Intent to implement: ResizeObserver

[eeeps]

https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/iHXS9S66bAw

This + Houdini’s custom @-rules → a 🤘Element Query prolyfill → wide adoption → native EQs → world peace.

“But why wait to whip up a spec?” the RICG pondered proddingly:
https://twitter.com/respimg/status/735119358452719616