https://drafts.csswg.org/css-flexbox/#propdef-justify-content
8.2. Axis Alignment: the justify-content property
8.3. Cross-axis Alignment: the align-items and align-self properties
Proposal, have secondary component for each of the above mentioned attributes when
'flex-wrap' setting is active. The secondary component will control how the items will be aligned
using the remaining row-space, if the items didn't fully utilize all the space.
This has applications typically for the last wrapped row, however, their could be 3 versions. start-row, middle-rows, end-rows on how to deal with layout, when items are of different sizes.
This would then ensure that they layout looks aesthetically pleasing for the lead into layout navigation, middle navigation and lead out of navigation section.
See article with discussion of problem here:
https://css-tricks.com/snippets/css/a-guide-to-flexbox/