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What does this " $0 "mean ?!

I have seen this line of code in an online course " const heading = $0; "so i wanna understand ehat it means

15th Nov 2019, 8:46 AM
Marina Khamis
Marina Khamis  - avatar
1 Odpowiedź
0
I want to say $0 refers to the DOM or the HTML element itself but I may be wrong.
15th Nov 2019, 12:55 PM
Anthony Johnson
Anthony Johnson - avatar