2.2.56 [HTML] Section 24.3, Character entity references for symbols, mathematical symbols, and Greek letters

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C0056:

The specification states:

 To support these entities, user agents may support full [ISO-10646] or use other 
 means. Display of glyphs for these characters may be obtained by being able to 
 display the relevant [ISO-10646] characters or by other means, such as internally 
 mapping the listed entities, numeric character references, and characters to the 
 appropriate position in some font that contains the requisite glyphs.

All Document Modes (All Versions)

Character entities for symbols, mathematical symbols, and Greek letters is supported by displaying the relevant glyphs from [ISO-10646].