MegaBBS supports the following extended markup codes
Opening tagClosing tag
[b][/b]
[i][/i]
[u][/u]
[big][/big]
[small][/small]
[red][/red]
[orange][/orange]
[yellow][/yellow]
[green][/green]
[blue][/blue]
[indigo][/indigo]
[violet][/violet]
[url={param}][/url]
[img={param}]
[email={param}]
[quote][/quote]
[sarc][/sarc]
[youtube]{param}[/youtube]
[vimeo]{param}[/vimeo]