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 declared by under 0.002% of web pages (and many of these are actually UTF-8 because of "contradictory character encoding specifications" and/or "incorrect character encoding defined"). It is used by SMS (the SMS standard specifies UCS-2, but almost all users actually implement UTF-16 so that emojis work). 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 code points of Unicode (in fact this number of code points is dictated by the design of UTF-16).
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