The ICU Message Syntax Tester is a tool that allows you to create and parse ICU message patterns. ICU message patterns are used in internationalization libraries like FormatJS, i18next and others.
The name of the variable that is used in the translation
The selector that is used in the translation
The formatted message based on the input
The message pattern that is used in the translation
The value of the variable that is used in the translation
Different locales may have different formatting rules for the same message pattern