IMHO, we should switch from that mess to common repository of JS libraries (CJSAN), which can be referred using tags like <lib name="foo" version="1.0"><script

IMHO, we should switch from that mess to common repository of JS libraries (CJSAN), which can be referred using tags like <lib name="foo" version="1.0"><script .../></lib>. Such libraries will act as polyfills for an API, while browsers will be able to provide optimized versions of these libraries. I.e. instead of waiting for ecma262 to be implemented by all browsers, scripts can just load common polyfill, which then can be overridden by browser later: <lib name="ecma262" version="1.0"><script scr="https://cdn.host/ecma262.polyfill.js"/></lib>