Changes the opacity of some text. Contains an optional parameter to specify opacity between 0 (transparent) and 1 (opaque)
The following is used to create text with 25% opacity:
{{opacity|0.25|Example Text}}
Which produces this: Example Text
You can also leave the first parameter blank to use the default of 50%.
{{opacity||Example Text}}
Which produces this: Example Text
Invalid inputs for opacity will produce text will full opacity.