Fullscreen Minecraft!!!
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I just recently discovered this on accident, this is only confirmed on Mac. Please Test on Linux, and Windows.
Mac:1. Load a single player file or connect to server.
2. If your F1-12 keys are screen brightness, volume, ect. hold "fn" in next step.
3. Hold any modifyer key (control, option, command) and press F11
4. Enjoy!!
Linux: Please test!!!
Windows: Please test!!!