&#39 decode

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
   $("#encoded")
  .text(htmlEncode("<img src onerror='alert(0)'>"));
   $("#decoded")
  .text(htmlDecode("<img src onerror='alert(0)'>"));
});
</script>

<span>htmlEncode() result:</span><br/>
<div id="encoded"></div>
<br/>
<span>htmlDecode() result:</span><br/>
<div id="decoded"></div>

function decodeHtml(html) {
    var txt = document.createElement("textarea");
    txt.innerHTML = html;
    return txt.value;
}

The old "how to fold xml" question
Babel doesn't wrap results in verbatim