JSFiddle - React, Tailwind, and code Playground

HTML

<canvas id="myCanvas" width="20" height="20"></canvas>

JavaScript

var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');

context.beginPath();
context.moveTo(10, 0);
context.lineTo(20, 20);
context.lineTo(0, 20);
context.closePath();
context.fill();