CSVFileReader

fileInput.addEventListener('change', () => {
    content.innerHTML = '';
    fileText.innerHTML = fileInput.value.replace(/^.*[\\\/]/, '');
    const file = fileInput.files[0];
    const reader = new CSVFileReader(file);
                        
    document.querySelector('x-overlay').dispatchEvent(new CustomEvent('show', { detail: { spin: 'true' }}));
                        
    reader.load().then((data) => {
        data.forEach(line => {
            const tr = document.createElement('tr');
            line.forEach(col => {
            const td = document.createElement('td');
            td.textContent = col;
            tr.appendChild(td);
            });
            content.appendChild(tr);
        });
        document.querySelector('x-overlay').dismiss();
    }).catch(err => {
        document.querySelector('x-overlay').stopSpin();
        document.querySelector('x-overlay').setText(`Click to dismiss<br/>${err}`);
    });
});