By default, we now generate new applications which support only evergreen browsers, as a result differential loading is now opt-in.
A new flag `--legacy-browsers`, was added to generate applications which support non evergreen browsers such as Internet Explorer 11.
**Note**: After an application is generated opting in and out of differential loading is still possible through the supported browsers configuration in the browserslist configuration file defaulted to `.browserslistrc`.
10.1 and iOS Safari 10.3
The nomodule polyfill needs to be loaded prior to any script and be
outside of webpack compilation because otherwise webpack will cause the
script to be wrapped in `window["webpackJsonp"]` which causes it to
fail.
This polyfill will only be injected when the either Safari 10.1 or iOS
Safari 10.3 support is required, which is based on the browsers defined in browserslist file.
Fixes#14680
