saving text in javascript
const downloadToFile = (content, filename, contentType) => {
const a = document.createElement('a');
const file = new Blob([content], {type: contentType});
a.href= URL.createObjectURL(file);
a.download = filename;
a.click();
URL.revokeObjectURL(a.href);
};
document.querySelector('#btnSave').addEventListener('click', () => {
const textArea = document.querySelector('textarea');
downloadToFile(textArea.value, 'my-new-file.txt', 'text/plain');
});