YOU SAID:
'">>"> prompt(1)@gmail.com'-->"> alert(document.cookie)"> '">
INTO JAPANESE
'">>"> プロンプト (1) @gmail .com '-->"> alert(document.cookie)"> '">
BACK INTO ENGLISH
' "> >" > Prompt (1) @gmail.com '--> "> alert(document.cookie)" > ' ">
INTO JAPANESE
'"> >"> (1) @gmail.com をプロンプト '-->"> alert(document.cookie)"> '">
BACK INTO ENGLISH
' "> >" > (1) @gmail.com prompt ' –-> "> alert(document.cookie)" > ' ">
INTO JAPANESE
'"> >"> (1) @gmail.com プロンプト '-->"> alert(document.cookie)"> '">
BACK INTO ENGLISH
' "> >" > (1) @gmail.com prompt ' –-> "> alert(document.cookie)" > ' ">
That didn't even make that much sense in English.
