Make something blink on and off every second

Im trying to make a line blink on and off every second. How would I do this?

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@Squiglz Maybe not the smartest way, but it seems to work:

$(floor(#Ds#*0.5))==(ceil(#Ds#*0.5))?100:0$

This will find out if a second is odd or even. In one case transparency is set to 100, in the other case to 0.

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