185 Relativizer that or what in non-restrictive contexts

A - feature is pervasive or obligatory6
B - feature is neither pervasive nor extremely rare19
C - feature exists, but is extremely rare9
D - attested absence of feature25
X - feature is not applicable (given the structural make-up of the variety/P/C)9
? - no information on feature is available9

Feature area:
Typical example:
My daughter, that/what lives in London,…
Example source:
Kortmann/Szmrecsanyi (2004)
Variety World Region Type Value
Id Primary text Variety Variety Type