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After the Applet API is deprecated the javafx.appliction.HostServices.getWebContext method needs to be deprecated as well, since it is only used when running a JavaFX application an applet in a browser.
I filed JDK-8157508 as a follow-up issue to track adding the (since = "9") property to the @Deprecated annotation (we cannot add it until we upgrade to a newer version of JDK 9 for compilation).