type (
	// CSS encapsulates known safe content that matches any of:
	//   1. The CSS3 stylesheet production, such as `p { color: purple }`.
	//   2. The CSS3 rule production, such as `a[href=~"https:"].foo#bar`.
	//   3. CSS3 declaration productions, such as `color: red; margin: 2px`.
	//   4. The CSS3 value production, such as `rgba(0, 0, 255, 127)`.
	// See https://www.w3.org/TR/css3-syntax/#parsing and

		// 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)