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HTML

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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.

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Babel includes JSX processing.

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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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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <!-- 通常の表（横） -->
<div class="horizontal">
  <table>
    <thead>
      <tr>
        <th></th><th>列見出し1</th><th>列見出し2</th><th>列見出し3</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <th>行見出し1</th><td>セル1</td><td>セル2</td><td>セル3</td>
      </tr>
      <tr>
        <th>行見出し2</th><td>セル4</td><td>セル5</td><td>セル6</td>
      </tr>
    </tbody>
  </table>
</div>

<!-- 縦書きを指定した表 -->
<div class="vertical">
  <table>
    <thead>
      <tr>
        <th></th><th>列見出し1</th><th>列見出し2</th><th>列見出し3</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <th>行見出し1</th><td>セル1</td><td>セル2</td><td>セル3</td>
      </tr>
      <tr>
        <th>行見出し2</th><td>セル4</td><td>セル5</td><td>セル6</td>
      </tr>
    </tbody>
  </table>
</div>
!

CSS 

              
                .horizontal {
  display: inline-block;
  margin: 10px;
}
.vertical{
  display: inline-block;
  -webkit-writing-mode: vertical-rl;
      -ms-writing-mode: tb-rl;
          writing-mode: vertical-rl; /* 縦書きにする */
  text-orientation: upright; /* 横文字を正立させる(IE,Edge非対応) */
  margin: 10px;
}


/* 表のCSS */
thead tr th {
  background-color: rgb(91,189,206);
  color: #fff;
}
tbody {
  background-color: rgb(213,255,236);  
}
th {
  background-color: rgb(255,196,226);
  padding: 10px;
  text-align: center; 
}
td {
  padding: 10px;
  text-align: center;
}
!

JS
!
999px

Console