canvas.html

<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="400" height="400" style="border:1px solid grey"></canvas>
<p id="demo"></p>

<script>
const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");
canvas.height = canvas.width;
ctx.transform(1, 0, 0, -1, 0, canvas.height)

const xArray = [50,60,70,80,90,100,110,120,130,140,150];
const yArray = [7,8,8,9,9,9,10,11,14,14,15];

ctx.fillStyle = "red";
for (let i = 0; i < xArray.length-1; i++) {
  let x = xArray[i]*400/150;
  let y = yArray[i]*400/15;
  ctx.beginPath();
  ctx.ellipse(x, y, 3, 3, 0, 0, Math.PI * 2);
  ctx.fill();
}
document.getElementById("demo").innerHTML = localStorage.getItem("name");
</script>

</body>
</html>