If you swap in the extension cable head, that does indeed have a ground pin, at least in Australia anyway. The grounding comes from that metal ring that the connector uses as a guide. https://www.apple.com/au/shop/product/mw2n3x/a/power-adapter...

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ddlsmurf 2 hours ago | parent [-]

only two prongs of which make it through. Usually the regulation as I understand is that it's fine if you can prove the case can never get in contact with anything electric, for most laptops that's just being made of plastic.

	▲	bragr an hour ago \| parent [-]
		As has been established in other threads here, the metal button thing the prongs slide onto is an earth connection.