[shados]

Any example? Since stage 3 is roughly "request for implementers", and Stage 4 requires 2 real world implementations and essentially mean "will be part of the standard in the next wave".

The closest thing I can think of is ES6 modules, because the module loader spec wasn't finished, but the syntax still lived on.

Now, stuff getting kicked down from Stage 3, that has happened.

[pjmlp]

I was wrong, on my mind I was thinking SIMD has been dropped during stage 4.