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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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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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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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Packages

Add Packages

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HTML 

              
                <!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://unpkg.com/missing.css/dist/missing.min.css" />
    <title>HTML5 Test Page</title>
  </head>
  <body>
    <div id="top" role="document">
      <header>
        <h1>HTML5 Test Page</h1>
        <p>This is a test page filled with common HTML elements to be used to provide visual feedback whilst building CSS systems and frameworks.</p>
      </header>
      <nav>
        <ul>
          <li>
            <a href="#text">Text</a>
            <ul>
              <li><a href="#text__headings">Headings</a></li>
              <li><a href="#text__paragraphs">Paragraphs</a></li>
              <li><a href="#text__lists">Lists</a></li>
              <li><a href="#text__blockquotes">Blockquotes</a></li>
              <li><a href="#text__details">Details / Summary</a></li>
              <li><a href="#text__address">Address</a></li>
              <li><a href="#text__hr">Horizontal rules</a></li>
              <li><a href="#text__tables">Tabular data</a></li>
              <li><a href="#text__code">Code</a></li>
              <li><a href="#text__inline">Inline elements</a></li>
              <li><a href="#text__comments">HTML Comments</a></li>
            </ul>
          </li>
          <li>
            <a href="#embedded">Embedded content</a>
            <ul>
              <li><a href="#embedded__images">Images</a></li>
              <li><a href="#embedded__bgimages">Background images</a></li>
              <li><a href="#embedded__audio">Audio</a></li>
              <li><a href="#embedded__video">Video</a></li>
              <li><a href="#embedded__canvas">Canvas</a></li>
              <li><a href="#embedded__meter">Meter</a></li>
              <li><a href="#embedded__progress">Progress</a></li>
              <li><a href="#embedded__svg">Inline SVG</a></li>
              <li><a href="#embedded__iframe">IFrames</a></li>
              <li><a href="#embedded__embed">Embed</a></li>
              <li><a href="#embedded__object">Object</a></li>
            </ul>
          </li>
          <li>
            <a href="#forms">Form elements</a>
            <ul>
              <li><a href="#forms__input">Input fields</a></li>
              <li><a href="#forms__select">Select menus</a></li>
              <li><a href="#forms__checkbox">Checkboxes</a></li>
              <li><a href="#forms__radio">Radio buttons</a></li>
              <li><a href="#forms__textareas">Textareas</a></li>
              <li><a href="#forms__html5">HTML5 inputs</a></li>
              <li><a href="#forms__action">Action buttons</a></li>
            </ul>
          </li>
        </ul>
      </nav>
      <main>
        <section id="text">
          <header><h1>Text</h1></header>
          <article id="text__headings">
            <header>
              <h2>Headings</h2>
            </header>
            <div>
              <h1>Heading 1</h1>
              <h2>Heading 2</h2>
              <h3>Heading 3</h3>
              <h4>Heading 4</h4>
              <h5>Heading 5</h5>
              <h6>Heading 6</h6>
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__paragraphs">
            <header><h2>Paragraphs</h2></header>
            <div>
              <p>A paragraph (from the Greek paragraphos, “to write beside” or “written beside”) is a self-contained unit of a discourse in writing dealing with a particular point or idea. A paragraph consists of one or more sentences. Though not required by the syntax of any language, paragraphs are usually an expected part of formal writing, used to organize longer prose.</p>
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__blockquotes">
            <header><h2>Blockquotes</h2></header>
            <div>
              <blockquote>
                <p>A block quotation (also known as a long quotation or extract) is a quotation in a written document, that is set off from the main text as a paragraph, or block of text.</p>
                <p>It is typically distinguished visually using indentation and a different typeface or smaller size quotation. It may or may not include a citation, usually placed at the bottom.</p>
                <cite><a href="#!">Said no one, ever.</a></cite>
              </blockquote>
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__lists">
            <header><h2>Lists</h2></header>
            <div>
              <h3>Definition list</h3>
              <dl>
                <dt>Definition List Title</dt>
                <dd>This is a definition list division.</dd>
              </dl>
              <h3>Ordered List</h3>
              <ol type="1">
                <li>List Item 1</li>
                <li>
                  List Item 2
                  <ol type="A">
                    <li>List Item 1</li>
                    <li>
                      List Item 2
                      <ol type="a">
                        <li>List Item 1</li>
                        <li>
                          List Item 2
                          <ol type="I">
                            <li>List Item 1</li>
                            <li>
                              List Item 2
                              <ol type="i">
                                <li>List Item 1</li>
                                <li>List Item 2</li>
                                <li>List Item 3</li>
                              </ol>
                            </li>
                            <li>List Item 3</li>
                          </ol>
                        </li>
                        <li>List Item 3</li>
                      </ol>
                    </li>
                    <li>List Item 3</li>
                  </ol>
                </li>
                <li>List Item 3</li>
              </ol>
              <h3>Unordered List</h3>
              <ul>
                <li>List Item 1</li>
                <li>
                  List Item 2
                  <ul>
                    <li>List Item 1</li>
                    <li>
                      List Item 2
                      <ul>
                        <li>List Item 1</li>
                        <li>
                          List Item 2
                          <ul>
                            <li>List Item 1</li>
                            <li>
                              List Item 2
                              <ul>
                                <li>List Item 1</li>
                                <li>List Item 2</li>
                                <li>List Item 3</li>
                              </ul>
                            </li>
                            <li>List Item 3</li>
                          </ul>
                        </li>
                        <li>List Item 3</li>
                      </ul>
                    </li>
                    <li>List Item 3</li>
                  </ul>
                </li>
                <li>List Item 3</li>
              </ul>
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__blockquotes">
            <header><h1>Blockquotes</h1></header>
            <div>
              <blockquote>
                <p>A block quotation (also known as a long quotation or extract) is a quotation in a written document, that is set off from the main text as a paragraph, or block of text.</p>
                <p>It is typically distinguished visually using indentation and a different typeface or smaller size quotation. It may or may not include a citation, usually placed at the bottom.</p>
                <cite><a href="#!">Said no one, ever.</a></cite>
              </blockquote>
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__details">
            <header><h1>Details / Summary</h1></header>
            <details>
              <summary>Expand for details</summary>
              <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Cum, odio! Odio natus ullam ad quaerat, eaque necessitatibus, aliquid distinctio similique voluptatibus dicta consequuntur animi. Quaerat facilis quidem unde eos! Ipsa.</p>
            </details>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__address">
            <header><h1>Address</h1></header>
            <address>
              Written by <a href="mailto:webmaster@example.com">Jon Doe</a>.<br>
              Visit us at:<br>
              Example.com<br>
              Box 564, Disneyland<br>
              USA
            </address>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__hr">
            <header><h2>Horizontal rules</h2></header>
            <div>
              <hr>
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__tables">
            <header><h2>Tabular data</h2></header>
            <table>
              <caption>Table Caption</caption>
              <thead>
                <tr>
                  <th>Table Heading 1</th>
                  <th>Table Heading 2</th>
                  <th>Table Heading 3</th>
                  <th>Table Heading 4</th>
                  <th>Table Heading 5</th>
                </tr>
              </thead>
              <tfoot>
                <tr>
                  <th>Table Footer 1</th>
                  <th>Table Footer 2</th>
                  <th>Table Footer 3</th>
                  <th>Table Footer 4</th>
                  <th>Table Footer 5</th>
                </tr>
              </tfoot>
              <tbody>
                <tr>
                  <td>Table Cell 1</td>
                  <td>Table Cell 2</td>
                  <td>Table Cell 3</td>
                  <td>Table Cell 4</td>
                  <td>Table Cell 5</td>
                </tr>
                <tr>
                  <td>Table Cell 1</td>
                  <td>Table Cell 2</td>
                  <td>Table Cell 3</td>
                  <td>Table Cell 4</td>
                  <td>Table Cell 5</td>
                </tr>
                <tr>
                  <td>Table Cell 1</td>
                  <td>Table Cell 2</td>
                  <td>Table Cell 3</td>
                  <td>Table Cell 4</td>
                  <td>Table Cell 5</td>
                </tr>
                <tr>
                  <td>Table Cell 1</td>
                  <td>Table Cell 2</td>
                  <td>Table Cell 3</td>
                  <td>Table Cell 4</td>
                  <td>Table Cell 5</td>
                </tr>
              </tbody>
            </table>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__code">
            <header><h2>Code</h2></header>
            <div>
              <p><strong>Keyboard input:</strong> <kbd>Cmd</kbd></p>
              <p><strong>Inline code:</strong> <code>&lt;div&gt;code&lt;/div&gt;</code></p>
              <p><strong>Sample output:</strong> <samp>This is sample output from a computer program.</samp></p>
              <h2>Pre-formatted text</h2>
              <pre>P R E F O R M A T T E D T E X T
  ! " # $ % &amp; ' ( ) * + , - . /
  0 1 2 3 4 5 6 7 8 9 : ; &lt; = &gt; ?
  @ A B C D E F G H I J K L M N O
  P Q R S T U V W X Y Z [ \ ] ^ _
  ` a b c d e f g h i j k l m n o
  p q r s t u v w x y z { | } ~ </pre>
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__inline">
            <header><h2>Inline elements</h2></header>
            <div>
              <p><a href="#!">This is a text link</a>.</p>
              <p><strong>Strong is used to indicate strong importance.</strong></p>
              <p><em>This text has added emphasis.</em></p>
              <p>The <b>b element</b> is stylistically different text from normal text, without any special importance.</p>
              <p>The <i>i element</i> is text that is offset from the normal text.</p>
              <p>The <u>u element</u> is text with an unarticulated, though explicitly rendered, non-textual annotation.</p>
              <p><del>This text is deleted</del> and <ins>This text is inserted</ins>.</p>
              <p><s>This text has a strikethrough</s>.</p>
              <p>Superscript<sup>®</sup>.</p>
              <p>Subscript for things like H<sub>2</sub>O.</p>
              <p><small>This small text is small for fine print, etc.</small></p>
              <p>Abbreviation: <abbr title="HyperText Markup Language">HTML</abbr></p>
              <p><q cite="https://developer.mozilla.org/en-US/docs/HTML/Element/q">This text is a short inline quotation.</q></p>
              <p><cite>This is a citation.</cite></p>
              <p>The <dfn>dfn element</dfn> indicates a definition.</p>
              <p>The <mark>mark element</mark> indicates a highlight.</p>
              <p>The <var>variable element</var>, such as <var>x</var> = <var>y</var>.</p>
              <p>The time element: <time datetime="2013-04-06T12:32+00:00">2 weeks ago</time></p>
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="text__comments">
            <header><h2>HTML Comments</h2></header>
            <div>
              <p>There is comment here: <!--This comment should not be displayed--></p>
              <p>There is a comment spanning multiple tags and lines below here.</p>
              <!--<p><a href="#!">This is a text link. But it should not be displayed in a comment</a>.</p>
              <p><strong>Strong is used to indicate strong importance. But, it should not be displayed in a comment</strong></p>
              <p><em>This text has added emphasis. But, it should not be displayed in a comment</em></p>-->
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
        </section>
        <section id="embedded">
          <header><h2>Embedded content</h2></header>
          <article id="embedded__images">
            <header><h2>Images</h2></header>
            <div>
              <h3>Plain <code>&lt;img&gt;</code> element</h3>
              <p><img src="https://placekitten.com/480/480" alt="Photo of a kitten"></p>
              <h3><code>&lt;figure&gt;</code> element with <code>&lt;img&gt;</code> element</h3>
              <figure><img src="https://placekitten.com/420/420" alt="Photo of a kitten"></figure>
              <h3><code>&lt;figure&gt;</code> element with <code>&lt;img&gt;</code> and <code>&lt;figcaption&gt;</code> elements</h3>
              <figure>
                <img src="https://placekitten.com/420/420" alt="Photo of a kitten">
                <figcaption>Here is a caption for this image.</figcaption>
              </figure>
              <h3><code>&lt;figure&gt;</code> element with a <code>&lt;picture&gt;</code> element</h3>
              <figure>
                <picture>
                  <source srcset="https://placekitten.com/800/800"
                    media="(min-width: 800px)">
                  <img src="https://placekitten.com/420/420" alt="Photo of a kitten" />
                </picture>
              </figure>
            </div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__bgimages">
            <header><h2>Background images</h2></header>
            <div style="background-image:url('https://placekitten.com/300/300'); width:300px; height: 300px;"></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__audio">
            <header><h2>Audio</h2></header>
            <div><audio controls="">audio</audio></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__video">
            <header><h2>Video</h2></header>
            <div><video controls="">video</video></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__canvas">
            <header><h2>Canvas</h2></header>
            <div><canvas>canvas</canvas></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__meter">
            <header><h2>Meter</h2></header>
            <div><meter value="2" min="0" max="10">2 out of 10</meter></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__progress">
            <header><h2>Progress</h2></header>
            <div><progress>progress</progress></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__svg">
            <header><h2>Inline SVG</h2></header>
            <div><svg width="100px" height="100px"><circle cx="100" cy="100" r="100" fill="#1fa3ec"></circle></svg></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__iframe">
            <header><h2>IFrame</h2></header>
            <div><iframe src="index.html" height="300"></iframe></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__embed">
            <header><h2>Embed</h2></header>
            <div><embed src="index.html" height="300"></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
          <article id="embedded__object">
            <header><h2>Object</h2></header>
            <div><object data="index.html" height="300"></object></div>
            <footer><p><a href="#top">[Top]</a></p></footer>
          </article>
        </section>
        <section id="forms">
          <header><h2>Form elements</h2></header>
          <form>
            <fieldset id="forms__input">
              <legend>Input fields</legend>
              <p>
                <label for="input__text">Text Input</label>
                <input id="input__text" type="text" placeholder="Text Input">
              </p>
              <p>
                <label for="input__password">Password</label>
                <input id="input__password" type="password" placeholder="Type your Password">
              </p>
              <p>
                <label for="input__webaddress">Web Address</label>
                <input id="input__webaddress" type="url" placeholder="https://yoursite.com">
              </p>
              <p>
                <label for="input__emailaddress">Email Address</label>
                <input id="input__emailaddress" type="email" placeholder="name@email.com">
              </p>
              <p>
                <label for="input__phone">Phone Number</label>
                <input id="input__phone" type="tel" placeholder="(999) 999-9999">
              </p>
              <p>
                <label for="input__search">Search</label>
                <input id="input__search" type="search" placeholder="Enter Search Term">
              </p>
              <p>
                <label for="input__text2">Number Input</label>
                <input id="input__text2" type="number" placeholder="Enter a Number">
              </p>
              <p>
                <label for="input__file">File Input</label>
                <input id="input__file" type="file">
              </p>
            </fieldset>
            <p><a href="#top">[Top]</a></p>
            <fieldset id="forms__select">
              <legend>Select menus</legend>
              <p>
                <label for="select">Select</label>
                <select id="select">
                  <optgroup label="Option Group">
                    <option>Option One</option>
                    <option>Option Two</option>
                    <option>Option Three</option>
                  </optgroup>
                </select>
              </p>
              <p>
                <label for="select_multiple">Select (multiple)</label>
                <select id="select_multiple" multiple="multiple">
                  <optgroup label="Option Group">
                    <option>Option One</option>
                    <option>Option Two</option>
                    <option>Option Three</option>
                  </optgroup>
                </select>
              </p>
            </fieldset>
            <p><a href="#top">[Top]</a></p>
            <fieldset id="forms__checkbox">
              <legend>Checkboxes</legend>
              <ul>
                <li><label for="checkbox1"><input id="checkbox1" name="checkbox" type="checkbox" checked="checked"> Choice A</label></li>
                <li><label for="checkbox2"><input id="checkbox2" name="checkbox" type="checkbox"> Choice B</label></li>
                <li><label for="checkbox3"><input id="checkbox3" name="checkbox" type="checkbox"> Choice C</label></li>
              </ul>
            </fieldset>
            <p><a href="#top">[Top]</a></p>
            <fieldset id="forms__radio">
              <legend>Radio buttons</legend>
              <ul>
                <li><label for="radio1"><input id="radio1" name="radio" type="radio" checked="checked"> Option 1</label></li>
                <li><label for="radio2"><input id="radio2" name="radio" type="radio"> Option 2</label></li>
                <li><label for="radio3"><input id="radio3" name="radio" type="radio"> Option 3</label></li>
              </ul>
            </fieldset>
            <p><a href="#top">[Top]</a></p>
            <fieldset id="forms__textareas">
              <legend>Textareas</legend>
              <p>
                <label for="textarea">Textarea</label>
                <textarea id="textarea" rows="8" cols="48" placeholder="Enter your message here"></textarea>
              </p>
            </fieldset>
            <p><a href="#top">[Top]</a></p>
            <fieldset id="forms__html5">
              <legend>HTML5 inputs</legend>
              <p>
                <label for="ic">Color input</label>
                <input type="color" id="ic" value="#000000">
              </p>
              <p>
                <label for="in">Number input</label>
                <input type="number" id="in" min="0" max="10" value="5">
              </p>
              <p>
                <label for="ir">Range input</label>
                <input type="range" id="ir" value="10">
              </p>
              <p>
                <label for="idd">Date input</label>
                <input type="date" id="idd" value="1970-01-01">
              </p>
              <p>
                <label for="idm">Month input</label>
                <input type="month" id="idm" value="1970-01">
              </p>
              <p>
                <label for="idw">Week input</label>
                <input type="week" id="idw" value="1970-W01">
              </p>
              <p>
                <label for="idt">Datetime input</label>
                <input type="datetime" id="idt" value="1970-01-01T00:00:00Z">
              </p>
              <p>
                <label for="idtl">Datetime-local input</label>
                <input type="datetime-local" id="idtl" value="1970-01-01T00:00">
              </p>
              <p>
                <label for="idl">Datalist</label>
                <input type="text" id="idl" list="example-list">
                <datalist id="example-list">
                  <option value="Example #1" />
                  <option value="Example #2" />
                  <option value="Example #3" />
                </datalist>
              </p>
            </fieldset>
            <p><a href="#top">[Top]</a></p>
            <fieldset id="forms__action">
              <legend>Action buttons</legend>
              <p>
                <input type="submit" value="<input type=submit>">
                <input type="button" value="<input type=button>">
                <input type="reset" value="<input type=reset>">
                <input type="submit" value="<input disabled>" disabled>
              </p>
              <p>
                <button type="submit">&lt;button type=submit&gt;</button>
                <button type="button">&lt;button type=button&gt;</button>
                <button type="reset">&lt;button type=reset&gt;</button>
                <button type="button" disabled>&lt;button disabled&gt;</button>
              </p>
            </fieldset>
            <p><a href="#top">[Top]</a></p>
          </form>
        </section>
      </main>
      <footer>
        <p>Made by <a href="http://twitter.com/cbracco">@cbracco</a>. Code on <a href="http://github.com/cbracco/html5-test-page">GitHub</a>.</p>
      </footer>
    </div>
  </body>
</html>
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