The mouse pointer in the game is kind of 3D and in different colors as in the provided picture.
Linked issues
duplicates 1
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This was added in the 1.8 snapshots when in the F3 screen - the colors indicate the positive X, Y, and Z directions.
This is a duplicate of MC-45494. Please use the search function to check before posting in the future. If you could not find the original report, please comment with the keywords you searched for.
he report you have submitted is working as intended, mechanics of the game may change between updates. Things such as graphics, world creation, biomes, redstone, villagers and animals, may not work the same in current versions.
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Works as intended. This is the new crosshair when you press F3.