JSFiddle - React, Tailwind, and code Playground

HTML

<canvas id="canvas" width="540" height="540"></canvas>

JavaScript

function loadImages(sources, callback) {
        var images = {};
        var loadedImages = 0;
        var numImages = 0;
        // get num of sources
        for(var src in sources) {
          numImages++;
        }
        for(var src in sources) {
          images[src] = new Image();
          images[src].onload = function() {
            if(++loadedImages >= numImages) {
              callback(images);
            }
          };
          images[src].src = sources[src];
        }
      }
      var canvas = document.getElementById('canvas');
      var context = canvas.getContext('2d');

      var sources = {
        img1: 'https://scontent-iad3-1.cdninstagram.com/hphotos-xaf1/t51.2885-15/11351598_1454928098145798_1274636321_n.jpg',
        img2: 'https://igcdn-photos-c-a.akamaihd.net/hphotos-ak-xaf1/t51.2885-15/11379733_1139595366067106_273993739_n.jpg',
        mask: 'http://img12.deviantart.net/65e4/i/2013/003/6/6/png_floating_terrain_by_moonglowlilly-d5qb58m.png'
      };

      loadImages(sources, function(images) {
        context.drawImage(images.img2, 0, 0, 240, 240);
        
        context.drawImage(images.mask, 20, 95, 500, 349);
        context.globalCompositeOperation = 'source-in';
        context.drawImage(images.img1, 0, 0, 540, 540);

      });