These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.96 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/mathjax-3.2.2-r2:0/3.2.2::gentoo  USE="-doc" 6047 KiB

Total: 1 package (1 new), Size of downloads: 6047 KiB