For def. see HTML 4.0.1 spec, page 133 (in pdf): "inheritance of alignment specification".

h align col/colgroup inheritance
--------fill-------------- | ---------fill-------- | --------fill-----------
right aligned | centered | centered
right aligned | centered | centered

v align col/colgroup inheritance
--------fill-------------- | ---------fill-------- | --------fill----------- |
top | bottom | bottom | - -
top | bottom | bottom | - -