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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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HTML 

              
                <div class="bg-dark">
  <div class="content-width no-flex-container">

    <a href="#skip-link-target" id="skip-link" class="text-assistive">Skip to main content.</a>

    <div class="branding"><a href="#">Style Magic</a></div>
      <div role="navigation" aria-label="Main menu" class="menu with-branding">
        <a href="#">Home</a>
        <a href="#">CSS</a>
        <a href="#">HTML</a>
        <a href="#">JS</a>
        <a href="#">Opinion</a>
        <a href="#">Inspiration</a>
        <a href="#">Contact</a>
      </div>
  </div>
</div>

<div class="hero content-width">
  <img src="https://placeimg.com/1000/200/tech/grayscale" alt="" />
</div>

<a href="#skip-link-target" class="text-assistive display-at-top-on-focus" id="skip-link-target">Start of main content.</a>

<div role="main" class="content-width">

  <h1>Skip To Content Demo – Old Browser Support</h1>
  
  <p>An extension of the technique from our demo for our <a href="https://css-tricks.com/a-deep-dive-on-skipping-to-content/">skip to content article</a> on CSS-Tricks which demonstrates semantic markup, improved keyboard focus visibility and a skip link that works with older browsers. This technique should work for almost everyone unless you are a big fan of IE6 and below (and if you are then check out <a href="https://www.refinedpractice.com/examples/skiplink-redux-archived.html">this article from 2009</a>). It looks a little different as we've also removed other new-browser-only CSS such as <code>flex</code>, <code>rem</code> and <code>object-fit</code>.</p>

  <p>Hero image from <a href="https://placeimg.com/" >PlaceIMG</a>.</p>
  
    <p>If (like me) you are curious as to how this works on IE7 then you will need to use this <a href="http://nossl.rpress.io/skip-to-content/skip-to-content-old-browser-support.html" target="_blank">non-ssl version</a> of the demo.</p>


  <h2>Want to test with a screenreader?</h2>
  <p>If you want to test this code with a screenreader like <a href="https://www.nvaccess.org/">NVDA</a> you will find it easier to use the <a href="https://rpress.io/examples/skip-to-content/skip-to-content-old-browser-support.html" target="_blank">static version in a new tab</a>.</p>
</div>

<div class="bg-dark">
  <div class="content-width no-flex-container">
    <div role="navigation" aria-label="Utility menu" class="menu">
      <a href="#">Privacy</a>
      <a href="#">Terms &amp; Conditions</a>
    </div>
</div>
!

CSS 

              
                /* Skip link styling */
.text-assistive {
  display: block;
  position: absolute;
  top: 0;
  left: -200%;
  width: 1%;
  margin: 0;
  padding: 0;
  z-index: 0;
}
.text-assistive:focus, .text-assistive:active {
  z-index: 999;
  width: 100%;
  left: 0;
  height: 80px;
  line-height: 80px;
  background: white;
  font-size: 1.2em;
  text-decoration: none;
  color: #1295e6;
  text-align: center;
}
#skip-link-target:focus {
  background: #084367;
  color: white;
}
/* end of skip link styling */

/* improved keyboard focus visibility */
a:focus, a:active {
  border-bottom-color: #1295e6;
}
.menu a:focus, .branding a:focus, .menu a:active, .branding a:active {
  background-color: white;
  color: #1295e6;
}
/* end of improved keyboard focus visibility */


/* basic styles for the rest of the page */
body {
  font-family: sans-serif;
  font-size: 20px;
  margin: 0;
  padding: 0;
}
.bg-dark {
  background: #1295e6;
  color: #fff; 
  min-height: 100px;
}
.content-width {
  max-width: 1176px;
  padding: 20px;
  margin: 0 auto;
}
a {
  text-decoration: none;
  color: #1295e6;
  border-bottom: 4px solid transparent;
}
a:hover, a:active {
  border-bottom-color: #1295e6;
}
.menu a, .branding a {
  color: white;
}
.menu a:hover, .branding a:hover {
  background-color: white;
  color: #1295e6;
}
.branding {
  display: block;
  align-items: center;
  width: 220px;
  font-size: 1.75em;
  font-style: italic;
  height: 68px;
  line-height: 68px;
  float: left;
}
.branding a {
  padding: 0 0.5em;
}
.no-flex-container {
  text-align: center;
}
.menu {
  display: block;
  height: 68px;
}
.menu a {
  display: block;
  float: left;
  height: 68px;
  line-height: 68px;
  padding: 0 1em;
}
.hero {
  width: 100%;
  height: 200px;
}
.hero img {
  width: 100%;
  height: 100%;
}
/* end of basic styles for the rest of the page */
!

JS 

              
                 var target = document.getElementById('skip-link-target');
 document.getElementById('skip-link').setAttribute("onclick" , "document.getElementById('skip-link-target').focus();");
!
999px

Console