Submit buttons don't send the button name

While writing a web server for my heating controller, I've realised
that Netsurf doesn't send the name of a submit button that has been
clicked in a form, unlike other browsers.

For example, when the form is called "view_specials" and the button
is called "next", other browsers return a string including:

view_specials?button=next

Whereas Netsurf returns just:

view_specials?

Is this an expected deficiency? If not, it's clearly wrong, so I'll
extract a suitable fragment of HTML and post a bug report.

Dave

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