Regarding compatibility between ECMAScript specification and actual implementation; It is fairly easy to check out the data about browser support for ECMAScript
bunnycdn
tcolor
pedometer
phonegap-plugins
latex-environment
sbt-jmh
antd-mobile
fast-app-switching
dynamic-image-generation
qheaderview
pypyodbc
nginx
ice
azure-hdinsight
remotestorage
go-echo
cross-compiling
inline-view
genius-api
embroider
brunch
spring-java-config
prestashop-1.7
android-bottomnav
ionic-appflow
file-format
pahocpp
react-native-keychain
temenos-quantum
second-level-cache
