          // on affiche le toolip
                    tooltip.classed('hidden', false)
                          // on positionne le tooltip en fonction 
                            // de la position de la souris
                        .attr('style', 'left:' + (mousePosition[0] + 15) +
                                'px; top:' + (mousePosition[1] - 35) + 'px')
                            // on recupere le nom de l'etat 
                        .html(d.properties.name);
                })
                .on('mouseout', function() {
                          // on cache le toolip
                    tooltip.classed('hidden', true);
                });
        });
    </script>
    </body>
    