This vector shows what Named HTML entities that can be closed with !.
<img src=data: onerror="`&$[data1]!x`==`&$[data1];!x`?log('$[data1]'):0"><img src=data: onerror="`»!x`==`»!x`?alert('raquo'):0"><img src=data: onerror="`Í!x`==`Í!x`?alert('Iacute'):0"><img src=data: onerror="`Ý!x`==`Ý!x`?alert('Yacute'):0"><img src=data: onerror="`·!x`==`·!x`?alert('middot'):0"><img src=data: onerror="`ý!x`==`ý!x`?alert('yacute'):0"><img src=data: onerror="`ö!x`==`ö!x`?alert('ouml'):0"><img src=data: onerror="`°!x`==`°!x`?alert('deg'):0"><img src=data: onerror="`÷!x`==`÷!x`?alert('divide'):0"><img src=data: onerror="`Ú!x`==`Ú!x`?alert('Uacute'):0"><img src=data: onerror="`ç!x`==`ç!x`?alert('ccedil'):0"><img src=data: onerror="`à!x`==`à!x`?alert('agrave'):0"><img src=data: onerror="`¼!x`==`¼!x`?alert('frac14'):0"><img src=data: onerror="`²!x`==`²!x`?alert('sup2'):0"><img src=data: onerror="`ò!x`==`ò!x`?alert('ograve'):0"><img src=data: onerror="`û!x`==`û!x`?alert('ucirc'):0"><img src=data: onerror="`¥!x`==`¥!x`?alert('yen'):0"><img src=data: onerror="`í!x`==`í!x`?alert('iacute'):0"><img src=data: onerror="`<!x`==`<!x`?alert('LT'):0"><img src=data: onerror="`<!x`==`<!x`?alert('lt'):0"><img src=data: onerror="`ñ!x`==`ñ!x`?alert('ntilde'):0">