[nl]

Modifiers have been a thing since at least Netscape 4[1][2]

I'm pretty sure I remember using it earlier than that but can't be 100%.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=46845#c7

[2] http://www.bu.edu/uis_web3270/en/doc/troubleshoot/pd_ck_down...