HTML uses standard 7-BIT ASCII when transmitting data over the Web. 7-BIT ASCII represents 128 different character values (0-127)
Hexadecimal values can be used to display non-standard letters and characters in browsers and plug-ins. HTML 4.01 supports the ISO 8859-1 (Latin-1) character set.
The lower part of ISO-8859-1 (codes from 0-127) is the original 7BIT ASCII standard. Most of these characters can be used without a character reference.
The higher part of ISO-8859-1 (codes from 160-255) can all be used using character entity names. Note that the entity names are case sensitive.
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