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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

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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.

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

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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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