In our various application forms we test for valid entry and required entry, and if invalid/missing we redbox the field and drop a text note immediately under the field. No drama there.
We do have cases though where there is a set of fields where each field might well be valid but the whole does not validate (eg. the street/town/postcode/state each have valid values, but the address doesn't actually exist). Similarly, we may have a set of fields where we have an "at least one" requirement (eg. enter at least one of home/work/mobile phone #).
So, we have a
<fieldset> which might be invalid.
Any suggestions as to how to visually represent this? We don't want to redbox each of the enclosed fields of course.