Why are IDs necessary?

[tommedema]

Without any proper documentation I find it hard to create a minimalist implementation of TilesJS.

My goal is to create an infinitely scrolling grid, where more tiles appear when the user scrolls down. At any point in time there should be a predefined number of tiles visible on the user's viewport (e.g. 5 tiles), where each tile is sized depending on it's importance. E.g. there may be 1 huge important tile, 1 mediumly sized important tile, and 3 normally sized tiles.

The requirement to specify a fixed number of IDs per tile does not play well with this. Why is this necessary? Could you perhaps lead me in the right direction on achieving my goal?

So far I've come up with the following minimalist approach, but it is still dependent on a fixed number of IDs: http://jsfiddle.net/tommedema/GZn8g/2/