Valid positions include
RGB input can be assigned by setting the
RGBA input can be assigned by setting the
Opacity can be assigned by including the
data-opacityattribute or by setting the
CSS-wide keywords can be assigned by setting the
keywordsoption to a comma-separated list of valid keywords:
transparent, initial, inherit.
This field has a default value assigned to it, so it will never be empty.
This field will always be uppercase.
Example with swatches.
Example with swatches and opacity.