While determining that ChromeBook browser does NOT support webusb,
I discovered Beagle Term, which can replace e.g. PuTTY for sending nanoVNA commands:
As a Chrome browser app, that means it needs installing only once
if you are a person with multiple PC operating system installations
that all use Chrome browser.
Beagle Term also becomes another method of verifying nanoVNA webusb functionality
without involving Web-Client.
Oristo