2.1.133 [ECMA-262-1999] Section 15.10.2.12, CharacterClassEscape

V0196:

The production CharacterClassEscape :: s evaluates by returning the set of characters containing the characters that are on the right-hand side of the #WhiteSpace (7.2) or# LineTerminator ([ECMA-262-1999] section 7.3) production#s# __plus the characters <TAB>, <FF>, and <SP> < (characters \u0009, \u000C, and \u0020)__.

In JScript 5.x, the regular expression \s does not match any Unicode category Zs characters other than those explicitly listed in the preceding paragraph.