What does the following piece of code do?

document.write("<h" & i & ">This is header " & i & "</h" & i & ">")

Nothing to do with Visual Basic. That's JavaScript.

Anyway, it writes a HTML header tag. Variable i should be from 1 to 6 and the output would be following HTML snippet if i = 3:

<h3>This is header 3</h3>

Technically, it's VBScript, NOT JavaScript.

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