If you're a visual learner, one of the biggest instances can be seen at:

http://lambdaplusjs35padjaiz4jw2fugdoeutse262phqr72uf634s2wd...

It's usually SWF. Some features include:

    - No javascript of any type is used anywhere. In fact, CSP is used to block
      execution of any and all javascript, which makes XSS attacks impossible.
    - High security due to the use of pledge() and unveil()
    - Highly transparent moderation logs which include a reason for all
      moderation actions
    - advanced formatting, including LaTeX support
    - anyone can create their own board
    - multiple files per post
    - inline image expansion
    - per-board index and recent pages
    - paginated catalog pages and threads
    - extensive moderation tools