place caret at end of contenteditable element

placeCaretAtEnd.js

function placeCaretAtEnd(el) {
  el.focus()
  if (typeof window.getSelection != "undefined"
    && typeof document.createRange != "undefined") {
    const range = document.createRange()
    range.selectNodeContents(el)
    range.collapse(false)
    const sel = window.getSelection()
    sel.removeAllRanges()
    sel.addRange(range)
  } else if (typeof document.body.createTextRange != "undefined") {
    const textRange = document.body.createTextRange()
    textRange.moveToElementText(el)
    textRange.collapse(false)
    textRange.select()
  }
}