![]() It is used by SMS when Emoji characters are supported. ![]() ![]() The Web Hypertext Application Technology Working Group (WHATWG) considers UTF-8 "the mandatory encoding for all " and that for security reasons browser applications should not use UTF-16. UTF-8, by comparison, accounts for 98% of all web pages. UTF-16 is the only web-encoding incompatible with ASCII and never gained popularity on the web, where it is used by under 0.002% (little over 1 thousandth of 1 percent) of web pages. Since May 2019, Microsoft has begun supporting UTF-8 (as well as UTF-16) and encouraging its use. It is rarely used for files on Unix-like systems. It is also sometimes used for plain text and word-processing data files on Microsoft Windows. UTF-16 is used by systems such as the Microsoft Windows API, the Java programming language and JavaScript/ECMAScript. UTF-16 arose from an earlier obsolete fixed-width 16-bit encoding, now known as UCS-2 (for 2-byte Universal Character Set), once it became clear that more than 2 16 (65,536) code points were needed. The encoding is variable-length, as code points are encoded with one or two 16-bit code units. UTF-16 ( 16-bit Unicode Transformation Format) is a character encoding capable of encoding all 1,112,064 valid character code points of Unicode (in fact this number of code points is dictated by the design of UTF-16).
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