Readonly appReadonly appReadonly defaultDefault locale of the browser. The locale we are guaranteed to have resources for that should be used as a last resort fallack in cases where requested locales do not match available locales.
Readonly isReturns whether the current app locale is RTL.
Readonly lastLast fallback is the final fallback locale we're going to attempt if all else fails in any language negotiation or locale resource retrieval situations.
At the moment it returns en-US.
Readonly requestedReturns the top-requested locale from the user, or an empty string if none is set.
Optional aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
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Returns the best locale that the application should be localized to.
The result is a valid locale ID and it should be used for all APIs that do not handle language negotiation.
When retrieving the locales for language negotiation and matching to language resources, use the language tag form. When retrieving the locales for Intl API or ICU locale settings, use the BCP47 form.
Where possible, appLocales* should be preferred over this API and all callsites should handle some form of "best effort" language negotiation to respect user preferences in case the use case does not have data for the first locale in the list.
Example: "zh-Hans-HK"