Block tag (Java Edition)

A block tag is a group of blocks. They are used in advancement and world generation files to determine which block types meet a condition. Some block tags enable special behavior for the contained blocks. They can also be used when testing for block arguments in commands with #<resource location>, which succeeds if the block matches any of the blocks specified in the tag.

Used by the frost_walker enchantment definition, to only replace water below blocks in this tag.

Special behavior: When placing a hanging sign below blocks in this tag while not sneaking, if the direction matches, the sign is placed with the two parallel chains.