Is well formed without a ?

<input> without a <form> appears valid, yes (at least for html 4.01, look near the end of 17.2.1):

The elements used to create controls
generally appear inside a FORM
element, but may also appear outside
of a FORM element declaration when
they are used to build user
interfaces. This is discussed in the
section on intrinsic events. Note that
controls outside a form cannot be
successful controls.

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