A common problem, rarely discussed

Styles are not always individual properties pertaining to an individual subject. Often there are times when what the user perceives as a style or feature, must be implemented as multiple styles applied to multiple subjects.

If one of the sub-styles is not applied, or applied incorrectly, then the total style fails.


ScalaCSS has a feature to address this. It's called a composite style, StyleC. It is a composite of sub-styles, each given unique names.

StyleC was removed in 0.4.0. (Why? See #48.)

There is currently no replacement.

Ideas for an appropriate replacement can be discussed in #71.


ScalaCSS's philosophy is to provide tools, not force decisions upon you. If you want or need to style children without type-safety, you can do so using unsafeChild. It works just like how you'd expect it to if you were using SASS or LESS.

object YOLO extends StyleSheet.Inline {
  import dsl._

  val example = style(



This is named unsafeChild to highlight that you're opting out of type-safety and that care should be taken during refactoring and style management. It is not unsafe in other ways — your other styles will be completely unaffected, servers won't catch fire, your mother won't fall down stairs.