<html>
<body>
<h1>HTML5 Canvas - Draw a Shape</h1>
<canvas id="myCanvas" width="200" height="125" style="border:1px solid #000000;">
Sorry, your browser does not support canvas.
</canvas>
<script>
// Create a canvas
const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");
// Define a new path
ctx.beginPath();
// Set start-point
ctx.moveTo(20,20);
// Set sub-points
ctx.lineTo(100,20);
ctx.lineTo(175,100);
ctx.lineTo(20,100);
// Set end-point
ctx.lineTo(20,20);
// Draw it
ctx.stroke();
</script>
</body>
</html>