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2.2.1 [ISO10646] Section 14, Implementation Levels

C0001:

The specification states:

ISO/IEC 10646 specifies three levels of implementation. Combining characters are 
described in clause 25 and listed in annex B.

14.1 Implementation level 1
When implementation level 1 is used, a CC-dataelement shall not contain coded 
representations of combining characters (see clause B.1) nor of characters from the 
HANGUL JAMO block (see clause 26.1). When implementation level 1 is used the 
uniquespelling rule shall apply (see clause 26.2).

14.2 Implementation level 2
When implementation level 2 is used, a CC-dataelement shall not contain coded 
representations of characters listed in clause B.2. When implementation level 2 is 
used the unique-spelling rule shall apply (see clause 26.2).

14.3 Implementation level 3
When implementation level 3 is used, a CC-dataelement may contain coded 
representations of any characters.

All Document Modes (All Versions)

Coded representations of characters not allowed in implementation levels 1 or 2 (for example, 0x0483) are displayed. Therefore, Windows Internet Explorer is considered to be at implementation level 3.

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