gistfile1.txt

#foo {
  color: red;
}

"color" is the property.
"red" is the value.
"color:red" is the declaration.

Spec: http://www.w3.org/TR/1998/REC-CSS2-19980512/syndata.html#declaration

@mdix: I don’t remember that CSS uses the concept of assignment to describe its syntax.

This is a declaration:

property: value

This is a series of declarations (term not used in the spec):

property: value;
property: value;

This is a declaration block:

{
    property: value;
    property: value;
}

This is a rule set:

selector {
    property: value;
    property: value;
}

Jepp, it doesn't. I think it would be best described as implicit declaration.