US QWERTY keyboards like the author is almost certainly using have the backtick above the Tab key, shared with ~, and it’s commonly used in programming.
I blame Microsoft, as it was their software where I was first introduced to "smart" quotes using the extending characters/glyphs of fonts. I can also tell when importing someone's data that was copy/pasted from an Office type program with its auto"correcting" to smart typography.
See https://en.wikipedia.org/wiki/Grave_accent#As_surrogate_of_a...
US QWERTY keyboards like the author is almost certainly using have the backtick above the Tab key, shared with ~, and it’s commonly used in programming.