utf8 encoding problem

[Skip Montanaro]

    >> Luckily that is not true, otherwise it would be completely impossible
    >> to have websites using non-ascii input. To be specific, the encoding
    >> used for HTML forms is determined by: [algorithm omitted]

    Martin> As Denis explains, it is true. See 17.13.4

Sorry, but I'm coming to this discussion late.  See "17.13.4" of what
document? 

Thx,

Skip