A linked stylesheet changed in a way with no style name to show, so the screen stays in Changes, opens its side-by-side comparison, and Details says the change can apply anywhere with nothing to list.

Why this screen — A changed rule without a style name, such as an animation or font rule, keeps the screen in Changes with no list to show. The lead sentence therefore ends with a full stop instead of a colon, and the same wording carries both the listed and the unlisted case.