// an attribute name, and an optional attribute value specification.”
	i = skipSpace(s, i)
	if _, j, ok := parseAttrName(s, i); ok {
		if _, k, ok := parseAttrValueSpec(p, s, j); ok {
			j = k
		}
		return s[i:j], j, true
	}
	return "", 0, false
}

func parseAttrName(s string, i int) (string, int, bool) {