Java Edition 17w15a

17w15a is the fifth snapshot released for 1.12.

General

 * Advancements
 * Added descriptions to advancements & changed some titles
 * The Adventuring Time achievement has been made into an advancement
 * Narrator


 * Added a toast notification for toggling the narrator
 * Added the option to toggle narrator between: off, chat & system, chat only, system messages only

Blocks

 * Bed
 * Added colored beds which can be crafted with colored wool or by dying a white bed
 * Beds now bounce the player like slimeblocks, albiet much less
 * Beds now reduce fall damage when landed on

Changes

 * Made stairs a little more solid, allowing torches, fences, glass panes, walls & snow to connect to them properly
 * Reintroduced the book recipe