main.js

//image functions
function loadImageText(cb) {
    
    let xhttp = new XMLHttpRequest();

    xhttp.onreadystatechange = function() {

        if (xhttp.readyState === 4 && xhttp.status === 200) {

            cb(xhttp.response.split('\n'));

        } else if (xhttp.status !== 0 && xhttp.status !== 200)
            console.error(xhttp.response, xhttp.status);
    };

    xhttp.open('GET', `./images/images.txt`, true);

    xhttp.send();
}

function toDataURL(url, callback) {
    var xhr = new XMLHttpRequest();
    xhr.onload = function() {
        var reader = new FileReader();
        reader.onloadend = function() {
            callback(reader.result);
        }
        reader.readAsDataURL(xhr.response);
    };
    xhr.open('GET', url);
    xhr.responseType = 'blob';
    xhr.send();
}

addEventListener('load', () => {
    
    /* Asynchronously load the following */
    
    //images
    loadImageText(images => {
        
        //main image
        toDataURL('./images/'+images[0], b64 => {
            let img = document.createElement('img');
            img.setAttribute('src', b64);
            document.getElementById('imageContainer').appendChild(img);
            setTimeout(() => document.getElementById('imageContainer').classList.add('loaded'), 10);
        });
        
        //background
        toDataURL('./images/'+images[1], b64 => {
            let img = document.createElement('img');
            img.setAttribute('src', b64);
            document.getElementById('backgroundContainer').appendChild(img);
            setTimeout(() => document.getElementById('backgroundContainer').classList.add('loaded'), 10);
        });
        
    });
    
});

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