index.js
function unwrap(el) {
  var range = document.createRange()
  range.selectNodeContents(el)
  replaceNode(range.extractContents(), el)
}
function unwrap(el) {
  var range = document.createRange()
  range.selectNodeContents(el)
  replaceNode(range.extractContents(), el)
}
function unwrap ( el ) { var range = document . createRange ( ) range . selectNodeContents ( el ) replaceNode ( range . extractContents ( ) , el ) }
unwrap `el` by replacing itself with its contents
unwrap el by replacing itself with its contents