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4.9 [CSS-Level1-2008] Section 7.1, Forward-compatible parsing

V0911:

The [CSS-Level1-2008] specification states:

Section 7.1: Selectors (element names, classes and IDs) can contain only the 
characters A-Z, 0-9, and Unicode characters 161-255, plus dash (-); they cannot 
start with a dash or a digit; they can also contain escaped characters and any 
Unicode character as a numeric code.

All Document Modes (All Versions)

Character encodings that require two bytes are allowed.

V0912:

The [CSS-Level1-2008] specification states:

The backslash followed by at most four hexadecimal digits (0..9A..F) stands for the 
Unicode character with that number.

All Document Modes (All Versions)

Character encodings that use six hexadecimal digits are allowed.

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