Don't let your headers dangle!

noDangle.js

/**
 * Don't let your headers dangle!
 *
 * My super cool blog
 * thing               <<<< dangling!
 */
function noDangle(selector, minWords) {
  selector = selector || 'h1,h2,h3,h4,h5,h6'
  minWords = minWords || 1

  var undangle = function(text, minWords) {
    minWords = minWords || 1
    var parts = text.split(/\s/)
    if (parts.length < 2) return text
    return parts.slice(0, parts.length - minWords).join(' ') + '&nbsp;' + parts.slice(parts.length - minWords).join('&nbsp;')
  }

  Array().forEach.call(document.querySelectorAll(selector), function(el) {
    while (el.children.length) {
      el = el.children[el.children.length - 1]
    }

    var text = el.innerText
    var replacement = undangle(text, minWords)
    el.innerHTML = replacement
  })
}