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Editorial Team
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Asked: 2026-05-15T07:24:00+00:00

Today, I have looked into HTML code of facebook.com, and found something like this:

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Today, I have looked into HTML code of facebook.com, and found something like this:

<input type="hidden" value="€,´,€,´,水,Д,Є" name="charset_test"/>

It’s repeated two times inside the <form>...</form>.

Any idea what this code might be useful for – some kind of server-side client charset detection? As far as I know, browser charset is being transmitted in HTTP request anyway (an “Accept-Charset” header).

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  1. Editorial Team

    Any idea what this code might be useful for – some kind of server-side client charset detection?

    Apparently so.

    The Euro sign is useful for charset detection because there are so many ways of encoding it:

    • E2 82 AC in UTF-8
    • 88 in windows-1251
    • 80 in the other windows-125x encodings
    • A4 in ISO-8859-7, -15, and -16
    • A2 E3 in GB18030
    • 85 40 in Shift-JIS
    • etc.

    As far as I know, browser charset is being transmitted in HTTP request anyway (an “Accept-Charset” header).

    It’s supposed to transmitted in the HTTP Content-Type header, but that doesn’t mean that user agents actually get it right.

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