WASM, in broswers, runs entirely inside a secure environment with no access to the system.
js->browser->os
|
+--Flash/java-->os
vs wasm->browser->os
further. WASM and Js are in their own process with no os acesss. they can't access the os except by rpc to the broswerflash/java tho, ran all user code in the same process with full access to the os