Great tutorial on how to use the new Viewport Alignment tool introduced in Blend4Web 15.12 by Luke Martin aka LukeVideo.
https://www.youtube.com/watch?v=N-ByVjv9Edo

Don't miss other nice tutorials!

Blend4Web simple interaction
https://www.youtube.com/watch?v=6yRRPl8Qsgk

Installing Blend4web in Blender 2.76
https://www.youtube.com/watch?v=BzyJDVqfRwY