CSS Inline currently defines an inline-sizing property that changes how the height of inline boxes is calculated.

The name is a problem because we have an unrelated inline-size property for declaring width or height based on the logical writing-mode.

As far as I know, there are no implementations of inline-sizing. There are definitely implementations of inline-size.

So this issue is to bikeshed a new name for the property as described in the spec.

(Note that I personally do not understand enough about inline layout to interpret that description, so I cannot offer any good suggestions. Only that it shouldn't be the same as another property with a grammatical tense change. If someone is able to draw some pretty pictures demonstrating how this property would affect layout, that might help other people come up with name suggestions!)