Returns a string where all alphabetic characters have been converted to uppercase, taking into account the host environment's current locale.
The required stringVar reference is a String object or string literal.
The toLocaleUpperCase method converts the characters in a string, taking into account the host environment's current locale. In most cases, the result is the same as the result the toUpperCase method. Results differ if the rules for a language conflict with the regular Unicode case mappings.
Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported Store apps (Windows 8 and Windows Phone 8.1). See Version Information.