If I go to https://www.tradingview.com/chart/?symbol=BINANCE:BTCUSDTPERP and press OPT+g (ALT+g for non-mac) it pops up a 'GoTo DateRange' overlay:

I observe that it is the key-UP that triggers this.

I'm trying to simulate this from the Javascript console (Chrome) using:

b = document.body;
b.focus();
b.dispatchEvent(new KeyboardEvent('keydown', {'key':'g', 'altKey':true} ));
b.dispatchEvent(new KeyboardEvent('keyup', {'key':'g', 'altKey':true} ));

However nothing happens.

Why is this? Could it be a Chrome security/permissions issue?

Ref: Firing a keyboard event on Chrome