CSS rgba() colors are incorrectly parsed

[EatChangmyeong]

Issue or Feature

Colors in three-argument rgba(R, G, B) notation are parsed as fully transparent colors, instead of being fully opaque. This issue does not show up in four-argument rgba(R, G, B, A) or rgb(R, G, B) without a.

Steps to Reproduce

var Canvas = require('canvas');
var canvas = Canvas.createCanvas(200, 200);
var ctx = canvas.getContext('2d');
ctx.fillStyle = 'rgba(255, 255, 255)';
console.log(ctx.fillStyle); // rgba(255, 255, 255, 0.00)

Your Environment

• Version of node-canvas (output of npm list canvas or yarn list canvas): 2.9.1
• Environment (e.g. node 4.2.0 on Mac OS X 10.8): node 16.14.2