Optional ReadonlybusyOptional ReadonlyclassAdditional class, e.g. to position the button within its container.
Optional ReadonlydisabledReadonlyiconcodicon(...) class of the glyph.
ReadonlyonReadonlytitleHover text and accessible name; an icon-only control has no other label.
Spins the glyph, e.g. while the action it triggered is still running.