lighten is an Output Modifier that accepts a hex value and percentage (+ or -) option. Additionally, 'max' or 'rev' can be set as an option, with or without a percentage.
Result: lightens the $input hex color by 20%
Result: darkens the $input color by 30%
Result: if the $input value is above the $threshold value, 'ffffff' will be returned, else '000000' will be returned. The $threshold value can be defined in the Snippet properties.
Result: this would output the reverse of the $input hex (white or black) at 60% (so it'd be more of a medium grey in this case)
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