2.1.44 [ECMA-262/9:2018] Section 21.2.2.10 CharacterEscape

V0175: Characters other than those matched by ControlLetter (non-alphabetic characters) are allowed

The specification states:

 21.2.2.10 CharacterEscape
  
     The CharacterEscape productions evaluate as follows:
  
         CharacterEscape ::
             ControlEscape
             c ControlLetter
             0 [lookahead ∉ DecimalDigit]
             HexEscapeSequence
             RegExpUnicodeEscapeSequence
             IdentityEscape
  
     1. Let cv be the CharacterValue of this CharacterEscape.
     2. Return the character whose character value is cv.

EdgeHTML Mode

Characters other than those matched by ControlLetter (non-alphabetic characters) are allowed.