The end user looking at a chessboard on a www.remarpro.com site can flip the board clicking the E7 square or pressing the “f” key while the chessboard is in focus.
There’s no provision in the plugin to post a chessboard flipped with Black on bottom at startup. While it would not require a lot of effort to implement this option, this feature is not available nor planned: printed chessboard in my opinion should always have White on bottom, leaving the option open would only generate confusion, for example in ending positions with just few pieces/pawns.
If you are strongly interested in implementing the feature for your own use, feel free to contact the pgn4web project at pgn4web(at)casaschi.net
