CSS Nesting support

[GrauBlitz]

Am I missing something or is the newish CSS nesting functionality not supported by this tool?

Test with nesting example from MSDN:

.parent {
  /* parent styles */
  & .child {
    /* child of parent styles */
  }
}

Tool output from https://www.minifier.org/css-validator:

1	1	warning	Rules without any properties specified should be removed.	Rule is empty.
3	3	error	This rule looks for recoverable syntax errors.	Expected RBRACE at line 3, col 3.
6	1	error	This rule looks for recoverable syntax errors.	Unexpected token '}' at line 6, col 1.