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HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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HTML 

              
                <ul class="table-of-contents">
  <li><a href="#イギリスのワーホリ留学について">イギリスのワーホリ・留学について</a>
    <ul>
      <li><a href="#基礎知識">基礎知識</a></li>
    </ul>
  </li>
  <li><a href="#出国前にやること手順">出国前にやること・手順</a>
    <ul>
      <li><a href="#YMSワーホリビザ申請手順">YMS・ワーホリビザ申請手順</a></li>
      <li><a href="#日本でやること">日本でやること</a>
        <ul>
          <li><a href="#豆知識">豆知識</a></li>
        </ul>
      </li>
      <li><a href="#準備">準備</a></li>
      <li><a href="#持ち物">持ち物</a></li>
      <li><a href="#保険">保険</a></li>
      <li><a href="#お金">お金</a></li>
      <li><a href="#渡英後にやること">渡英後にやること</a></li>
    </ul>
  </li>
  <li><a href="#イギリス生活の豆知識">イギリス生活の豆知識</a>
    <ul>
      <li><a href="#住宅">住宅</a></li>
      <li><a href="#学校">学校</a></li>
      <li><a href="#仕事">仕事</a></li>
      <li><a href="#美容">美容</a></li>
      <li><a href="#健康">健康</a></li>
      <li><a href="#英語">英語</a></li>
      <li><a href="#気づいたこと暮らしのこと">気づいたこと・暮らしのこと</a></li>
      <li><a href="#ふりかえり">ふりかえり</a></li>
    </ul>
  </li>
  <li><a href="#イギリス旅行ガイド">イギリス旅行ガイド</a>
    <ul>
      <li><a href="#スコットランド">スコットランド</a></li>
      <li><a href="#イングランド">イングランド</a></li>
      <li><a href="#北イングランド">北イングランド</a></li>
      <li><a href="#南イングランド">南イングランド</a></li>
    </ul>
  </li>
  <li><a href="#ヨーロッパ旅行ガイド">ヨーロッパ旅行ガイド</a>
    <ul>
      <li><a href="#ドイツ">ドイツ</a></li>
      <li><a href="#オランダ">オランダ</a></li>
      <li><a href="#ベルギー">ベルギー</a></li>
      <li><a href="#フランス">フランス</a></li>
      <li><a href="#スウェーデン">スウェーデン</a></li>
      <li><a href="#デンマーク">デンマーク</a></li>
      <li><a href="#フィンランド">フィンランド</a></li>
      <li><a href="#エストニア">エストニア</a></li>
      <li><a href="#ノルウェー">ノルウェー</a></li>
    </ul>
  </li>
  <li><a href="#叶えたい100のこと">叶えたい100のこと</a></li>
</ul>
!

CSS 

              
                /*--------------------------------------
  もくじ
--------------------------------------*/
ul.table-of-contents {
  font-size: 12px !important;/*文字サイズ*/
  border: 1px solid #eee !important;
  padding: 1em 1.5em 1em 2.25em !important;
  color: #999 !important;
  display: inline-block;
}
ul.table-of-contents:before {
  content: "[  も く じ  ]"; /* お好きな文言に変更してください */
  display: inline-block;
  margin: 0.2em 0em 1em;
  padding: 0.2em 1em;
  font-weight: bold;
  background-color: #f5f5f5;
}
ul.table-of-contents a:after {
  display: none !important;
}
ul.table-of-contents li a,
ul.table-of-contents li a:visited {
  color: #999 !important; /* リンク文字の色 */
  text-decoration: none; /* リンクの下線あり・なし */
}
ul.table-of-contents li a:hover {
  color: #bac !important; /* リンクにマウスを重ねた時の色 */
}
ul.table-of-contents li {
  margin: 5px 0 10px 10px !important;
  line-height: 1.5;
  padding: 0;
  list-style-type: none !important;
}
ul.table-of-contents li:before {
  content: "▼"; /*お好きな記号に変更可能です*/
  position: absolute;
  left: 1.7em !important; /*左端からのアイコンまでの距離*/
  color: #fac;
}
ul.table-of-contents ul li,
ul.table-of-contents li ul {
  /* H1のみ表示させる */
  display: none !important;
}
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JS
!
999px

Console