Link: Really Simple Live Comment Preview

You can use jQuery to show a live preview of comments before you post them (so you can see how they will display when you submit) and it is very simple to do. You can find more details on the Learning jQuery site: Really Simple Live Comment Preview. You can see how it works by filling in the comments form at the bottom of the aforementioned post. It could be improved if the live preview was styled like it would be if you posted the message (with your name and date before the comment), rather than just showing the comment and possibly malicious tags (script, object) not interpreted.

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