How to add a new element in the context menu of a contenteditable <div>?
I'd like to add an option "Show HTML" that would display the raw HTML that is inside the div.
document.getElementById("a").oncontextmenu = function() { 
  alert("How to add a new element in the Context menu?"); 
}<div id="a" contenteditable="true">Hello you, <strong>right-click</strong> here and see the <a href="#">new option</a> <i>"Show HTML"</i></div>Note: Unlike this question or this one I don't want to override the normal context menu and build a new one, but add a new element to the existing context menu:

 
    