<!DOCTYPE HTML>  <html>  <head>  <script>  window.onload = function() {  var canvas = document.getElementById("myCanvas");  var context = canvas.getContext("2d");   ////////////////////////////////////// start below this line ˇˇˇˇˇˇˇˇˇˇ  //Simple line   context.beginPath(); // hey im about to draw something  context.lineWidth = 10; // declare the width in pixels of the line  context.moveTo(200,400); // move to starting coordinates  context.lineTo(700,600); // draw line to following point coordinates  context.lineTo(500,200); // draw line to following point coordinates  context.lineTo(300,400); // draw line to following point coordinates  context.lineTo(100,200); // draw line to following point coordinates  context.lineTo(600,300); // draw line to following point coordinates  context.strokeStyle = "rgb(0,256,0)"; // or "#FF0000" // declare the line color in rgb or hexadecimal values  context.stroke();      //RECTANGLE   con...