// Line comments are not part of any published CSS standard but
		// are supported by the 4 major browsers.
		// This defines line comments as
		//     LINECOMMENT ::= "//" [^\n\f\d]*
		// since https://www.w3.org/TR/css3-syntax/#SUBTOK-nl defines
		// newlines:
		//     nl ::= #xA | #xD #xA | #xD | #xC
	default:
		panic(c.state.String())
	}

	i := bytes.IndexAny(s, lineTerminators)
	if i == -1 {
		return c, len(s)