Can a combining character be used alone in Unicode?

Question

Let\'s take COMBINING ACUTE ACCENT, for example. Its browser test page does include it alone in the page, but it reacts in a strange way: I can\'t select it with my mouse, a

Answer 1

Also, a dotted circle ◌ (U+25CC, ◌) character can be used as a base character.

Source: https://en.wikipedia.org/wiki/Dotted_circle