jQuery textarea append newline behavior

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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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