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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

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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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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Packages

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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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HTML 

              
                <h1>Heading Level One</h1>
<h2>Heading Level Two</h2>
<h3>Heading Level Three</h3>
<h4>Heading Level Four</h4>
<h5>Heading Level Five</h5>
<h6>Heading Level Six</h6>
<p>This page includes some very basic styling that might be used on any web page. Generally this should be used after a reset or normalize is applied. A reset like <a href="https://meyerweb.com/eric/tools/css/reset/"> Eric Meyer's Reset </a> will strip out all styling and force you to add everything back in.  <a href="https://necolas.github.io/normalize.css/">Normalize.css</a> is designed to keep basic spacing and alignment and make it consistent across browsers (it's not by default).</p>
<p>Currently this page is using <strong> Normalize </strong></p>
<p>You can experiment with how Reset and Normalize look by clicking on the gear icon next to CSS and changing the CSS base to normalize or reset.</p>
<p>Here are the basics of what this page does:</p>
<ul>
  <li>Set the base font-size, font-family, font-weight, line-height, color and background color on the HTML and BODY elements. </li>
  <li>Makes sure there is space between paragraphs and after list items.</li>
  <li>Sets a base font-family and font-weight for headings.</li>
  <li>Individually sets font-size, and line-height and margin for headings.</li>
  <li>Basic List styles in case a reset is used. You can leave that off if you're not using a reset.</li>
</ul> 
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Impedit neque placeat corrupti obcaecati magni. Incidunt provident, voluptas accusantium non dolore totam ab, earum, ex veritatis beatae labore delectus voluptatibus harum?</p>
 <h2>Heading Level Two</h2>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Numquam commodi iusto ut consequatur ea maiores officiis quaerat, accusamus doloribus asperiores ad facilis alias, iure, inventore quidem temporibus illo consequuntur rerum?</p>
<h3>Heading Level Three</h3>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Numquam commodi iusto ut consequatur ea maiores officiis quaerat, accusamus doloribus asperiores ad facilis alias, iure, inventore quidem temporibus illo consequuntur rerum?</p>
<h4>Heading Level Four</h4>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Numquam commodi iusto ut consequatur ea maiores officiis quaerat, accusamus doloribus asperiores ad facilis alias, iure, inventore quidem temporibus illo consequuntur rerum?</p>
<h5>Heading Level Five</h5>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Numquam commodi iusto ut consequatur ea maiores officiis quaerat, accusamus doloribus asperiores ad facilis alias, iure, inventore quidem temporibus illo consequuntur rerum?</p>
<h6>Heading Level Six</h6>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Numquam commodi iusto ut consequatur ea maiores officiis quaerat, accusamus doloribus asperiores ad facilis alias, iure, inventore quidem temporibus illo consequuntur rerum?</p>
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CSS 

              
                /* Optional, include a web font  */
@import url('https://fonts.googleapis.com/css?family=Lato:700');
@import url('https://fonts.googleapis.com/css?family=Gentium+Book+Basic:400,400i,700,700i');

/* The html and body selectors below set the base font for the entire page */
html {font-size: 1em;}

body {
  font-family: 'Gentium Book Basic', serif;
  font-weight: 400;
  line-height: 1.5;
  color: #333;
  
/*   there are other ways to do this but it's good to remember not to let text run right up to the edge of borders or color changes, images etc.' */
/*   padding: 1em; */
}

/* This adds space between paragraphs and list items
   NOTE: most Navigations use list items so you will need to 
   explicity set the margins on those so this rule doesn't 
   mess up your navigation styling */
p, li {
  margin-top: 0;
  margin-bottom: 1em;
}

/* Base Styling for headings  */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  font-family: Lato, sans-serif;
}

/* For each of your headings at minimum set the margin, size, line-height. Adjust font-weight and other properties as needed. */

h1 {
  font-size: 5.063em;
  line-height: 1;
  margin: 0 0 0.5em 0;
}

h2 {
  font-size: 3.375em;
  line-height: 1.2;
  margin: 1.5em 0 0.5em 0;
}

h3 {
  font-size: 2.25em;
  line-height: 1;
  margin: 1.5em 0 0.25em 0;
}

h4 {
  font-size: 1.5em;
  line-height: 1;
  margin: 1.5em 0 0.5em 0;
}

h5 {
  font-size: 1em;
  line-height: 1;
  margin: 1.5em 0 0.5em 0;
  
}

h6 {
  font-size: 1em;
  line-height: 1.5;
  margin: 1em 0 0 0;
  font-weight: 400; /* normal */
  text-transform: uppercase;
}
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JS
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