What is the correct syntax to lighten a color in Liquid?

The correct syntax to lighten a color in Liquid is achieved using the color manipulation filter called color_lighten. When you apply this filter, it takes the hex color code as input and a percentage value that indicates how much you want to lighten the color.

In this case, {{ '#ffc107' | color_lighten: 30 }} will take the base color of #ffc107 (a shade of yellow) and lighten it by 30%. This is inline with Shopify's filtering capabilities that allow you to perform various color manipulations, making it easy to design themes with the desired aesthetics without needing external tools.

Focusing on the context of other choices, it's important to note that while there are color manipulation features available in Liquid, the specific syntax used in the other options does not follow the correct structure for lightening colors in Shopify themes. Only the color_lighten filter correctly identifies the operation while adhering to the proper syntax established within the Liquid language for color adjustments.