Fluid or fixed grid system, in responsive design, based on Twitter Bootstrap

I’m getting confused about the various options in the twitter bootstrap grid, and how they go together.

To begin with, you can have an ordinary fixed container, or a container-fluid.

Then either one can include either an ordinary row, or a fluid row, row-fluid. That is, you can have a fixed container with a fluid row, or a container-fluid… with a fixed row?

Then on top of that, you can include the ‘responsive’ media queries, or not.

I am getting confused as to how these things interact. But let’s start with one obvious example.

On the examples page itself, there’s what’s presented as an example of both a fixed grid and a fluid grid

However, in my browser, on that example page itself — both grids behave identically. Perhaps because the example page uses the optional responsive media queries? In both grid examples, if I start gradually narrowing my browser window, the grid elements do not get gradually narrower — once a certain (responsive) boundary width is reached, they snap to a smaller size, and again at further boundary widths. But both the ordinary ‘fixed’ example AND the ‘fluid’ example behave exactly the same here — so what the heck is the difference?

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