The antithesis of a feature that encapsulates a chosen area with a span

Hi everyone, I have a function that works as follows:

  define(function () {
  'use strict';
  var sel, range, span;
  return function () {
    span = document.createElement("span");
    span.className = 'highlight';

    if (window.getSelection) {
      sel = window.getSelection();
      if (sel.rangeCount) {
        range = sel.getRangeAt(0).cloneRange();
        range.surroundContents(span);
        sel.removeAllRanges();
        sel.addRange(range);
       }
     }
   };
 });

This function basically wraps my selection with a span. Now, I am looking for a way to reverse this action and remove the span from the selected text. For instance

Let's consider a div:

<div>some text in here</div>

If I were to apply the above function on the word "here" within the div:

<div>some text in <span class="highlight">here</span></div>

I want a method that will eliminate the span element from the highlighted word when it is selected again.

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