contenteditable + white-space pre

HTML

<div id="editor">very very very very very very very very very very very very very very very very very very very very very very very very long line

line 3</div>

CSS

#editor {
    border: 1px solid black;
    height: 200px;
    width: 300px;
      white-space: pre;
  word-wrap: normal;
  overflow-x: scroll;
}