Answers for "6An invalid form control with name='' is not focusable."

an invalid form control with name='' is not focusable

add novalidate in your form
Example:
<form action="" novalidate>
</form>

An invalid form control with name='beacon_serial' is not focusable

To solve the problem, if you have a button on your page that does 
something else other than submit or reset, always remember
to do this: <button type="button">