Thanks Martin! Will fix.
Prievew Post
Confirmed on Chrome. For me actually the preview persisted when I closed the page and came back, and after refreshing I could still press "Submit" so that the box disappeared.
I don't know if the "preview" was actually posted to the page (and became immediately visible by others), but it was persistent after page refresh. This is a bit different from what most message boards like SMF or PHPBB do.
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On Firefox (8.0 and Aurora 10.0a2) the preview post function acutally posts to the page:
http://www.chess.com/groups/forumview/numbered-lists