This single line is set not to wrap, and its box cuts it with an ellipsis well before the edge of the page, however far the text itself would run.
This single line is set not to wrap, and nothing cuts it, so it runs out of its box and on past the right edge of the page.
The first card of the moving track sits mostly off the left side of its window at the first frame.
The second card ends seven pixels from the edge of the window at the frame the capture caught, and a moment later it would not, so the distance is no gutter at all.
The third card waits past the right side of the window.
The first card of the parked track sits mostly off the left side of its window.
The second card ends seven pixels from the edge of the window and stays there, because nothing moves this track: a script parked it with a transform, and that is the gutter a visitor gets.
The third card waits past the right side of the window.