Browser: only JavaScript available on this platform. (Workaround: compile to JavaScript.)
Server side, standalone client etc.: I really don't know. There are sooooo many possibilities which are much-much better than JavaScript, every aspect (speed, elegance). Don't afraid to find reasons outside the technical domain, e.g. laziness, dumbness.
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Browser: only JavaScript available on this platform. (Workaround: compile to JavaScript.)
Server side, standalone client etc.: I really don't know. There are sooooo many possibilities which are much-much better than JavaScript, every aspect (speed, elegance). Don't afraid to find reasons outside the technical domain, e.g. laziness, dumbness.