It's not. It's a Unicode 'RIGHT SINGLE QUOTATION MARK' (U+2019), which in UTF-8 is encoded as 0xe2 0x80 0x99. 0xe2 is â in iso8859-1. 0x80 is not in iso8859-1,

It's not. It's a Unicode 'RIGHT SINGLE QUOTATION MARK' (U+2019), which in UTF-8 is encoded as 0xe2 0x80 0x99. 0xe2 is â in iso8859-1. 0x80 is not in iso8859-1, but is € in windows-1252. 0x99 is not in iso8859-1, but is ™ in windows-1252. So, the browser here appears to be defaulting to windows-1252.