HTML Unicode (UTF-8) Reference
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HTML Unicode (UTF-8) Reference
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The Unicode Consortium
The Unicode Consortium develops the Unicode Standard.
Their goal is to replace the existing character sets with its standard Unicode
Transformation Format (UTF).
The Unicode Standard has become a success and is implemented in
HTML, XML, Java, JavaScript, E-mail, ASP, PHP, etc. The Unicode standard is also
supported in many operating systems and all modern browsers.
The Unicode Consortium cooperates with the leading standards development
organizations, like ISO, W3C, and ECMA.
The Unicode Character Sets
Unicode can be implemented by different character sets. The most commonly used
encodings are UTF-8 and UTF-16:
| Character-set | Description |
|---|---|
| UTF-8 | A character in UTF8 can be from 1 to 4 bytes long. UTF-8 can represent any character in the Unicode standard. UTF-8 is backwards compatible with ASCII. UTF-8 is the preferred encoding for e-mail and web pages |
| UTF-16 | 16-bit Unicode Transformation Format is a variable-length character encoding for Unicode, capable of encoding the entire Unicode repertoire. UTF-16 is used in major operating systems and environments, like Microsoft Windows, Java and .NET. |
Tip:
The first 128 characters of Unicode (which correspond one-to-one with ASCII) are
encoded using a single octet with the same binary value as ASCII, making valid
ASCII text valid UTF-8-encoded Unicode as well.
HTML 4 supports UTF-8. HTML 5 supports
both UTF-8 and UTF-16!
The HTML5 Standard: Unicode UTF-8
Because the character sets in ISO-8859 were
limited in size, and not compatible in multilingual environments, the
Unicode Consortium developed the Unicode Standard.
The Unicode Standard covers (almost) all the characters, punctuations, and symbols in the
world.
Unicode enables processing, storage, and
transport of text independent of platform and language.
The default character encoding in HTML-5 is UTF-8.
If an HTML5 web page uses a different character set than UTF-8, it should be
specified in the <meta> tag like:
Example
<meta charset="ISO-8859-1">
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The Difference Between Unicode and UTF-8
Unicode is a character set. UTF-8 is encoding.
Unicode is a list of characters with unique decimal numbers (code points). A =
65, B
= 66, C = 67, ....
This list of decimal numbers represent the string "hello": 104 101 108 108 111
Encoding is how these numbers are translated into binary numbers to be stored
in a computer:
UTF-8 encoding will store "hello" like this (binary): 01101000 01100101 01101100
01101100 01101111
Encoding translates numbers into binary. Character
sets translates characters to numbers.
HTML5 UTF-8 Character Codes
Below is a list of some of the UTF-8 character codes supported by HTML5:
| Character codes | Decimal | Hexadecimal |
|---|---|---|
| C0 Controls and Basic Latin | 0-127 | 0000-007F |
| C1 Controls and Latin-1 Supplement | 128-255 | 0080-00FF |
| Latin Extended-A | 256-383 | 0100-017F |
| Latin Extended-B | 384-591 | 0180-024F |
| Spacing Modifiers | 688-767 | 02B0-02FF |
| Diacritical Marks | 768-879 | 0300-036F |
| Greek and Coptic | 880-1023 | 0370-03FF |
| Cyrillic Basic | 1024-1279 | 0400-04FF |
| Cyrillic Supplement | 1280-1327 | 0500-052F |
| General Punctuation | 8192-8303 | 2000-206F |
| Currency Symbols | 8352-8399 | 20A0-20CF |
| Letterlike Symbols | 8448-8527 | 2100-214F |
| Arrows | 8592-8703 | 2190-21FF |
| Mathematical Operators | 8704-8959 | 2200-22FF |
| Box Drawings | 9472-9599 | 2500-257F |
| Block Elements | 9600-9631 | 2580-259F |
| Geometric Shapes | 9632-9727 | 25A0-25FF |
| Miscellaneous Symbols | 9728-9983 | 2600-26FF |
| Dingbats | 9984-10175 | 2700-27BF |
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