Meeseeks.CSS.css

You're seeing just the macro css, go back to Meeseeks.CSS module for more information.
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css(string_literal)

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Compiles a string representing CSS selector syntax into one or more Meeseeks.Selectors.

When a static string literal is provided this work will be done during compilation, but if a string with interpolated values or a var is provided this work will occur at run time.