Is that actual web standards, or just what is listed on caniuse.com? The reason I ask is that a lot of "standards" aren't actually standards:
Service workers are not yet a standard: "This is a living document. Readers need to be aware that this specification may include unimplemented features, and details that may change. Service Workers 1 is a version that is advancing toward a W3C Recommendation." (https://w3c.github.io/ServiceWorker/)
Web Application Manifest is not yet a standard: "This document was published by the Web Applications Working Group as a Working Draft using the Recommendation track.
Publication as a Working Draft does not imply endorsement by W3C and its Members." (https://www.w3.org/TR/appmanifest/)
Background sync is not a standard: "This specification was published by the Web Platform Incubator Community Group. It is not a W3C Standard nor is it on the W3C Standards Track." (https://wicg.github.io/background-sync/spec/)
Cookie store is not a standard: "This specification was published by the Web Platform Incubator Community Group. It is not a W3C Standard nor is it on the W3C Standards Track." (https://wicg.github.io/cookie-store/)
Streams is not a standard, it's just a specification: "This specification provides APIs for creating, composing, and consuming streams of data that map efficiently to low-level I/O primitives." (https://streams.spec.whatwg.org)
So does Safari suck because it's not supporting actual standards, or does it only suck in comparison to Chrome because Chrome is willing to implement technologies that aren't finalized standards and technologies that aren't even on a standards track?