w3schools html canvas code example

Example 1: javascript canvas

#this code creates a circle within a canvas that must be created in HTML
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.beginPath();
ctx.arc(95, 50, 40, 0, 2 * Math.PI);
ctx.stroke();

Example 2: canvas tag html

//HTML
<canvas id="canv"></canvas>

//Javascript
var canvas = document.getElementById("canv");
canvas.width = canvas.height = 100;
var ctx = canvas.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(10, 10, 80, 80);

Example 3: html css canvas

<canvas id="myCanvas" width="200" height="100" style="border:1px solid #000000;">
</canvas>