Real World Haskell の HTML 中に節番号振るヤツ

section_numbers_for_real_world_haskell.user.js

// ==UserScript==
// @name           section_numbers_for_real_world_haskell.js
// @namespace      http://yuyat.jp/
// @description    Gives section numbers for Real World Haskell book online.
// @include        http://book.realworldhaskell.org/read/*
// ==/UserScript==

(function () {
  Array.forEach(document.getElementsByClassName('title'), function (e,i) {
    if (i > 0) {
      e.innerHTML = i + ". " + e.innerHTML;
    }
  });
})();