Java Edition 13w21a

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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_6 Java SE 6]</span>",
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 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.5.2|<span style=\"margin-right:-0.35em\">◄</span>◄  1.5.2]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.6.1|1.6.1]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.6.2| 1.6.2 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 13w19a|◄  13w19a]]\n</td>\n<td style=\"padding: 0.4em\">''' 13w21a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 13w21b| 13w21b ►]]\n</td>\n</tr>\n</table>"
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13w21a is the eighth snapshot for Java Edition 1.6.1, released on May 23, 2013^[1][2].

Donkeys, horses and mules

• Added a UI to control saddle/inventory/armor.
• Can be accessed by sneaking and right-clicking, or by pressing the inventory button while riding.
• Some features of the UI are specific to certain mobs:
  • All three mobs have a saddle slot.
  • Only horses have an armor slot.
  • Donkeys and mules have an inventory of 15 slots when given a chest.

Attribute system

• Started to move over various things to a new attribute system:
  • Item attributes using NBT data:
    • Attributes can be additive, subtractive and multiplicative using a set value.
    • Some items have default modifiers in place of previously hard-coded attributes.
    • Examples of possible changes players could make: A bow that slows the holder, a helmet that buffs health, etc.
  • Entity attributes:
    • These properties can now be changed as easily as any other NBT attribute.
    • Entity speed, base health, base attack.
  • Other properties like weapon damage/bow draw speed/sword swing speed are yet to follow.

Internal chat system

• Lots of messages should be translated now that were not previously.
• Messages are now better modularized.
• Server messages can be sent by their code-defined name, allowing the client to utilize the correct translation according to their language settings.
• Color can be specifically designated, preventing leakage into further messages.

Horse armor

• No longer stackable.

Tools

• Instead of replacing the barehanded damage (1HP👁 💔
  ), pickaxes, shovels, axes and swords now add their damage onto the barehanded damage.

Resource packs

• Lots of work toward a new resource pack system, but not finished yet.
  • Currently still compatible with texture packs.

12 issues fixed

From released versions before 1.6.1

• MC-1497 – Damaged anvils do not show damage in inventory or item frame.

From the 1.6.1 development versions

• MC-13626 – XP Bar shows up in creative.
• MC-13640 – Hay bales do not burn when set on fire.
• MC-13662 – XP, health, and hunger bar are buggy with horses.
• MC-13770 – Using a horse spawn egg on a horse works only when riding the horse.
• MC-13852 – Can't throw enderpearls while mounting a horse.
• MC-14220 – Player appearance not updating in multiplayer (armor, tools).
• MC-14417 – No way to remove armor or saddles off a horse.
• MC-14422 – Horse name tag is shown while riding.
• MC-15138 – Sides of cauldron has compass texture after placing compass in item frame.
• MC-15201 – Bottom part of some types of horses-harness is misplaced.

From the previous development version

• MC-15416 – Selected item disappears when armor breaks.