Minecraft wiki entry for Cobweb, associated text: A cobweb affects the player's movement abilities, as well. While in contact with it, the player can move at a speed of about 15% of the normal walking speed. Additionally, jumping vibrates the player akin to jumping in a 2-block-high space.‌[Java Edition only] A cobweb also limits the rate at which a player can break blocks. Like water, falling into a cobweb prevents a player from taking fall damage, meaning a fatal fall can be mitigated with cobwebs. Attacking while falling through cobwebs counts as a critical hit, the same as when falling after a jump.