JSFiddle - React, Tailwind, and code Playground

HTML

<canvas id="canvas1" width="400" height="400" style="border: 1px solid black;"></canvas>

JavaScript

// 1.
// Varying line width, stroking each piece of line separately
var ctx = document.getElementById('canvas1').getContext('2d');
var points = [null, null, null, null];

for(var i=-1; i<25; i = i +1)
{
    var width = 0.5 + i/2;
    
    var m = 200;
    
    
    var x = Math.cos(i/4) * 180;
    var y = Math.sin(i/4) * 140;
    
    points[0] = points[1];
    points[1] = points[2];
    points[2] = { X:x, Y:y};
    
    if(points[0] == null)
        continue;
    
    
    var p0 = points[0];
    var p1 = points[1];
    var p2 = points[2];

    var x0 = (p0.X + p1.X) / 2;
    var y0 = (p0.Y + p1.Y) / 2;

    var x1 = (p1.X + p2.X) / 2;
    var y1 = (p1.Y + p2.Y) / 2;
    
    ctx.beginPath();
    ctx.lineWidth = width;
    ctx.strokeStyle = "black";
    
    ctx.moveTo(m+x0, m+y0);
    ctx.quadraticCurveTo(m+p1.X, m+p1.Y, m+x1, m+y1);
    ctx.stroke();
}