When content is empty, caret disappear in contenteditable

Question

When div[contenteditable] to empty(like $(this).html("")) then caret disappeared.

Is it bug? Also I found some other solution. using setTimeout function. but It's not perfect solution for me. when I use many contenteditables division moving focus with tab key. then that solution is not working properly.

When I tested on Ubuntu 12.04,

in Firefox 20.0 Click event : caret disappeared,

in Chrome 25.0 Focusin event : caret disappeared.

$(function() {
  $("#alpha").on("click", function(e) {
    console.log("click");
    $(this).children().html("");
  });
  $("#beta").on("focusin", function(e) {  
    console.log("focusin");
    $(this).html("");
  });     
});

You can test it my fiddle Click yellow area, or other area.