IE11: normalize does not merge the splitted text.

[sadikr]

IE11 does not merge the text node correctly, we need to put a work around for this. may be the following one..
Issue: https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/8727426/

function normalize (node) {
  if (!node) { return; }
  if (node.nodeType == 3) {
    while (node.nextSibling && node.nextSibling.nodeType == 3) {
      node.nodeValue += node.nextSibling.nodeValue;
      node.parentNode.removeChild(node.nextSibling);
    }
  } else {
    normalize(node.firstChild);
  }
  normalize(node.nextSibling);
}

[jaberu]

I had the same problem. sadikrs suggestion worked for me.
still looks fine in Chrome and firefox
I created a pull request if you like to apply
#16