stylo_arc is used at run time in 5 crates (of which 1 optionally).

Depender (with downloads and own rev deps) stylo_arc version
500 2 stylo_malloc_size_of ^0.4
420 3 stylo_selectors ^0.4
400 1 stylo_traits ^0.4
400 stylo ^0.4
420 3 stylo_to_shmem optional ^0.4.0