When an applet is launched and focused in a browser and then another TAB is selected in the browser the EmbeddedFrame doesn't receive WM_ACTIVATE(WA_INACTIVE) native message. On returning back to the applet and clicking, say, some textfield in the applet the textfield will not be able to receive key events. The latter is reproducible with JavaFX applets (see Comments), but is not reproducible with Java applets.
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