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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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CSS

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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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <!-- http://html5doctor.com/cite-and-blockquote-reloaded/ -->

<main>
  <h1>Blockquotes</h1>

  <blockquote class="right">
    <p>
      <a href="http://www.w3.org/TR/html5/">Previously in HTML5</a> it is [sic] was not conforming to include citations within <code>blockquote</code> elements. Now it is, as long as the citation content is within a <code>cite</code> or <code>footer</code> element.
    </p>
    <footer>
      <cite><a href="http://html5doctor.com/cite-and-blockquote-reloaded/">cite and blockquote – reloaded</a>, HTML5 Doctor, Steve Faulkner</cite>
    </footer>
  </blockquote>

  <p>
    <strong>Accounting for the pattern where a <code>footer</code> is used and not. Also accounting for floated blocks (to make sure the <code>cite</code> is spaced appropriately for a narrower display). Inline and Twitter options below all the nonsense text.</strong>
  </p>

  <p>
    Cupcake ipsum dolor. Sit amet jelly-o cake cookie donut muffin bear claw. Cookie tiramisu jelly icing cheesecake jujubes. Jelly beans icing pastry chocolate. Pudding sesame snaps chupa chups liquorice marzipan gummies. Cupcake applicake toffee.
  </p>

  <p>
    Chocolate bar gingerbread macaroon lollipop pie icing. Dragée jelly-o jujubes cheesecake cake pie topping sweet roll. Candy canes pudding candy chocolate bar bonbon. Jelly-o dragée brownie pastry candy canes marzipan powder. Fruitcake sesame snaps liquorice oat cake danish chocolate sweet roll. Donut cheesecake cookie chocolate cake topping. Bear claw toffee halvah apple pie chocolate bar danish muffin. Unerdwear.com soufflé bonbon macaroon pie.
  </p>

  <p>
    Gummies croissant cookie jujubes. Bonbon pudding cookie. Dragée bear claw cheesecake. Bear claw chocolate chocolate cake applicake tootsie roll. Gummi bears cupcake tart halvah tootsie roll. Topping soufflé sesame snaps pastry gummi bears pie. Gummies pastry danish lollipop. Tart chupa chups dessert.
  </p>

  <blockquote>
    <p>
      <a href="http://www.w3.org/TR/html5/">Previously in HTML5</a> it is [sic] was not conforming to include citations within <code>blockquote</code> elements. Now it is, as long as the citation content is within a <code>cite</code> or <code>footer</code> element.
    </p>
    <footer>
      <cite><a href="http://html5doctor.com/cite-and-blockquote-reloaded/">cite and blockquote – reloaded</a>, HTML5 Doctor, Steve Faulkner</cite>
    </footer>
  </blockquote>

  <p>
    Soufflé soufflé bear claw sweet cookie topping gummies. Marshmallow chupa chups cake sweet applicake chupa chups candy canes cake halvah. Toffee jelly-o toffee halvah candy canes gummi bears. Jelly-o donut danish oat cake fruitcake chupa chups. Dragée apple pie dragée fruitcake jelly macaroon pastry muffin. Gummi bears chocolate macaroon pastry. Jujubes lollipop chupa chups carrot cake pastry chocolate cake toffee.
  </p>

  <blockquote>
    <ul>
      <li>Toffee jelly-o toffee</li>
      <li>halvah candy canes gummi bears</li>
      <li>Jelly-o donut danish</li>
      <li>oat cake fruitcake chupa chups</li>
    </ul>
  </blockquote>

  <p>
    Liquorice powder icing. Cheesecake sweet cheesecake powder jelly gummi bears. Tootsie roll apple pie pie apple pie liquorice. Jelly wafer sugar plum. Bonbon sesame snaps donut. Macaroon lemon drops apple pie fruitcake cupcake gummies biscuit chupa chups croissant. Tootsie roll chocolate cake cheesecake jujubes gummies chocolate bar caramels. Chocolate cake brownie sesame snaps pudding ice cream cookie icing candy halvah.
  </p>

  <blockquote class="left">
    <p>
      Donut donut bear claw oat cake biscuit candy <em>canes tart</em> unerdwear.com. <i>Sweet jelly-o</i> cotton candy liquorice gingerbread carrot cake.
    </p>
    <footer>
      <cite>Xenu Xenu the Something or Other or Other or Other or Other or Other or Other or Other or Other or Other or Otheror Other or Other or Other or Other or Other or Other or Other</cite>
    </footer>
  </blockquote>

  <p>
    Cupcake ipsum dolor. Sit amet jelly-o cake cookie donut muffin bear claw. Cookie tiramisu jelly icing cheesecake jujubes. Jelly beans icing pastry chocolate. Pudding sesame snaps chupa chups liquorice marzipan gummies. Cupcake applicake toffee.
  </p>

  <p>
    Chocolate bar gingerbread macaroon lollipop pie icing. Dragée jelly-o jujubes cheesecake cake pie topping sweet roll. Candy canes pudding candy chocolate bar bonbon. Jelly-o dragée brownie pastry candy canes marzipan powder. Fruitcake sesame snaps liquorice oat cake danish chocolate sweet roll. Donut cheesecake cookie chocolate cake topping. Bear claw toffee halvah apple pie chocolate bar danish muffin. Unerdwear.com soufflé bonbon macaroon pie.
  </p>

  <p>
    Gummies croissant cookie jujubes. Bonbon pudding cookie. Dragée bear claw cheesecake. Bear claw chocolate chocolate cake applicake tootsie roll. Gummi bears cupcake tart halvah tootsie roll. Topping soufflé sesame snaps pastry gummi bears pie. Gummies pastry danish lollipop. Tart chupa chups dessert.
  </p>

  <p>
    Cupcake ipsum dolor. Sit amet jelly-o cake cookie donut muffin bear claw. Cookie tiramisu jelly icing cheesecake jujubes. Jelly beans icing pastry chocolate. Pudding sesame snaps chupa chups liquorice marzipan gummies. Cupcake applicake toffee.
  </p>

  <p>
    Cupcake ipsum dolor. Sit amet jelly-o cake cookie donut muffin bear claw. Cookie tiramisu jelly icing cheesecake jujubes. Jelly beans icing pastry chocolate. Pudding sesame snaps chupa chups liquorice marzipan gummies. Cupcake applicake toffee.
  </p>

  <p>
    Chocolate bar gingerbread macaroon lollipop pie icing. Dragée jelly-o jujubes cheesecake cake pie topping sweet roll. Candy canes pudding candy chocolate bar bonbon. Jelly-o dragée brownie pastry candy canes marzipan powder. Fruitcake sesame snaps liquorice oat cake danish chocolate sweet roll. Donut cheesecake cookie chocolate cake topping. Bear claw toffee halvah apple pie chocolate bar danish muffin. Unerdwear.com soufflé bonbon macaroon pie.
  </p>

  <h2>Inline Quotes</h2>

  <p>
    Cupcake ipsum dolor. Sit amet jelly-o cake cookie donut muffin bear claw. Cookie tiramisu jelly icing cheesecake jujubes. <q>Jelly beans icing pastry chocolate.</q> Pudding sesame snaps chupa chups liquorice marzipan gummies. Cupcake applicake toffee.
  </p>

  <h2>Tweets</h2>

  <p>
    <strong>Tweets don't use a <code>footer</code>/<code>cite</code> pattern, so I opt to override the styles to match the <code>footer</code>/<code>cite</code> and then re-create the styles on the sole <code>p</code>. It's a mess, but it can work. This is to address cases where I don't want Twitter's script firing to format the tweet, or for users with connection woes.</strong>
  </p>

<blockquote class="twitter-tweet" lang="en"><p>Realizing my paper crown from Christmas poppers is as temporary as my shave cream beard. <a href="http://t.co/uGideOUzZg">http://t.co/uGideOUzZg</a></p>&mdash; Adrian Roselli (@aardrian) <a href="https://twitter.com/aardrian/status/550723880919527425">January 1, 2015</a></blockquote>

  <p>
    Cupcake ipsum dolor. Sit amet jelly-o cake cookie donut muffin bear claw. Cookie tiramisu jelly icing cheesecake jujubes. Jelly beans icing pastry chocolate. Pudding sesame snaps chupa chups liquorice marzipan gummies. Cupcake applicake toffee.
  </p>

<blockquote class="twitter-tweet left" lang="en"><p>Alt: movie theater marquee: &quot;Jaws 19&quot; by Max Spielberg.&#10;RT <a href="https://twitter.com/NorthParkTheatr">@NorthParkTheatr</a>: No hoverboarding in the theatre, please! <a href="http://t.co/3e1OGuNfEl">pic.twitter.com/3e1OGuNfEl</a></p>&mdash; Adrian Roselli (@aardrian) <a href="https://twitter.com/aardrian/status/550644586025324544">January 1, 2015</a></blockquote>

  <p>
    Cupcake ipsum dolor. Sit amet jelly-o cake cookie donut muffin bear claw. Cookie tiramisu jelly icing cheesecake jujubes. Jelly beans icing pastry chocolate. Pudding sesame snaps chupa chups liquorice marzipan gummies. Cupcake applicake toffee.
  </p>

<blockquote class="twitter-tweet right" lang="en"><p>My top 2014 blog post: &quot;So You Think You’ve Built a Good Infinite Scroll&quot; <a href="http://t.co/aC51uupniv">http://t.co/aC51uupniv</a></p>&mdash; Adrian Roselli (@aardrian) <a href="https://twitter.com/aardrian/status/550503497024933888">January 1, 2015</a></blockquote>

  <p>
    Chocolate bar gingerbread macaroon lollipop pie icing. Dragée jelly-o jujubes cheesecake cake pie topping sweet roll. Candy canes pudding candy chocolate bar bonbon. Jelly-o dragée brownie pastry candy canes marzipan powder. Fruitcake sesame snaps liquorice oat cake danish chocolate sweet roll. Donut cheesecake cookie chocolate cake topping. Bear claw toffee halvah apple pie chocolate bar danish muffin. Unerdwear.com soufflé bonbon macaroon pie.
  </p>

  <p>
    Gummies croissant cookie jujubes. Bonbon pudding cookie. Dragée bear claw cheesecake. Bear claw chocolate chocolate cake applicake tootsie roll. Gummi bears cupcake tart halvah tootsie roll. Topping soufflé sesame snaps pastry gummi bears pie. Gummies pastry danish lollipop. Tart chupa chups dessert.
  </p>
</main>
!

CSS 

              
                /* Relies on solid background color for content */

@import url(https://fonts.googleapis.com/css?family=Oswald);
@import url(https://fonts.googleapis.com/css?family=Merriweather:400,700,700italic,400italic);

body {
  font-family: Tahoma, Arial, Helvetica, sans-serif;
  line-height: 1.7;
  font-size: 100%;
  background-color: #ccc;
}

main {
  margin: 0 2em;
}

q {
  font-family: Merriweather, serif;
}

q::before {
  content: "\201C";
}

q::after {
  content: "\201D";
}

blockquote, blockquote.twitter-tweet p {
  box-sizing: border-box;
  font-family: Merriweather, serif;
  font-style: italic;
  font-size: 1.25em;
  color: #444;
  margin: 1.5em 2em;
  padding: 0;
  border-top: .07em solid rgba(0,0,0,.5);
  border-bottom: .07em solid rgba(0,0,0,.5);
  /*border-radius: 1.5em 0 0 0;*/
}

blockquote.twitter-tweet {
  overflow: hidden;
}

blockquote i, blockquote em, blockquote code, blockquote cite {
  font-style: normal;
}

blockquote.right, blockquote.left {
  width: 33%;
}

blockquote.right {
  margin: 0 1em 1em 2em;
  float: right;
}

blockquote.twitter-tweet.right {
  margin-right: 0;
  padding-left: 5em;
}

blockquote.left {
  margin: 0 2em 1em 1em;
  float: left;
}

blockquote.twitter-tweet.left {
  padding-left: 4.5em;
}

blockquote footer, blockquote.twitter-tweet {
  /*font-size: 65%;*/
  font-family: Arial,Oswald;
  font-style: normal;
  /*text-align: right;*/
  border-top: .07em solid rgba(0,0,0,.5);
  border-bottom: .1em solid #ccc; /* Must match content area background color */
  padding: .5em 0 0 6.5em;
  margin: 0 0 -.1em 0;
  /*text-indent: 9em;*/
  position: relative;
  line-height: 1.1;
}

blockquote.right footer, blockquote.left footer {
  padding-left: 2em;
}

blockquote footer cite {
  font-size: 65%;
  font-family: Oswald;
}

blockquote footer cite::before, blockquote.twitter-tweet p::after {
  /*content: "\2014 ";*/
  content: "";
  display: block;
  width: 1em;
  height: 1em;
  position: absolute;
  top: -.55em;
  left: 8em;
  border-bottom: .1em solid rgba(0,0,0,.5);
  border-right: .1em solid rgba(0,0,0,.5);
  transform: rotate(45deg);
  background-color: #ccc; /* Must match content area background color */
}

blockquote.right footer cite::before, blockquote.left footer cite::before {
  left: 1em;
}

blockquote.twitter-tweet {
  border-bottom: none;
  border-top: none;
  font-size: 85%;
  font-family: Oswald;
  /*border: 1px dotted #f00;*/
}

blockquote.twitter-tweet p {
  position: relative;
  font-size: 150%;
  margin: 0 2em 1em -2.25em;
  padding: 1em 0;
  border-bottom: .07em solid rgba(0,0,0,.5);
  line-height: 1.7;
}

blockquote.twitter-tweet p::after {
  top: auto;
  bottom: -.45em;
  left: 2em;
  width: .75em;
  height: .75em;
  border-bottom: .07em solid rgba(0,0,0,.5);
  border-right: .07em solid rgba(0,0,0,.5);
}

blockquote.twitter-tweet.right p::after, blockquote.twitter-tweet.left p::after {
  left: 1em;
}
!

JS
!
999px

Console