PR.registerLangHandler(
  PR.createSimpleLexer(
    [["pln", /^[\t\n\f\r ]+/, null, " \t\r\n"]],
    [
      ["str", /^"(?:[^\n\f\r"\\]|\\(?:\r\n?|\n|\f)|\\[\S\s])*"/, null],
      ["str", /^'(?:[^\n\f\r'\\]|\\(?:\r\n?|\n|\f)|\\[\S\s])*'/, null],
      ["lang-css-str", /^url\(([^"')]*)\)/i],
      [
        "kwd",
        /^(?:url|rgb|!important|@import|@page|@media|@charset|inherit)(?=[^\w-]|$)/i,
        null
      ],
      [
        "lang-css-kw",
        /^(-?(?:[_a-z]|\\[\da-f]+ ?)(?:[\w-]|\\\\[\da-f]+ ?)*)\s*:/i
      ],
      ["com", /^\/\*[^*]*\*+(?:[^*/][^*]*\*+)*\//],
      ["com", /^(?:<\!--|--\>)/],
      ["lit", /^(?:\d+|\d*\.\d+)(?:%|[a-z]+)?/i],
      ["lit", /^#[\da-f]{3,6}/i],
      ["pln", /^-?(?:[_a-z]|\\[\da-f]+ ?)(?:[\w-]|\\\\[\da-f]+ ?)*/i],
      ["pun", /^[^\s\w"']+/]
    ]
  ),
  ["css"]
);
PR.registerLangHandler(
  PR.createSimpleLexer(
    [],
    [["kwd", /^-?(?:[_a-z]|\\[\da-f]+ ?)(?:[\w-]|\\\\[\da-f]+ ?)*/i]]
  ),
  ["css-kw"]
);
PR.registerLangHandler(PR.createSimpleLexer([], [["str", /^[^"')]+/]]), [
  "css-str"
]);
