After 14 years Apple is removing Dashboard. macOS Catalina will no longer support it, and Apple recently removed Dashboard support from WebKit (via Mac Otakara).
Dashboard
First introduced with OS X Tiger in 2005, Dashboard gave users various widgets, like a clock/calendar, calculator, weather, and more. It’s been disabled by default since OS X Yosemite, which is why you’re forgiven if you’ve forgotten about Dashboard.
WebKit’s changelog mentions the removal.
Further Reading:
[Developers Wanted: Apple Announces Dashboard Widget Contest]
Meanwhile, aboard the Enterprise in pursuit of a megalomaniacal enhanced human:
Kirk: ‘Aren’t you supposed to be dead?’
Dashboard: ‘I’ve been dead before’.
Scotty: ‘Captain, you’d better get down here. It’s Dashboard’
Kirk: ‘Scotty, re-enable my widgets!’
Scotty: ‘I can’t, Captain; it’ll flood the RAM and hog the CPU!’
Dashboard: ‘I have been, and will always be your least used and least loved OS function.’
Hmmm, what about Stickies? I better move mine over to Notes.