Reducing the amount of nesting within selectors

Check out this code snippet:

.signin-input{
        input{
            width: 100%;
            height: 2.5rem;
            color: black;

            :placeholder-shown{
                opacity: 1;
            }
        }
    

The CSS result looks like this:

.signin-input input :not(:placeholder-shown) {
      opacity: 1;
    }
    

An error is triggered due to a bad selector. How can we modify it so that Less handles it correctly, similar to this:

.signin-input input:not(:placeholder-shown) {
          opacity: 1;
    }
    

Answer №1

Make sure to include the &

.signin-input {
   input {
      width: 100%;
      height: 2.5rem;
      color: black;
      &:placeholder-shown {
          opacity: 1;
      }
   }
}

This will generate

.signin-input input:placeholder-shown {
  opacity: 1;
}

The parent selector can be represented using the & operator within nested rules. It is commonly used to apply a modifying class or pseudo-class to an existing selector. source: lesscss.org

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