Strips all formatting from an element

makePlainText.js

function makePlainText (element = document.body) {
  element.innerHTML = element.innerText
    .replace(/\r\n?/g, '\n')              // normalize line-endings to \n
    .replace(/\n/g, '<br>')               // replace linebreaks with <br>
    .replace(/<br>\s+<br>/g, '<br><br>')  // remove gaps between between <br>
    .replace(/(<br>){3,}/g, '<br><br>')   // cap <br> at just 2
}