createComment()
creates a new comment node, and returns it.
CommentNode = document.createComment(data)
data
var docu = new DOMParser().parseFromString('<xml></xml>', "application/xml"); var comment = docu.createComment('This is a not-so-secret comment in your document'); docu.getElementsByTagName('xml')[0].appendChild(comment); alert(new XMLSerializer().serializeToString(docu)); // Displays: <xml><!--This is a not-so-secret comment in your document--></xml>
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https://developer.mozilla.org/en-US/docs/Web/API/document/createComment