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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>

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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-.

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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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Packages

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HTML 

              
                <a href="http://dribbble.com/shots/966016-Messages?list=users" style="color:#09c; padding:20px; display:block; clear:both; text-align:center;">A HTML version of 'Messages' by Coleman Tharp</a>

<div class="container">
  <div class="header">
    <h2>Messages</h2>
    <a href="#" title="Add Friend to this chat">+</a>
  </div>
  <div class="chat-box">
    <div class="message-box left-img">
      <div class="picture">
        <img src="https://dribbble.s3.amazonaws.com/users/2493/avatars/original/joey_head_new.png?1346157876" title="user name"/>
        <span class="time">10 mins</span>
      </div>
      <div class="message">
        <span>Bobby Giangeruso</span>
        <p>Hey Mike, how are you doing?</p>
      </div>
    </div>
    <div class="message-box right-img">
      <div class="picture">
        <img src="https://dribbble.s3.amazonaws.com/users/212696/avatars/small/monogram_pixel_perfect.png?1359994784" title="user name"/>
        <span class="time">2 mins</span>
      </div>
      <div class="message">
        <span>Mike Moloney</span>
        <p>Pretty good, Eating nutella, nommommom</p>
      </div>
    </div>
    <div class="enter-message">
      <input type="text" placeholder="Enter your message.."/>
      <a href="#" class="send">Send</a>
    </div>
  </div>
</div>
!

CSS 

              
                *{
  font-family:'Helvetica Neue',Helvetica, sans-serif;
  font-size:14px;
  margin:0;
}
a{
  font-weight:bold;
  color:#fff;
  text-decoration:none;
}
.container{
  width:400px;
  display:block;
  margin:0 auto;
  box-shadow:0 2px 5px rgba(0,0,0,0.4);
}
.header{
  padding:20px 20px 18px 20px;
  background:#5FB471;
  color:#fff;
}
.header h2{
  font-size:16px;
  line-height:15px;
  display:inline-block;
}
.header a{
  display:inline-block;
  float:right;
  background:#3d8b4e;
  font-size:25px;
  line-height:20px;
  padding:3px 6px;
  margin-top:-5px;
  border-radius:2px;
}
.chat-box, .enter-message{
  background:#ECECEC;
  padding:0 20px;
  color:#a1a1a1;
}
.chat-box .message-box{
  padding:18px 0 10px;
  clear:both;
}
.message-box .picture{
  float:left;
  width:50px;
  display:block;
  padding-right:10px;
}
.picture img{
  width:43px;
  height:48px;
  border-radius:5px;
}
.picture span{
  font-weight:bold;
  font-size:12px;
  clear:both;
  display:block;
  text-align:center;
  margin-top:3px;
}
.message{
  background:#fff;
  display:inline-block;
  padding:13px;
  width:274px;
  border-radius:2px;
  box-shadow: 0 1px 1px rgba(0,0,0,.04);
  position:relative;
}
.message:before{
  content:"";
  position:absolute;
  display:block;
  left:0;
  border-right:6px solid #fff;
  border-top: 6px solid transparent;
  border-bottom:6px solid transparent;
  top:10px;
  margin-left:-6px;
}
.message span{
  color:#555;
  font-weight:bold;
}
.message p{
  padding-top:5px;
}
.message-box.right-img .picture{
  float:right;
  padding:0;
  padding-left:10px;
}
.message-box.right-img .picture img{
  float:right;
}
.message-box.right-img .message:before{
  left:100%;
  margin-right:6px;
  margin-left:0;
  border-right:6px solid transparent;
  border-left:6px solid #fff;
  border-top: 6px solid transparent;
  border-bottom:6px solid transparent;
}
.enter-message{
  padding:13px 0px;
}
.enter-message input{
  border:none;
  padding:10px 12px;
  background:#d3d3d3;
  width:260px;
  border-radius:2px;
}
.enter-message a.send{
  padding:10px 15px;
  background:#6294c2;
  border-radius:2px;
  float:right;
}
!

JS 

              
                $(function(){
        
var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()+1; //January is 0!

var yyyy = today.getFullYear();
if(dd<10){dd='0'+dd} if(mm<10){mm='0'+mm} today = mm+'/'+dd+'/'+yyyy;
      });
!
999px

Console