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HTML

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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>

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!
Insecure Resource

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CSS

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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

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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 

              
                <nav class="breadcrumb">
  <h2 id="breadcrumblabel" class="invisible">You are here:</h2>
  <ol aria-labelledby="breadcrumblabel" itemscope itemtype="http://schema.org/BreadcrumbList" id="breadcrumbList">
    <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem" id="home">
      <a href="/" itemprop="item">Homepage</a>
      <meta itemprop="position" content="1" />
      <svg class="arrow" aria-hidden="true"><use xlink:href="#arrow"></use></svg>      
    </li>
    <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
      <a href="/clothing/" itemprop="item">Clothing</a>
      <meta itemprop="position" content="2" />
      <svg class="arrow" aria-hidden="true"><use xlink:href="#arrow"></use></svg> 
    </li>
    <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
      <a href="/clothing/mens/" itemprop="item">Men's clothing</a>
      <meta itemprop="position" content="3" />
      <svg class="arrow" aria-hidden="true"><use xlink:href="#arrow"></use></svg> 
    </li>
    <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
      <a href="/clothing/mens/shoes/" itemprop="item">Shoes &amp; footwear</a>
      <meta itemprop="position" content="4" />
      <svg class="arrow" aria-hidden="true"><use xlink:href="#arrow"></use></svg> 
    </li>
    <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
      <a href="/clothing/mens/shoes/leather/" itemprop="item">Leather</a>
      <meta itemprop="position" content="5" />
      <svg class="arrow" aria-hidden="true"><use xlink:href="#arrow"></use></svg> 
    </li>    
    <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
      <a href="/clothing/mens/shoes/leather/boots/" itemprop="item" rel="prev">Boots</a>
      <meta itemprop="position" content="6" />
      <svg class="arrow" aria-hidden="true"><use xlink:href="#arrow"></use></svg> 
    </li>
    <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
      <strong title="current page" itemprop="item" aria-current="location">Cowboy boots</strong>
      <meta itemprop="position" content="7" />
    </li>
  </ol>
</nav>

<svg class="svg-sprite" aria-hidden="true" id="arrow" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><path d="M 64.00,416.00l 96.00,96.00l 256.00-256.00L 160.00,0.00L 64.00,96.00l 160.00,160.00L 64.00,416.00z"/></svg>
!

CSS 

              
                body {
  font-family: Arial, sans-serif;
  font-size: 100%;
}

a {
  display: block;
  padding: 5px 0;
  color: #000000;
  outline: none;
  text-decoration: none;
}
a:hover, a:focus, a:active {
  padding-bottom: 3px;
  outline: 1px solid transparent;
  border-bottom: 2px solid #000000;
}

button::-moz-focus-inner {
  border: 0;
}

button {
  box-sizing: border-box;
  font-size: 0.75rem;
  font-weight: bold;
  margin: 0 0.375rem 0 0;
  width: 1.75rem;
  height: 1.25rem;
  cursor: pointer;
  outline: none;
  border-radius: 4px;
  border: none;
  box-shadow: 0px 0px 1px 0px rgba(0,0,0,0.75);
  background-color: #efefef;
}

button:hover,
button:focus,
button:active {
  outline: 1px solid transparent;
  box-shadow: 0px 0px 1px 1px rgba(0,0,0,0.75);
}

.svg-sprite {
  position: absolute;;
  top: -999999px;
  left: -999999px;
  z-index: -1;
  overflow: hidden;
}

.arrow {
  display: block;
  width: 0.5rem;
  height: 0.5rem;
  margin: 0 0.25rem 0 0.25rem;
  fill: #000000;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  font-size: 0.75rem;
  margin: 0;
  padding: 0;
}

.breadcrumb li {
  display: flex;
  justify-content: center; 
  align-items: center;
  flex-wrap: nowrap; 
  list-style-type: none;
  max-width: 100%;
}

html.js .breadcrumb li {
  z-index: -1;
  max-width: 0;
  visibility: hidden;
  transition: max-width 0.25s ease,  visibility 0.25s ease;
}
html.js .breadcrumb .js-expanded li {
  display: flex;
  max-width: 100%;
  visibility: visible;
  z-index: 0;
}


html.js .breadcrumb li:first-of-type,
html.js .breadcrumb li:nth-last-of-type(-n+3) {
  display: flex;
  max-width: 100%;
  visibility: visible;
  z-index: 0;  
}

@media (min-width: 480px) {
  html.js .breadcrumb li {
    display: flex;
    max-width: 100%;
    visibility: visible;
    z-index: 0;
  }
}

/* Helpers */
 .invisible {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
} 

/* JS BREAKPOINTS */
/* as described here: https://www.lullabot.com/articles/importing-css-breakpoints-into-javascript */
body:before {
  content: "smartphone";
  display: none;
}

@media (min-width: 480px) {
  body:before {
    content: "smartphone_wide";
  }
}
!

JS 

              
                var collapseList = function () {

  var breadcrumbList = $('#breadcrumbList');
  var breadcrumbListElement = $('#breadcrumbList li');
  var button = '<button aria-expanded="false" id="collapse" aria-controls="breadcrumbList" title="collapse navigation" type="button"><span class="invisible"></span>&hellip;</button>';
  var breadcrumbSize = breadcrumbListElement.length;

  // breakpoint smartphone (0 - 480px, see css)
  if (breakpoint.value === 'smartphone') {
    
    // only collapse breadcrumb, when it contains more than 4 items
    if (!$('#collapse').length > 0 && breadcrumbSize > 4) {

      // put collapse button close to homepage link
      $('#home').append(button);

      var collapse = $('#collapse');

      // get hidden list elements
      var hiddenElements = $(breadcrumbListElement).filter(function() {
        return $(this).css('visibility') == 'hidden';
      });

      // helper function to determine object size
      Object.size = function(obj) {
        var size = 0, key;
        for (key in obj) {
          if (obj.hasOwnProperty(key)) size++;
        }
        return size;
      };

      var size = Object.size(hiddenElements);

      // set help text for buttons title attribute and hidden text
      var helpText = 'Show ' + size + ' more navigation levels';
      $(collapse).attr('title', helpText);
      $(collapse).find('.invisible').append(helpText);

      // collapse other elements (css) by setting class on list and remove collapse button
      $(collapse).click(function(){
        $(breadcrumbList).addClass('js-expanded');
        $(collapse).remove();
      });
    }
  }
  // breakpoint smartphone_wide (480px +, see css)
  if (breakpoint.value === 'smartphone_wide') {
    $('#collapse').remove();
    $(breadcrumbList).removeClass('js-expanded');
  }
}

/* JS BREAKPOINTS */
/* as described here: https://www.lullabot.com/articles/importing-css-breakpoints-into-javascript */
var breakpoint = {};
breakpoint.refreshValue = function() {
  this.value = window.getComputedStyle(document.querySelector('body'), ':before').getPropertyValue('content').replace(/\"/g, '');
};
$(window).resize(function() {
  breakpoint.refreshValue();
  collapseList();
}).resize();

$(document).ready(function(){
  breakpoint.refreshValue();
});
!
999px

Console