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Could you please tell me whether there exists any difference of nuance between

a) If you do everything correctly, you should see a blank web page.

b) If you've done everything correctly, you should see a blank web page.

?

Thank you in advance!

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(a) would be used before you've done those things, in anticipation.

(b) would be used after you've done those things, or even if before, from the perspective of imagining that the things have been done.