Regarding compatibility between ECMAScript specification and actual implementation; It is fairly easy to check out the data about browser support for ECMAScript
monkeylearn
crypto.com-exchange-api
luigi
gradual-typing
sjcl
nsurlcomponents
tomcat-jdbc
typo3-6.1.x
nsusernotificationcenter
ldap3
chrome-ios
i18next-http-backend
environment-modules
amcharts
scte-35
virtualenvwrapper
test-plan
libmemcache
android-jetpack-compose-modifier
botnet
sendbird-syncmanager
flask
activator
datastage
django-viewflow
aws-ebs
ms-forms
internet-explorer
bash
povray
