Tracking which sections and passages have been seen
You can tell if the player has seen a passage or section using JavaScript:
if (squiffy.story.seen("passage3")) alert ("You have seen passage3!");
You can also conditionally display text:
You can see a [cupboard]. Maybe you should [open] it?
[open]:
You open the cupboard.
[cupboard]:
The cupboard is {if seen open:open, and there are empty bottles inside}{else:closed}.