Summary:
It is possible to place water/lava on the block that is behind( from the player's perspective) the cobweb. Also cannot get back into bucket.
It is possible to place water/lava on the block that is behind( from the player's perspective) the cobweb. Also cannot get back into bucket.
(Unassigned)
Community Consensus
cobweb, liquid, penetration, placement
Minecraft 1.8.1, Minecraft 1.8.2-pre1, Minecraft 1.8.2-pre4, Minecraft 1.8.2-pre6, Minecraft 1.8.2, Minecraft 1.8.3, Minecraft 1.8.4, Minecraft 1.8.5, Minecraft 1.8.6
Retrieved
Confirmed. As long as you click a block not occupied by the cobweb itself (such as a block behind it), the water/lava gets placed (but can't be picked up through the cobweb).