The visual viewport API gives you details on how the user zooms and scrolls around your page.
Async functions allow you to write promise-based code as if it were synchronous
A deep-dive into the service worker lifecycle.
Chrome 46 brought new methods to caches, as does Chrome 47, and probably 48. It never stops.
"Promises simplify deferred and asynchronous computations. A promise represents an operation that hasn't completed yet."
Every click interaction in mobile browsers is hampered with a 300ms delay, but that's gone in Chrome 32 for mobile-optimised sites!