Flow Layout and Overflow - CSS: Cascading Style Sheets
block-axis overflow there is also a proposal for a block-overflow property, although at the time of writing the name is still up for discussion.

CSS Overflow - CSS: Cascading Style Sheets
reference css properties overflow overflow-block overflow-inline overflow-x overflow-y text-overflow block-overflow line-clamp max-lines continue non-standard properties -webkit-line-clamp specifications specification status comment css overflow module level 3the definition of 'overflow' in that specification.