Editing WoW:Useful macros (section)

=== Autoassist tank if tank target can harm ===
Autoassist tank if the tank's target can be attacked
 /target [@focustarget, harm, nodead]

* Use /focus to set focus on the main tank (or right click on the tank and select focus).
* Your target will be set to the main tank's target, but only if the tank is targeting an enemy which is alive.
* Works in 3.3

 #show Attack
 /target [@focustarget, harm, nodead]
 /startattack

* The melee dps version also starts attacking, and sets the icon to your attack ability.