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V0142: When the mathematical value of HexDigits is above 0x10FFFF, the \u{...} is not treated as a Unicode code point
The specification states:
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21.2.1.1 Static Semantics: Early Errors RegExpUnicodeEscapeSequence :: u { HexDigits } • It is a Syntax Error if the MV of HexDigits > 0x10FFFF.
EdgeHTML Mode (All versions)
When the mathematical value (MV) of HexDigits is
above 0x10FFFF (decimal 1114111), the \u{...} is
treated as a regular string, not as a Unicode code point, and no Syntax Error
exception is thrown.