Regarding compatibility between ECMAScript specification and actual implementation; It is fairly easy to check out the data about browser support for ECMAScript
unstage
minmax
htdocs
libev
flask-injector
wagtail-streamfield
flutter-stripe
wayland
python-crfsuite
ggridges
tidyverts
touchscreen
flask-restplus
razor-component-library
shellexecute
uiapplication
ie-compatibility-mode
extended-precision
nsstring
rapidapi
yubico
parametric-polymorphism
std-system-error
chrome-ux-report
video-streaming
aws-lex
moodle-boost
libclang
yeoman-generator
merge