[] returns the macro to the default action as if no options were specified.
Normally a macro with options will do nothing if none options of the options are met. by adding [] to the end of the option list it says ok... so nothing else has matched lets behave as if no options were present so a heal will heal your target if it can otherwise it will heal the caster.
Code:
/cast [target=focustargettarget, help][] Heal;
Code:
/cast [target=focustargettarget,help] Heal; Heal
both of the above are identical but the form saves 2 characters... a saving of 15 characters when the spell is Summon Voidwalker
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