Minecraft wiki entry for Marker, associated text: Markers do not cause any updates. Markers only exist on the server side[1], so they do not render. Using the debug key combination F3 + B, which normally draws the hitboxes of all visible entities, does not show a hitbox for a marker. Using F3 + I while aiming at a marker does not copy the entity data to the clipboard. They do not count towards the E-value (total amount of entities) listed on the debug screen. Markers do not obstruct the placement of blocks, nor do they push players or other entities away from their own position.