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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

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Vendor Prefixing

About Vendor Prefixing

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <h1>Multiple Sticky Titles with CSS and JS</h1>
<section class="explanation">
  <p>On some mobile platforms there are lists that group items under multiple headings. As you scroll through the list, the current title or heading follows you until you reach the next one at which point the current one is pushed up and the new title or heading docks to the top. <br>This snippet emulates this functionality.</p>
  <p>
    I created this originally because of this
    <a href="http://stackoverflow.com/questions/13279725/getting-a-sticky-header-to-push-up-like-in-instagrams-iphone-app-using-css-a/13293684#13293684" target="_blank">question</a> on stack overflow.
  </p>

</section>

<div class="followMeBar">A</div>
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<div class="followMeBar">B</div>
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CSS 

              
                .followMeBar {
  background: #e64a19;
  padding: 10px 20px;
  position: relative;
  z-index: 1;
  color: #fff;
}

.followMeBar.fixed {
  position: fixed;
  top: 0;
  width: 100%;
  box-sizing: border-box;
  z-index: 0;
}

.followMeBar.fixed.absolute {
  position: absolute;
}


/* For aesthetics only ------------------------------------------------------------------*/

body {
  margin: 0;
  font-family: Segoe, "Segoe UI", "DejaVu Sans", "Trebuchet MS", Verdana, sans-serif;
}

h1 {
  font: 200 1.2em "Segoe UI Light", "DejaVu Sans", "Trebuchet MS", Verdana, sans-serif;
  font-weight: 200;
  color: #fff;
  background: #039be4;
  padding: 20px;
  margin: 0;
  border-bottom: 10px solid #ccc;
  strong {
    font-family: "Segoe UI Black";
    font-weight: normal;
  }
}

.explanation {
  padding: 20px;
  max-width: 600px;
  p {
    max-width: 300px;
    color: #fff;
    font-size: 0.8rem;
  }
}
!

JS 

              
                var stickyHeaders = (function() {

  var $window = $(window),
      $stickies;

  var load = function(stickies) {

    if (typeof stickies === "object" && stickies instanceof jQuery && stickies.length > 0) {

      $stickies = stickies.each(function() {

        var $thisSticky = $(this).wrap('<div class="followWrap" />');
  
        $thisSticky
            .data('originalPosition', $thisSticky.offset().top)
            .data('originalHeight', $thisSticky.outerHeight())
              .parent()
              .height($thisSticky.outerHeight()); 			  
      });

      $window.off("scroll.stickies").on("scroll.stickies", function() {
		  _whenScrolling();		
      });
    }
  };

  var _whenScrolling = function() {

    $stickies.each(function(i) {			

      var $thisSticky = $(this),
          $stickyPosition = $thisSticky.data('originalPosition');

      if ($stickyPosition <= $window.scrollTop()) {        
        
        var $nextSticky = $stickies.eq(i + 1),
            $nextStickyPosition = $nextSticky.data('originalPosition') - $thisSticky.data('originalHeight');

        $thisSticky.addClass("fixed");

        if ($nextSticky.length > 0 && $thisSticky.offset().top >= $nextStickyPosition) {

          $thisSticky.addClass("absolute").css("top", $nextStickyPosition);
        }

      } else {
        
        var $prevSticky = $stickies.eq(i - 1);

        $thisSticky.removeClass("fixed");

        if ($prevSticky.length > 0 && $window.scrollTop() <= $thisSticky.data('originalPosition') - $thisSticky.data('originalHeight')) {

          $prevSticky.removeClass("absolute").removeAttr("style");
        }
      }
    });
  };

  return {
    load: load
  };
})();

$(function() {
  stickyHeaders.load($(".followMeBar"));
});
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Console