Transparent

const config = {
    type: Phaser.AUTO,
    parent: 'phaser-example',
    width: 800,
    height: 600,
    transparent: true,
    scene: {
        preload: preload,
        create: create
    }
};

const game = new Phaser.Game(config);

function preload ()
{
        this.load.setBaseURL('https://cdn.phaserfiles.com/v355');
    this.load.image('pic', 'assets/pics/forgotten-worlds.png');
}

function create ()
{
    //  This just injects an image into the div background, so you can see the transparency working.
    var div = document.getElementById('phaser-example');

    div.style.background = 'url(assets/demoscene/multi-color-raster.png)';

    this.add.image(400, 600, 'pic').setOrigin(0.5, 1);
}
                        

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