Copy all styles from one element to another

If you don’t care about IE, then you can do this:

var p = document.getElementById("your_p_id");
var div = document.createElement("div");
div.innerHTML = "your div content";
div.style.cssText = document.defaultView.getComputedStyle(p, "").cssText;

#your_p_id {
  color: #123124;
  background-color: #decbda;
}

<textArea id="your_p_id">Hello world!</textArea>

This works for inline, embedded, and inherited styles.

EDIT: And by “don’t care about IE,” I of course meant “don’t care about anything except Webkit.”

UPDATE: This works in the current versions of Chrome(19), Safari(5), Firefox(12), and IE(9). It also works in older versions of some, such as IE8.