Does the Swashbuckler Fancy Footwork require the melee attack to be successful?

@JeremyECrawford does the Fancy Footwork feature of the Swashbuckler rogue require the melee attack to be successful?

— Benjamin Grady (@BenjaminGrady) May 23, 2016

Fancy Footwork works whether or not your attack hits. #DnD https://t.co/gIhf4ifQwQ

— Jeremy Crawford (@JeremyECrawford) May 24, 2016