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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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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>

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).

Add External Stylesheets/Pens

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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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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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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

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 

              
                <main>
<section>
 <time datetime="2015-07-26" class="blank"><span class="caldate">26</span></time>
 <time datetime="2015-07-27" class="hidden">
  <a href="http://thenewcode.com/1054/SVG-Meetup-Presentation-Interactive-Imagemaps"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/svg-meetup-thumb.png" alt="SVG Meetup Presentation: Interactive Imagemaps" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/svg-meetup-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/svg-meetup-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/svg-meetup-2x.png 125w">
   <span
   class="caldate">27</span><span class="title">Interactive Imagemaps Presentation</span></a>
 </time>
 <time datetime="2015-07-28" class="hidden">
  <a href="http://thenewcode.com/1055/12-Palette-Extractors-and-Resources-for-Site-Color-Inspiration"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peacock-thumb.jpg" alt="12 Palette Extractors and Resources for Site Color Inspiration" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peacock-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peacock-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peacock-2x.jpg 125w">
   <span
   class="caldate">28</span><span class="title">Palette Extractors & Resources</span></a>
 </time>
 <time datetime="2015-07-29" class="blank"><span class="caldate">29</span></time>
 <time datetime="2015-07-30" class="hidden">
  <a href="http://thenewcode.com/1056/Better-Diagrams-with-SVG-and-Blend-Modes"><img src="http://thenewcode.com/assets/svg/venn.svg" alt><span class="caldate">30</span><span class="title"> SVG Diagrams w/ Blend Modes</span></a>
 </time>
 <time datetime="2015-07-31" class="blank"><span class="caldate">31</span></time>
 <time datetime="2015-08-01" class="blank"><span class="caldate">01</span></time>
 <time datetime="2015-08-02" class="hidden">
  <a href="http://thenewcode.com/1057/SVG-Patterns-of-Japan"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/waves-thumb.png" alt="SVG Patterns of Japan" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/waves-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/waves-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/waves-2x.png 125w">
    
   <span
   class="caldate">02</span><span class="title">SVG Patterns of Japan</span></a>
 </time>
 <time datetime="2015-08-03" class="hidden">
  <a href="http://thenewcode.com/1058/Overlapping-Action-with-CSS-Animation"><img src="http://thenewcode.com/assets/svg/redbars.svg" alt><span class="caldate">03</span><span class="title">CSS Overlapping Animation</span></a>
 </time>
 <time datetime="2015-08-04" class="blank"><span class="caldate">04</span></time>
 <time datetime="2015-08-05" class="blank"><span class="caldate">05</span></time>
 <time datetime="2015-08-06" class="hidden">
  <a href="http://thenewcode.com/1059/Responsive-Image-Hinting-Using-the-w-Descriptor"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/toubana-diver-thumb.jpg" alt="Responsive Image Hinting: Using the w Descriptor" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/toubana-diver-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/toubana-diver-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/toubana-diver-2x.jpg 125w">
   <span
   class="caldate">06</span><span class="title">Using the w Descriptor</span></a>
 </time>
 <time datetime="2015-08-07" class="blank"><span class="caldate">07</span></time>
 <time datetime="2015-08-08" class="blank"><span class="caldate">08</span></time>
 <time datetime="2015-08-09" class="hidden">
  <a href="http://thenewcode.com/1060/SVG-Patterns-of-Africa"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/african-patterns-thumb.png" alt="SVG Patterns of Africa" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/african-patterns-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/african-patterns-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/african-patterns-2x-thumb.png 125w">
   <span
   class="caldate">09</span><span class="title">SVG African Patterns</span></a>
 </time>
 <time datetime="2015-08-10" class="hidden">
  <a href="http://thenewcode.com/1061/Bokeh-Backgrounds-with-SVG-and-JS"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bokeh-thumb.png" alt="Bokeh Backgrounds with SVG and JS" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bokeh-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bokeh-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bokeh-2x.png 125w">
   <span
   class="caldate">10</span><span class="title">SVG Bokeh Backgrounds</span></a>
 </time>
 <time datetime="2015-08-11" class="blank"><span class="caldate">11</span></time>
 <time datetime="2015-08-12" class="blank"><span class="caldate">12</span></time>
 <time datetime="2015-08-13" class="hidden">
  <a href="http://thenewcode.com/1062/Scribble-Image-Reveal-with-SVG-and-Blend-Modes"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/olga-thumb.jpg" alt="“Scribble” Image Reveal with SVG and Blend Modes" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/olga-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/olga-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/olga-2x.jpg 125w">
   <span
   class="caldate">13</span><span class="title">“Scribble” Image Reveal</span></a>
 </time>
 <time datetime="2015-08-14" class="blank"><span class="caldate">14</span></time>
 <time datetime="2015-08-15" class="blank"><span class="caldate">15</span></time>
 <time datetime="2015-08-16" class="blank"><span class="caldate">16</span></time>
 <time datetime="2015-08-17" class="hidden">
  <a href="http://thenewcode.com/1063/Techniques-and-Treatments-for-Background-Retina-Images"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/birds-on-wire-thumb.png" alt="Techniques and Treatments for Background Retina Images" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/birds-on-wire-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/birds-on-wire-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/birds-on-wire-2x.png 125w">
   <span
   class="caldate">17</span><span class="title">Background Retina Images</span></a>
 </time>
 <time datetime="2015-08-18" class="blank"><span class="caldate">18</span></time>
 <time datetime="2015-08-19" class="hidden">
  <a href="http://thenewcode.com/1064/Classical-Greek-Geometric-Borders-In-SVG"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/greek-geometrics-thumb.png" alt="Classical Greek Geometric Borders In SVG" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/greek-geometrics-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/greek-geometrics-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/greek-geometrics-2x.png 125w">
   <span
   class="caldate">19</span><span class="title">SVG Greek Geometric Borders</span></a>
 </time>
 <time datetime="2015-08-20" class="blank"><span class="caldate">20</span></time>
 <time datetime="2015-08-21" class="blank"><span class="caldate">21</span></time>
 <time datetime="2015-08-22" class="blank"><span class="caldate">22</span></time>
 <time datetime="2015-08-23" class="hidden">
  <a href="http://thenewcode.com/1065/Better-Image-Borders-with-Blend-Modes"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peugot-thumb.jpg" alt="Better Image Borders with Blend Modes" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peugot-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peugot-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peugot-2x.jpg 125w">
   <span
   class="caldate">23</span><span class="title">Blend Mode Borders</span></a>
 </time>
 <time datetime="2015-08-24" class="hidden">
  <a href="http://thenewcode.com/1/Welcome-to-The-New-Code"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/the-new-code-thumb.png" alt="Welcome to The New Code" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/the-new-code-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/the-new-code-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/the-new-code-square-2x.png 125w">
   <span
   class="caldate">24</span><span class="title">The New Code</span></a>
 </time>
 <time datetime="2015-08-25" class="blank"><span class="caldate">25</span></time>
 <time datetime="2015-08-26" class="hidden">
  <a href="http://thenewcode.com/2/Precognitive-Pages-Using-Resource-Hints-to-Accelerate-Site-Performance"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/alexander-thumb.jpg" alt="Precognitive Pages: Using Resource Hints to Accelerate Site Performance" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/alexander-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/alexander-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/alexander-2x.jpg 125w">
   <span
   class="caldate">26</span><span class="title">Using Resource Hints</span></a>
 </time>
 <time datetime="2015-08-27" class="blank"><span class="caldate">27</span></time>
 <time datetime="2015-08-28" class="hidden">
  <a href="http://thenewcode.com/4/In-Other-Words-Using-the-blockquote-cite-and-q-elements"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bertrand-russell-thumb.jpg" alt="In Other Words: Using the blockquote, cite and q elements" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bertrand-russell-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bertrand-russell-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bertrand-russell-2x-thumb.jpg 125w">
   <span
   class="caldate">28</span><span class="title">blockquote, cite and q</span></a>
 </time>
 <time datetime="2015-08-29" class="blank"><span class="caldate">29</span></time>
 <time datetime="2015-08-30" class="blank"><span class="caldate">30</span></time>
 <time datetime="2015-08-31" class="blank"><span class="caldate">31</span></time>
 <time datetime="2015-09-01" class="blank"><span class="caldate">01</span></time>
</section>
</main>
!

CSS 

              
                body { 
  background: #111;
  font-family: Avenir, Helvetica, sans-serif;
}
main a { text-decoration: none; }
section {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-flow: wrap;
      -ms-flex-flow: wrap;
          flex-flow: wrap;
  font-size: 0;
}

section time {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
-webkit-flex: 1 1 14.2857%;
      -ms-flex: 1;
          flex: 1;
  min-width: 14.2857%;
  max-width: 14.2857vw;
  position: relative;
  font-size: 1.8vw;
  line-height: 0;
  -webkit-transition: .35s opacity;
          transition: .35s opacity;
}
section time.blank {
    min-height: 14vw; 
}
section time a { 
    display: inline-block; 
    width: 100%; height: 100%; 
    position: inherit;
    border-bottom: none;
    outline: none;
    }
section time span { position: absolute; }
span.caldate { 
    top: 10%; left: 7px; 
    z-index: 2;
    }
section time.blank span.caldate {   
  color: #333; 
}
section time a span.title { 
    width: 100%; height: 100%;
    line-height: 1.1;
    left: 0; top: 0; padding-left: 5%;
    padding-right: 5%;
    padding-top: 20%; opacity: 0;
    -webkit-transition: .4s opacity;
    transition: .4s opacity;
}
section time:hover a span.title { 
    background: rgba(0,0,0,0.8);
    opacity: 1;
}
section time a:hover {
    border-bottom: none;
}
time:not(.blank) span { 
    color: #fff; text-shadow: 1px 1px 1px rgba(0,0,0,0.8);
}
section time a img { width: 100%; }

.hidden { opacity: 0; }

@media all and (max-width: 950px) {
    section time.blank { display: none; }
    section time { 
        min-width: 20%;
        max-height: 20vw;
        max-width: 20vw;
        font-size: 3vw;
    }
}
@media all and (max-width: 750px) {
    section time { 
        min-width: 33%;
        max-height: 33vw;
        font-size: 5vw;
    }
}
@media all and (max-width: 450px) {
    section time { 
        min-width: 50%;
        max-height: 50vw;
        font-size: 5vw;
    }
}
!

JS 

              
                var dates = document.querySelectorAll("section time.hidden");
    var i = 1;
    Array.prototype.forEach.call(dates, function(caldate) {
        setTimeout(function(){ caldate.classList.remove("hidden") }, 250*i)
        i++;
})
!
999px

Console