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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).

Add External Stylesheets/Pens

Any URLs 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 its URL and the proper URL extension.

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About External Resources

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.

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

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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.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

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 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.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

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HTML 

              
                <header class="site-header">
  <div class="max-width">
    <h1 class="heading__primary">Glossary of Terms</h1>

    <nav class="toggle-nav">
      <a href="#" data-toggle="all" class="active">All</a>
      <a href="#" data-toggle="content">Content</a>
      <a href="#" data-toggle="html">HTML</a>
      <a href="#" data-toggle="design">Design</a>
      <a href="#" data-toggle="css">CSS</a>
    </nav>
    
    <button id="printButton">Print</button>
  </div>
</header>

<main class="site-content">
  <article class="content-section" id="content">
    <header class="content-section__header">
      <div class="max-width">
        <h1 class="heading__tertiary">Content</h1>
      </div>
    </header>
    <div class="max-width">
      <dl>
        <dt>Content</dt>
        <dd>All the things you want to communicate to your website visitors, including headlines, paragraphs, pictures, and links.</dd>

        <dt>Topic</dt>
        <dd>What your website is about.</dd>

        <dt>Goal</dt>
        <dd>What you hope users will get out of visiting your website. </dd>
      </dl>
    </div>
  </article>
<main class="site-content">
  <article class="content-section" id="html">
    <header class="content-section__header">
      <div class="max-width">
        <h1 class="heading__tertiary">HTML</h1>
      </div>
    </header>
    <div class="max-width">
      <dl>
        <dt>Attribute</dt>
        <dd>Code that adds more information about an html element, usually in a property/value pair, where the “property” is the kind of information and the “value” is what the information is. Attributes are specified in the opening tag.</dd>

        <dt>Block Element</dt>
        <dd>An element that lives on its own line, sometimes with space automatically added, such as &lt;p&gt; or &lt;div&gt;. <a href="http://learnlayout.com/display.html" target="_blank">Learn more about layouts</a>.</dd>

        <dt>Closing Tag</dt>
        <dd>The tag at the end of a container element, also called an “end tag”. Usually includes a “/” before the coded letter inside the angle brackets. </dd>

        <dt>Container Element</dt>
        <dd>A type of html tag that has both an opening and closing tag.</dd>

        <dt>Element</dt>
        <dd>Usually consists of a start tag and end tag, along with the content between the tags.</dd>

        <dt>HTML</dt>
        <dd>Hyper Text Markup Language</dd>

        <dt>Inline Element</dt>
        <dd>An element that lives on the line with other elements, such as &lt;img /&gt; or &lt;span&gt;. <a href="http://learnlayout.com/display.html" target="_blank">Learn more about layouts</a>.</dd>

        <dt>Opening Tag</dt>
        <dd>The tag at the beginning of a container element, also called a “start tag”.</dd>

        <dt>Self-closing Tag</dt>
        <dd>A tag with no content and therefore no closing tag, like &lt; img /&gt; or &lt; hr /&gt;.</dd>

        <dt>Tag</dt>
        <dd>A coded letter between a set of angle brackets, &lt; &gt;, used as the base of HTML language.</dd>
      </dl>
    </div>
  </article>
  <article class="content-section" id="design">
    <header class="content-section__header">
      <div class="max-width">
        <h1 class="heading__tertiary">Design</h1>
      </div>
    </header>
    <div class="max-width">
      <dl>
        <dt>Display Face</dt>
        <dd>Fancy fonts designed to be used only at large sizes, such as titles and headings. </dd>

        <dt>Font</dt>
        <dd>A set of type (letters) of one particular style and size. </dd>

        <dt>Mood</dt>
        <dd>A feeling or emotion, or set of emotions, a designer wishes the audience to feel. </dd>

        <dt>Sans-serif</dt>
        <dd>A font without serifs; font lacking the “little feet”. </dd>

        <dt>Serif</dt>
        <dd>A font with lines at the top and/or bottom of the long parts of letters; font with “little feet”. </dd>
        <dt>Typography</dt>
        <dd>The style and appearance of printed text. </dd>
      </dl>
    </div>
  </article>
  <article class="content-section" id="css">
    <header class="content-section__header">
      <div class="max-width">
        <h1 class="heading__tertiary">CSS</h1>
      </div>
    </header>
    <div class="max-width">
      <dl>
        <dt>Cascade</dt>
        <dd>The defined order of precedence (importance) in CSS. </dd>

        <dt>Class Selector</dt>
        <dd>A CSS rule applied only to specific classes; Class selectors begin with a period, for example: “.class_name {}”. </dd>

        <dt>CSS</dt>
        <dd>Cascading Style Sheets</dd>

        <dt>Element Selector</dt>
        <dd>A CSS rule applied only all html elements of a single type; element selectors are the name of the element, for example: “body {}”. </dd>

        <dt>ID Selector</dt>
        <dd>A CSS rule applied only to a single ID; ID selectors begin with a number symbol, for example: “#ID_name {}”. </dd>

        <dt>Property</dt>
        <dd>The part of a CSS rule that identifies what part of the selector you what to style, such as “background-color” or “font-size”. </dd>

        <dt>Pseudo Selector</dt>
        <dd>A keyword added to selectors to identify only a specific state, such as “:hover” or “:active”. </dd>

        <dt>Reset Stylesheet</dt>
        <dd>A type of CSS stylesheet that removes all default styles and “resets” them to a baseline. </dd>

        <dt>Rule</dt>
        <dd>A CSS rule is made up of a selector and at least one property/value pair. </dd>

        <dt>Selector</dt>
        <dd>The part of a CSS rule that actually selects the content you want to style, such as a class or ID. </dd>
        <dt>Value</dt>
        <dd>The part of a CSS rule that tells a property how to behave, such as setting the font size to “200%”, or the background color to “blue”. “Blue” and “200%” are both potential values. </dd>
      </dl>
    </div>
  </article>
</main>

<footer class="site-footer">
  <div class="max-width">
    <p>&copy; 2018 <a href="https://buildingwebsites.seesparkbox.com/" target="_blank">Building Websites Workshop</a>.</p>
  </div>
</footer>
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