  We study stable commutator length on mapping class groups of certain
infinite-type surfaces. In particular, we show that stable commutator length
defines a continuous function on the commutator subgroups of such infinite-type
mapping class groups. We furthermore show that the commutator subgroups are
open and closed subgroups and that the abelianizations are finitely generated
in many cases. Our results apply to many popular infinite-type surfaces with
locally coarsely bounded mapping class groups.
