For ES6 Safari has some of the best support of all browsers other than Chrome: http://kangax.github.io/compat-table/es6/ http://kangax.github.io/compat-table/es

For ES6 Safari has some of the best support of all browsers other than Chrome: http://kangax.github.io/compat-table/es6/ http://kangax.github.io/compat-table/es6/ Most features you are talking about are not yet Stage 2 supported. Chrome went ahead and built a lot of these features without full TC29 support. Many service worker features are still Stage 0/1. When it hits Stage 2 safari will gain support. I think the malice attributed to Apple is somewhat earned due to momentum in the PWA space, but is mostly just do to obeying TC29 stages.