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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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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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HTML 

              
                <a class='face-book' expr:href='&quot;https://www.facebook.com/sharer.php?u=&quot; + data:post.url + &quot;&amp;t=&quot; + data:post.title' rel='nofollow' target='_blank' title='Share This On Facebook'><img alt='Facebook' src='https://3.bp.blogspot.com/-tdQqSrGyK0A/UixIE6-nIHI/AAAAAAAADZw/L1_oZ77XZZI/s1600/Facebook.gif'/></a>
<!-- Twitter --> 
<a class='twitter' expr:href='&quot;http://twitthis.com/twit?url=&quot; + data:post.url + &quot;&amp;title=&quot; + data:post.title' rel='nofollow' target='_blank' title='Tweet This'><img alt='Twitter' src='https://4.bp.blogspot.com/-qvZuf9kWuVw/UixIHKAZdSI/AAAAAAAADao/7AOSXVkuwdc/s1600/twitter_bird.gif'/></a>
<!-- Pinterest --> 
<a class='pint-er-est' href='javascript:void((function()%7Bvar%20e=document.createElement(&apos;script&apos;);e.setAttribute(&apos;type&apos;,&apos;text/javascript&apos;);e.setAttribute(&apos;charset&apos;,&apos;UTF-8&apos;);e.setAttribute(&apos;src&apos;,&apos;https://assets.pinterest.com/js/pinmarklet.js?r=&apos;+Math.random()*99999999);document.body.appendChild(e)%7D)());'><img alt='Pinterest' src='https://4.bp.blogspot.com/-48BGp-jLpfA/UixIFoAoAHI/AAAAAAAADaA/a4SMqKDRqno/s1600/Pinterest.gif'/></a>
<!-- Stumbleupon --> 
<a class='stumbleupon' expr:href='&quot;http://www.stumbleupon.com/submit?url=&quot; + data:post.url + &quot;&amp;title=&quot; + data:post.title' rel='nofollow' target='_blank' title='Stumble this'><img alt='StumbleUpon' src='https://3.bp.blogspot.com/-Wa5Tyh1r3Ng/UixIG9GvWrI/AAAAAAAADas/yzizUt7zQ9k/s1600/stumbleupn.gif'/></a>
<!-- Delicious --> 
  <a class='del-icio-us' expr:href='&quot;http://del.icio.us/post?url=&quot; + data:post.url + &quot;&amp;title=&quot; + data:post.title' rel='nofollow' target='_blank' title='Share This On Delicious'><img alt='Delicious' src='https://1.bp.blogspot.com/-4EdR0vYOqGM/Ui3DwhBBxHI/AAAAAAAADbA/CI5Tremd7D8/s1600/Delicious.gif'/></a>
<!-- Reddit --> 
<a class='reddit' expr:href='&quot;http://reddit.com/submit?url=&quot; + data:post.url + &quot;&amp;title=&quot; + data:post.title' rel='nofollow' target='_blank' title='Bookmark this'><img alt='Reddit' src='https://2.bp.blogspot.com/-Q0wmiZUSwRA/UixIGRda0xI/AAAAAAAADaU/U1hgC4cviXc/s1600/reddit.gif'/></a>
<!-- Digg --> 
<a class='digg' expr:href='&quot;https://digg.com/submit?phase=2&amp;url=&quot;  + data:post.url' rel='nofollow' target='_blank' title='Digg This'><img alt='Digg' src='https://3.bp.blogspot.com/-jrj7YxfIPgE/UixIFjv-vfI/AAAAAAAADaE/an-JwfXh9KI/s1600/digg.gif'/></a>
<!-- Email --> 
<a href='mailto:?Subject=My Blogger Tricks&amp;Body=Check out this site.. http://www.myblogger-tricks.com' rel='nofollow' target='_blank' title='Email This'><img alt='Email' src='https://1.bp.blogspot.com/-1-6g64zlV8E/UixIGPBkoKI/AAAAAAAADaQ/S_vYcUEpZ4M/s1600/email.gif'/></a>
<!-- addtoany --> 
  <a class='a2a_dd more' expr:href='&quot;http://www.addtoany.com/share_save?url=&quot; + data:post.url + &quot;&amp;title=&quot; + data:post.title ' rel='nofollow' target='_blank' title='Share On Others Networks'><script src='http://static.addtoany.com/menu/page.js' type='text/javascript'/><img alt='Delicious' src='https://3.bp.blogspot.com/-d5s1xCQ1FaA/Ui3FWCqhUBI/AAAAAAAADbM/j5EYPxb_hz4/s1600/share-to-any.gif'/></a>
</div> 
</center>
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CSS 

              
                div#social-sharing   { 
width:550px; 
height: 90; 
background: radial-gradient(center center, circle cover, #ffffff, #f9f9f9); 
background: -o-radial-gradient(center center, circle cover, #ffffff, #f9f9f9); 
background: -ms-radial-gradient(center center, circle cover, #ffffff, #f9f9f9); 
background: -moz-radial-gradient(center center, circle cover, #ffffff, #f9f9f9); 
background: -webkit-radial-gradient(center center, circle cover, #ffffff, #f9f9f9); 
padding:10px; 
margin:0 auto; 
border: 1px solid #999; 
border-radius:5px; 
-webkit-border-radius:5px 5px 5px 5px; 
-moz-border-radius:5px 5px 5px 5px; 
-webkit-transition: all 0.6s ease-out; 
-moz-transition: all 0.6s ease-out; 
-o-transition: all 0.6s ease-out; 
-ms-transition: all 0.6s ease-out; 
transition: all 0.6s ease-out;
}
div#social-sharing:hover { 
-webkit-box-shadow: 1px 1px 3px #CCC inset; 
-moz-box-shadow: 1px 1px 3px #CCC inset; 
box-shadow: 1px 1px 3px #CCC inset; 
}
#social-sharing img { 
width: 35px; 
padding: 5px; 
border: 0; 
box-shadow: 0; 
display: inline; 
opacity:1; 
filter:alpha(opacity=1); /* For IE8 and earlier */ 
}
#social-sharing img:hover { 
-webkit-transition: all 0.6s ease-out; 
-moz-transition: all 0.6s ease-out; 
-o-transition: all 0.6s ease-out; 
-ms-transition: all 0.6s ease-out; 
transition: all 0.6s ease-out; 
opacity:0.6; 
filter:alpha(opacity=60); /* For IE8 and earlier */ 
}
.social-sharing-title { 
text-align: center; 
padding: 3px 10px 2px 0px; 
margin: 0 0px 0 0; 
color: #8d0303; text-transform: uppercase; 
line-height: 25px; 
vertical-align: middle; 
font-size: 14px; 
}
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JS
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999px

Console