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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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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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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

Add Packages

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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All packages are different, so refer to their docs for how they work.

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HTML 

              
                <!-- indicators -->
<div id="carouselExampleIndicators" class="carousel slide">
    <ol class="carousel-indicators">
        <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
        <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
        <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
    </ol>

    <!-- carousel content -->
    <div class="carousel-inner">
        <!-- first slide -->
        <div class="carousel-item active">
            <img class="d-block w-100" src="http://res.cloudinary.com/uetboo/image/upload/s--l5cvDhuJ--/v1527309885/image_eese2w.jpg" alt="First slide">
            <div class="carousel-caption d-md-block">
                <h3 data-animation="animated bounceInLeft">
                    This is the caption for slide 1
                </h3>
                <button class="btn btn-primary" data-animation="animated zoomInUp">Button</button>
            </div>
        </div>

        <!-- second slide -->
        <div class="carousel-item">
            <img class="d-block w-100" src=" http://res.cloudinary.com/uetboo/image/upload/s--OVCvOIy5--/v1527310000/607x400_bwk3q5.png" alt="Second slide">
            <div class="carousel-caption d-md-block">
                <h3 data-animation="animated bounceInRight">
                    This is the caption for slide 2
                </h3>
                <button class="btn btn-primary" data-animation="animated zoomInUp">Button</button>
            </div>
            <!-- second slide content -->
        </div>

        <!-- third slide -->
        <div class="carousel-item">
            <img class="d-block w-100" src="http://res.cloudinary.com/uetboo/image/upload/s--EKobeKHW--/v1527306790/blue-ferrari-612-scaglietti_iwqaa9.jpg" alt="Third slide">
            <div class="carousel-caption d-md-block">
                <h3 data-animation="animated bounceInDown">
                    This is the caption for slide 3
                </h3>
                <button class="btn btn-primary" data-animation="animated zoomInUp">Button</button>
            </div>
            <!-- third slide content -->
        </div>
    </div>

    <!-- controls -->
    <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
        <span class="carousel-control-prev-icon" aria-hidden="true"></span>
        <span class="sr-only">Previous</span>
    </a>
    <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="sr-only">Next</span>
    </a>
</div>
!

CSS 

              
                .carousel-caption h3 {
  animation-delay: 1s;
}

.carousel-caption button {
  animation-delay: 2s;
}

.carousel-item img {
  opacity: 0.8;
}
!

JS 

              
                (function($) {
  function doAnimations(elems) {
    var animEndEv = "webkitAnimationEnd animationend";

    elems.each(function() {
      var $this = $(this),
        $animationType = $this.data("animation");
      $this.addClass($animationType).one(animEndEv, function() {
        $this.removeClass($animationType);
      });
    });
  }

  var $myCarousel = $("#carouselExampleIndicators"),
    $firstAnimatingElems = $myCarousel
      .find(".carousel-item:first")
      .find("[data-animation ^= 'animated']");

  $myCarousel.carousel();

  doAnimations($firstAnimatingElems);

  $myCarousel.on("slide.bs.carousel", function(e) {
    var $animatingElems = $(e.relatedTarget).find(
      "[data-animation ^= 'animated']"
    );
    doAnimations($animatingElems);
  });
})(jQuery);
!
999px

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