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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>

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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).

Add External Stylesheets/Pens

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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

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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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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 

              
                <hr class="fade">
<hr class="fade-2">
<hr class="dots">
<hr class="accessory">
<hr class="pill">
<hr class="vertical-lines">
<hr class="horizontal-lines">
<hr class="slash-1">
<hr class="slash-2">
<hr class="slash-3">
<hr class="bookends">
<hr class="bookends-dots">
<hr class="flair">
<hr class="wave">
<hr class="shine">
<hr class="charlie">
<hr class="stars">
!

CSS 

              
                /* Reset */
*:before, *:after { content: ''; }
hr {
  border: 0;
  margin: 1.35em auto;
  max-width: 100%;
  background-position: 50%;
  box-sizing: border-box;
}

.fade {
  height: 1px;
  $color: red;
  color: $color;
  background-image: linear-gradient(
    90deg,
    rgba($color, 0),
    rgba($color, 1) 50%,
    rgba($color, 0) 100%);
}

.fade-2 {
  border-width: 0 0 1px;
  $color: skyblue;
  color: $color;
  border-image: linear-gradient(
    90deg,
    rgba($color, 0),
    rgba($color, 1) 50%,
    rgba($color, 0) 100%) 0 0 100%;
  border-style: solid;
}

.dots {
  $color: orange;
  color: $color;
  // height: 8px;
  border-width: 0 0 8px;
  border-style: solid;
  border-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 2 1" width="8" height="4"><circle fill="#{$color}" cx="1" cy="0.5" r="0.5"/></svg>') 0 0 100% repeat;
   width: 216px;
}

.accessory {
  height: 6px;
  background-image: radial-gradient(
    closest-side,
    hsla(0, 0%, 50%, 1.0),
    hsla(0, 0%, 50%, 0) 100%);
  position: relative;
}
.accessory:after {
  position: absolute;
  top:  50%;
  left: 50%;
  display:block;
  background-color: hsl(0, 0%, 75%);
  height: 12px;
  width:  12px;
  transform: rotate(45deg);
  margin-top:  -10px;
  margin-left: -10px;
  border-radius: 4px 0;
  border: 4px solid hsla(0, 0%, 100%, 0.35);
  background-clip: padding-box;
  box-shadow: -10px 10px 0 hsla(0, 0%, 100%, 0.15), 10px -10px 0 hsla(0, 0%, 100%, 0.15);
}

.pill {
  height:0px;
  border-radius: 2px;
  $color: teal;
  color: $color;
  border: 2px solid currentColor;
  width: 80%;
}

.vertical-lines {
  height: 10px;
  $color: orange;
  color: $color;
  background-image: linear-gradient(
    90deg,
    currentColor,
    currentColor 33.33%,
    transparent 33.33%,
    transparent 100%);
  background-size: 3px 100%;
  width: 60%;
}

.horizontal-lines {
  height: 10px;
  $color: green;
  color: $color;
  background-image: linear-gradient(
    currentColor,
    currentColor 33.33%,
    transparent 33.33%,
    transparent 100%);
  background-size: 100% 3px;
  width: 40px;
}

.slash-1 {
  height: 10px;
  $color: rebeccapurple;
  color: $color;
  background-image: linear-gradient(-45deg,
    transparent,
    transparent 25%,
    currentColor 25%,
    currentColor 50%,
    transparent 50%,
    transparent 75%,
    currentColor 75%);
  background-size: 10px 10px;
  width: 250px;
}

.slash-2 {
  height: 8px;
  $color: darkmagenta;
  color: $color;
  background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="3px" height="3px" viewBox="0 0 3 3" fill="#{$color}"><polygon points="0,0.5 0,1.5 1.5,3 2.5,3"/><polygon points="2.5,0 1.5,0 3,1.5 3,0.5"/></svg>');
  background-size: 3px 3px;
  width: 65%;
}

.slash-3 {
  height: 10px;
  background-image: linear-gradient(45deg,
    hsla(0, 0%, 5%, 0),
    hsla(0, 0%, 5%, 0) 33.33%,
    hsla(0, 0%, 5%, 1) 33.33%,
    hsla(0, 0%, 5%, 1) 66.67%,
    hsla(0, 0%, 5%, 0) 66.67%,
    hsla(0, 0%, 5%, 0) 100%);
  background-size: 10px 100%;
  width: 250px;
}

.bookends {
  position: relative;
  border-width: 5px;
  border-color: hsl(0, 0%, 50%) transparent;
  height: 11px;
  border-style: double;
  width: 20%;
}
.bookends:before,
.bookends:after {
  position: absolute;
  bottom: -3.536px;
  width: 7.071px;
  height: 7.071px;
  display: block;
  border-width: 0 7.071px 7.071px 0;
  border-color: hsl(0, 0%, 50%);
  border-style: double;
  box-sizing: border-box;
}
.bookends:before {
  transform: translateZ(0) rotate(-45deg);
  left: -21px;
}
.bookends:after {
  transform: translateZ(0) rotate(135deg);
  right: -21px;
}

.bookends-dots {
  position: relative;
  border-bottom: 1px solid hsla(0, 0%, 50%, 0.75);
  width: 50%;
}
.bookends-dots:before,
.bookends-dots:after {
  position: absolute;
  bottom: -5px;
  width: 10px;
  height: 10px;
  display: block;
  border-width: 0 1px 1px 0;
  border-color: hsla(0, 0%, 50%, 0.75);
  border-style: solid;
  box-sizing: border-box;
  border-radius: 100%;
}
.bookends-dots:before {
  transform: translateZ(0) rotate(-45deg);
  left: -10px;
}
.bookends-dots:after {
  transform: translateZ(0) rotate(135deg);
  right: -10px;
}

.flair {
  width: 65%;
  height: 30px;
  border-style: solid;
  border-color: hsla(0, 0%, 75%, 0.9);
  border-width: 1px 0 0 0;
  border-radius: 15px;
}
.flair:before {
  display: block;
  height: 30px;
  margin-top: -31px;    
  border-style: solid;
  border-color: hsla(0, 0%, 75%, 0.9);
  border-width: 0 0 1px 0;
  border-radius: 15px;
}


/* Wave */
@mixin wavy-border($color:#000, $stroke:1, $width:50, $height:25) {
  border-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 #{$width} #{$height+$stroke}" width="#{$width}" height="#{$height+$stroke}"><path fill="none" stroke="#{$color}" stroke-width="#{$stroke}" d="M0,#{$height+($stroke/2)}c#{$width/4},0,#{$width/4}-#{$height},#{$width/2}-#{$height}s#{$width/4},#{$height},#{$width/2},#{$height}"/></svg>') 0 0 100% repeat;
  border-width: 0 0 #{$height+$stroke}px;
  border-style: solid;
}

.wave {
  width: 35%;
  @include wavy-border(hsla(0, 0%, 75%, 0.9), 3, 12, 12);
  position: relative;
}

.wave:before,
.wave:after {
  position: absolute;
  display: block;
  width: 20px;
  height: 30px;
  background-color: hsl(0, 0%, 75%);
  bottom: -22.5px;
}

.wave:before {
  border-radius: 30px 0 0 30px;
  left: -2px;
}

.wave:after {
  border-radius: 0 30px 30px 0;
  right: -2px;
}

/* Shine */
.shine {
  height: 20px;
  width: 60%;
  background-image: radial-gradient(
    farthest-side at 50% -50%,
    hsla(0, 0%, 0%, 0.5),
    hsla(0, 0%, 0%, 0));
  position: relative; 
}

.shine::before {
  height: 1px;
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  background-image: linear-gradient(
    90deg,
    hsla(0, 0%, 0%, 0),
    hsla(0, 0%, 0%, 0.75) 50%,
    hsla(0, 0%, 0%, 0));
}

/* Charlie */
.charlie {
  position: relative;
  font-size: 1.5em;
  height: 1em;
  border: 0;
  -webkit-filter: drop-shadow(hsla(0, 0%, 0%, 0.75) 1px 3px 5px);
  width: 75%;
}

.charlie:before,
.charlie:after {
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  background-size: 1em 100%;
  height: inherit;
}

.charlie:before {
  background-image:
    linear-gradient(315deg, hsla(0, 0%, 0%, 0.75) 25%, transparent 25%),
    linear-gradient(45deg, hsla(0, 0%, 0%, 0.75) 25%, transparent 25%);
  background-position: 50%;
  top: -0.5em;
}

.charlie:after {
  background-image: 
    linear-gradient(135deg, hsla(0, 0%, 0%, 0.75) 25%, transparent 25%),
    linear-gradient(225deg, hsla(0, 0%, 0%, 0.75) 25%, transparent 25%);
  background-position: -webkit-calc(50% - 0.5em);
  top: 0.5em;
}

.stars {
  height: auto;
  color: gold;
  text-align: center;
  &:after {
    content: "★";
    font-size: 2em;
    text-shadow:
      -2em 0,
      -1em 0,
       1em 0,
       2em 0;
  }
}

/* Background */
html {
  color: rgb(238, 238, 238);
  background: #f0ebdc;
}
!

JS 

              
                /**
 * I prefer to style the border's `border-image`, and I avoid using pseudo
 * elements when possible, so the styles may be applied to block level
 * elements, for use where an <hr> would be non-semantic.
 */

/* Inline XML data URI fix */
/* Some browsers (most browsers) don't render inline XML data URI's unless they are escaped. */
(function() {

if(!window.StyleFix) return;
if(hasxmldatauri()) return;
  
// Test unescaped XML data uri
function hasxmldatauri() {
  var img = new Image();
  datauri = 'data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0,0 1,1" fill="#000"></svg>';
  img.src = datauri;
  return (img.width == 1 && img.height == 1);
}

StyleFix.register(function(css) {

  return css.replace(RegExp(/url\(\'data:image\/svg\+xml,(.*)\'\)/gi), function($0, svg) {
		return "url('data:image/svg+xml," + escape(svg) + "')";
	});
  
});

})();

/* Radial Gradient Syntax fix */
StyleFix.register(function(css, raw) {
	if (PrefixFree.functions.indexOf('radial-gradient') > -1) {
		css = css.replace(/radial-gradient\(([a-z-\s]+\s+)?at ([^,]+)(?=,)/g, function($0, shape, center){
			return 'radial-gradient(' + center + (shape? ', ' + shape : '');
		});
	}

	return css;
});
!
999px

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