Old school D3 from simpler times

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ChelseaChenC

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>
    var margin = {
        top: 20,
        right: 80,
        bottom: 30,
        left: 50
      },
      width = 900 - margin.left - margin.right,
      height = 500 - margin.top - margin.bottom;

var svg = d3.select("body").append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
      .append("g");
    
    var mouseG = svg.append("g")
      .attr("class", "mouse-over-effects");
    
    mouseG.append("path") // this is the black vertical line to follow mouse
      .attr("class", "mouse-line")
      .style("stroke", "black")
      .style("stroke-width", "1px")
      .style("opacity", "1");
    
//    var mousePerLine = mouseG.selectAll('.mouse-line')
//       .enter()
//       .append("g")
//       .attr("class", "mouse-per-line");
    
//     mousePerLine.append("circle")
//       .attr("r", 7)
//       .style("fill", "none")
//       .style("stroke-width", "1px")
//       .style("opacity", "1");
    
//     mousePerLine.append("text")
//       .attr("transform", "translate(10,3)");
    
    mouseG.append('svg:rect') // append a rect to catch mouse movements on canvas
      .attr('width', width) // can't catch mouse events on a g element
      .attr('height', height)
      .attr('fill', 'none')
      .attr('pointer-events', 'all')
      .on('mouseout', function() { // on mouse out hide line, circles and text
        d3.select(".mouse-line")
          .style("opacity", "0");
      })
      .on('mouseover', function() { // on mouse in show line, circles and text
        d3.select(".mouse-line")
          .style("opacity", "1");
      })
      .on('mousemove', function() { // mouse moving over canvas
        var mouse = d3.mouse(this);
        d3.select(".mouse-line")
          .attr("d", function() {
            var d = "M" + mouse[0] + "," + height;
            d += " " + mouse[0] + "," + 0;
            return d;
          });  
    })

</script>
</body>

https://d3js.org/d3.v4.min.js