Toggle displaying of damage meter, floating combat text and portrait feedback by mod-clicking your character's or pet's portrait.
Damage meter
<Alt> + <Click (any)> toggles damage meter
Floating combat text
<Shift> + <Left-Click> toggles floating damage text
<Shift> + <Right-Click> toggles floating healing text
<Shift> + <Wheel-Click> reports floating combat text status
Portrait feedback
<Ctrl> + <Left-Click> enables portrait feedback on your character's or pet's portrait
<Ctrl> + <Right-Click> disables portrait feedback on your character's or pet's portrait
<Ctrl> + <Wheel-Click> reports portrait feedback status for both your character's and pet's portrait

