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Defines how long the transition has to wait before starting.

default transition-delay: 0s;

The transition will wait zero seconds, and thus start right away.

transition-delay: 1.2s;

You can use decimal values in seconds with the keyword s.

transition-delay: 2400ms;

You can use milliseconds instead of seconds, with the keyword ms.

transition-delay: -500ms;

You can use negative values: the transition will start as if it had already been playing for 500ms.