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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.

!
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).

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using it's URL and the proper URL extention.

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

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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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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.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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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About Packages

Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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

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HTML 

              
                <html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Technical Documentation</title>
    <link href="https://fonts.googleapis.com/css?family=Pacifico" rel="stylesheet" type="text/css">
    <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>
  </head>
  <nav id="navbar">
    <header>HTML Documentation</header>
    <ul>
    <li><a href="#Html_Introduction" class="nav-link">Html Introduction</a></li>
    <li><a href="#Code_Editors" class="nav-link">Code Editors</a></li>
    <li><a href="#The_Inline_code_element" class="nav-link">The Inline code element</a></li>
    <li><a href="#Html_Basic" class="nav-link">Html Basic</a></li>
    <li><a href="#Html_Headings" class="nav-link">Html Headings</a></li>
    </ul>
  </nav>
  <main id="main-doc">
    <section class="main-section" id="Html_Introduction">
      <header>Html Introduction</header>
      <p>HTML (HyperText Markup Language) is the most basic building block of the Web. It defines the meaning and structure of web content. Other technologies besides HTML are generally used to describe a web page's appearance/presentation (CSS) or functionality/behavior (JavaScript).</p>
      <p>"Hypertext" refers to links that connect web pages to one another, either within a single website or between websites. Links are a fundamental aspect of the Web. By uploading content to the Internet and linking it to pages created by other people, you become an active participant in the World Wide Web.
</p>
      <ul>
        <li>HTML stands for hypertext markup language</li>
        <li>HTML is the standard markup language for creating web pages</li>
        <li>HTML describes the structure of a web page</li>
        <li>HTML consists of a series of elements</li>
        <li>HTML elements tell the browser how to display the content</li>
       </ul>
    </section>
    <section class="main-section" id="Code_Editors">
      <header>Code Editors</header>
      <p>Web pages can be created and modified by using professional HTML editors.

However, for learning HTML we recommend a simple text editor like Notepad (PC) or TextEdit (Mac).</p>
      <p>We believe in that using a simple text editor is a good way to learn HTML.</p>
    </section>
    <section class="main-section" id="The_Inline_code_element">
      <header>The Inline code element</header>
      <p>The HTML <span>code</span> element displays its contents styled in a fashion intended to indicate that the text is a short fragment of computer code.</p>
      <p>The <code>push()</code> method adds one or more elements to the end of an array and returns the new length of the array.</p>
      <p>The function <code>selectAll()</code> highlights all the text in the
input field so the user can, for example, copy or delete the text.</p>
 <p>a further inline <code>
x = 5; y = 6; z = x + y; </code> element example.</p>
      <p>The HTML <code>button</code> tag defines a clickable button.</p>
      <p>The CSS <code>background-color</code> property defines the background color of an element.</p>
      
    </section>
    <section class="main-section" id="Html_Basic">
      <header>Html Basic</header>
      <h3>html documents</h3>
      <p>All HTML documents must start with a document type declaration:<span>!Doctype Html</span></p>
      <p>The HTML document itself begins with <span> html </span> and ends with <span>/html</span>.</p>
    </section>
    <section class="main-section" id="Html_Headings">
      <header>Html Headings</header>
      <p>HTML headings are defined with the <span>h1</span> to <span>h6</span> tags.</p>
      <p><span>h1</span>defines the most important heading. <span>h6</span> defines the least important heading: </p>
    </section>
  </main>
!

CSS 

              
                body{
  background:#fff7e6;
}

#navbar {
  float:left;
  width:200px;
  margin:0;
  padding:10px;
}

#navbar header{
  text-align:center;
  border-bottom: 1px solid;
  width:235px;
  margin-left:-44px;
}

#navbar ul{
  height:100%;  
}

#navbar li{
  list-style-type:none;
  border-bottom:1px solid;
  padding-bottom:20px;
  width:210px;
  margin-left:-60px;
}

#navbar a {
  display: block;
  text-decoration:none;
  text-align:center;
  color: rgba(0, 22, 22, 0.4);
  width:160px;
  padding:10px;
}

header{
  font-size: 1.8em;
  font-weight:thin;  
}

#main-doc{
  margin-left:200px;
  padding:10px;
  border-left:solid;
}

span{
  font-style:italic;
}

code {
  display: block;
  text-align: left;
  white-space: pre-line;
  position: relative;
  word-break: normal;
  word-wrap: normal;
  line-height: 2;
  background-color: #f7f7f7;
  padding: 15px;
  margin: 10px;
  border-radius: 5px;
}

/* smartphones, iPhone, portrait 480x320 phones */
  @media only screen and (min-width:320px) and (max-width:480px){
        #navbar{
            width:40%;
        }

        #navbar header{
            font-size:1em;
            font-weight:100;
            width:156px;
        }

        #navbar li{
            width:130px;
        }

        #navbar a{
            width:120px;
            padding:2px;
        }

        #main-doc{
            margin-left:120px;
        }
  }

/* big landscape tablets, laptops, and desktops */
  @media only screen and (min-width:961px) and (max-width:1025px){

        #navbar a{
            font-size:1.4em;
            padding:20px;
        }

        #main-doc{
            font-size:1.4em;
        }
  }
!

JS 

              
                // !! IMPORTANT README:

// You may add additional external JS and CSS as needed to complete the project, however the current external resource MUST remain in place for the tests to work. BABEL must also be left in place. 

/***********
INSTRUCTIONS:
  - Select the project you would 
    like to complete from the dropdown 
    menu.
  - Click the "RUN TESTS" button to
    run the tests against the blank 
    pen.
  - Click the "TESTS" button to see 
    the individual test cases. 
    (should all be failing at first)
  - Start coding! As you fulfill each
    test case, you will see them go   
    from red to green.
  - As you start to build out your 
    project, when tests are failing, 
    you should get helpful errors 
    along the way!
    ************/

// PLEASE NOTE: Adding global style rules using the * selector, or by adding rules to body {..} or html {..}, or to all elements within body or html, i.e. h1 {..}, has the potential to pollute the test suite's CSS. Try adding: * { color: red }, for a quick example!

// Once you have read the above messages, you can delete all comments.
!
999px

Console