Form fields with only an id attribute are not submitted at all.
Form fields with only a name attribute are not linked to their label.
There are no differences between 'Strict mode' and 'Quirks mode'.
On this page I research serious problems with the id attribute of a form field.
The problem is that browsers only send form fields that have a name attribute to the
server. On the other hand, clicking on a label tag only works if the form field it belongs
to has an id.
Each form field in the form below has an id attribute.
Each form field in the form below has a name attribute.
Therefore if you want to use labels and submit the form you must use both attributes
for each form field: id and name.