jQuery textarea append newline behavior

Not sure how you are setting the textarea content, but if you use the jQuery val method, \n works consistently in Firefox and IE (Including IE8):

var txt = $("textarea#idhere");
txt.val( txt.val() + "\nSomething here\n\nAgain");

Causes the textarea to display:

Existing content
and linebreaks if any.
Something here

Again

You can see a demo here that works in FF and IE8: Demo | Source

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