Why did Safari drop support for SharedWorker?

Issue

Why did Safari drop support for SharedWorker?

And are there any working polyfills using, for example, localStorage and StorageEvent as a communication port? (Yes, the shim would have to detect and recreate the master Worker)

Solution

Directly from one of the WebKit Engineers:

The implementation of Shared Web Workers was imposing undesirable constraints on the engine. It never gained any adoption.

Source here

Answered By - John Tregoning