JSFiddle - React, Tailwind, and code Playground

by Mo Qiao

HTML

<canvas id="canvas">当前浏览器不支持Canvas，请更换浏览器后再试</canvas>

CSS

#canvas {
    width: 100%;
    height: auto;
}

JavaScript

var canvas = document.getElementById('canvas');
	var ctx = canvas.getContext('2d');
	ctx.fillStyle = 'rgba(0,0,0,0.8)'
	ctx.strokeRect(50, 50, 55, 50);