10 - Simple d3.js tooltip

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<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */

body { font: 12px Arial;}

path {
    stroke: steelblue;
    stroke-width: 2;
    fill: none;
}

.axis path,
.axis line {
    fill: none;
    stroke: grey;
    stroke-width: 1;
    shape-rendering: crispEdges;
}

div.tooltip{
    position: absolute;
    text-align: center;
    width: 60px;
    height: 28px;
    padding: 2px;
    font: 12px sans-serif;
    background: DarkOrange;
    border: 0px;
    border-radius: 8px;
    /* pointer-events: none; */
}

</style>
<body>

<script src="https://d3js.org/d3.v3.min.js"></script>

// Set the dimensions of the canvas / graph
    var margin = {top: 30, right: 20, bottom: 30, left: 50},
            width = 600 - margin.left - margin.right,
            height = 270 - margin.top - margin.bottom;

// Parse the date / time
    var parseDate = d3.time.format("%d-%b-%y").parse;
    var formatTime = d3.time.format("%e %B");

// Set the ranges
    var x = d3.time.scale().range([0, width]);
    var y = d3.scale.linear().range([height, 0]);

// Define the axes
    var xAxis = d3.svg.axis().scale(x)
            .orient("bottom").ticks(5);

var yAxis = d3.svg.axis().scale(y)
            .orient("left").ticks(5);

// Define the line
    var valueline = d3.svg.line()
            .x(function(d) { return x(d.date); })
            .y(function(d) { return y(d.close); });

var div = d3.select("body").append("div")
            .attr("class", "tooltip")
            .style("opacity", 0);

// Adds the svg canvas
    var svg = d3.select("body")
            .append("svg")
            .attr("width", width + margin.left + margin.right)
            .attr("height", height + margin.top + margin.bottom)
            .append("g")
            .attr("transform",
                    "translate(" + margin.left + "," + margin.top + ")");

// Get the data
    d3.csv("data.csv", function(error, data) {
        data.forEach(function(d) {
            d.date = parseDate(d.date);
            d.close = +d.close;
        });

// Scale the range of the data
        x.domain(d3.extent(data, function(d) { return d.date; }));
        y.domain([0, d3.max(data, function(d) { return d.close; })]);

// Add the valueline path.
        svg.append("path")
                .attr("class", "line")
                .attr("d", valueline(data));

// Add the scatterplot
        svg.selectAll("dot")
                .data(data)
          .enter().append("circle")
                .attr("r", 5)
                .attr("cx", function(d) { return x(d.date); })
                .attr("cy", function(d) { return y(d.close); })
        				.on("mouseover", function(d) {
          				div.transition()
                  	.duration(500)
                  	.style("opacity", 0);
                  div.transition()
                    .duration(200)
                  	.style("opacity", .9);
          				div .html(
                    '<a href=' + d.link + ' target="_blank">'
                    +formatTime(d.date)
                    + "</a>"
                    + "<br/>"
                    + d.close
                  )
                  	.style("left", (d3.event.pageX) + "px")
                  	.style("top", (d3.event.pageY - 28) + "px");
                })
        				/*
        				.on("mouseout", function(d) {
          				div.transition()
                  	.duration(500)
                  	.style("opacity", 0);
                });
      					*/

// Add the X Axis
        svg.append("g")
                .attr("class", "x axis")
                .attr("transform", "translate(0," + height + ")")
                .call(xAxis);

// Add the Y Axis
        svg.append("g")
                .attr("class", "y axis")
                .call(yAxis);

});

</script>
</body>

Modified http://d3js.org/d3.v3.min.js to a secure url

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