<os:Image width="16" height="16">data:image/x-icon;base64,AAABAAEAEBAQAAEABAAoAQA
AFgAAACgAAAAQAAAAIAAAAAEABAAAAAAAAAAAAAAAAAAAAAAAEAAA
AAAAAAAEAgQAhIOEAMjHyABIR0gA6ejpAGlqaQCpqKkAKCgoAPz9/AAZGB
kAmJiYANjZ2ABXWFcAent6ALm6uQA8OjwAiIiIiIiIiIiIiI4oiL6IiIiIgzuIV4iIiIhndo53K
IiIiB/WvXoYiIiIfEZfWBSIiIEGi/foqoiIgzuL84i9iIjpGIoMiEHoiMkos3FojmiLlUipYliEWIF
+iDe0GoRa7D6GPbjcu1yIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIgAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
</os:Image>
Hmmm... Solo leggendo così, direi che il blocco di dati, compreso tra i due tag "
<os:Image width="16" height="16">" e "
</os:Image>" *sia* l'icona in questione, codificata in base 64 come l'attachment di una mail.
Hmmm....
Cercando su San Google, ho trovato
questa pagina, che rimanda a
questo tool...
Chi fa esperimenti, visto che io ho ancora il Firefox vecchio?