When i was a little kid, I was really scared of the dark. But then I came to understand, dark just means the absence of photons in the visible wavelength -- 400 to 700 nanometers. Then i thought, well, its really silly to be afraid of a lack of photons. Then i wasn't afraid of the dark anymore after that.
Elon Musk

:past

The :past CSS pseudo-class selector is a time-dimensional pseudo-class that will match for any element which appears entirely before an element that matches :current. For example in a video with captions which are being displayed by WebVTT.
:past css reference