The CSS Values and Units Module Level 3 defines[1] logical direction versions of the units 'vw' and 'vh' called 'vi' and 'vb'. So those units should be implemented. Sebastian [1] https://drafts.csswg.org/css-values-3/#viewport-relative-lengths
'vi' and 'vb' units have been moved to CSS Values and Units Module Level 4. https://drafts.csswg.org/css-values-4/#viewport-relative-lengths
*** This bug has been marked as a duplicate of bug 232895 ***