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              <p>Making <a href="http://dribbble.com/shots/1254439--GIF-Mobile-Form-Interaction">this dribble</a> work per Brad Frost request :) Totally quick and dirty, but it gets the idea across. Credit for initial concept goes to <a href="http://dribbble.com/mds">Matt D Smith</a> on dribble.</p>

<div class="field--wrapper">
  <label for="fname">First Name</label>
  <input name="fname" placeholder="First Name" />
</div>

<div class="field--wrapper">
  <label for="lname">Last Name</label>
  <input name="lname" placeholder="Last Name" />
</div>

<div class="field--wrapper">
  <label for="city">City</label>
  <input name="city" placeholder="City" value="Springville" />
</div>

<p>I tried multiple ways to do this via CSS only, but wanting the label to be first (for accessibillity) sibling selectors wouldn't work to change the display of the label. They only work on the non-first element. Immediate sibling with adjust sibling (label + input) and any following with general sibling(label ~ input). Also there is no CSS you can use (attribute selector) to see if text has been entered (label + input:not([value=""]) or something).</p>

<p>So I had to go with JavaScript (jQuery) to add a class based on there being a value, and another class to show the "on" state for the active field.</p>

<p>Not too much JS code, but wish JS wasn't needed at all.</p>

<p>Update: Added some logic to fire the value check onload for any fields that have values initially.</p>
            
          
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              .field--wrapper {
  position:relative;
  margin-bottom:20px;
}
label {
  position:absolute;
  top:-13px;
  left:0;
  font-size:11px;
  color:#aaa;
  transition: all 0.1s linear;
  opacity:0;
  font-weight:bold;
}
label.on {
  color:#4481C4;
}
label.show {
  top:-15px;
  opacity:1;
}

body {
  padding:20px;
  /* the following line fixes a blink in chrome https://code.google.com/p/chromium/issues/detail?id=108025 */
  -webkit-backface-visibility: hidden;
}
            
          
!
            
              $(function(){
  var onClass = "on";
  var showClass = "show";
  
  $("input").bind("checkval",function(){
    var label = $(this).prev("label");
    if(this.value !== ""){
      label.addClass(showClass);
    } else {
      label.removeClass(showClass);
    }
  }).on("keyup",function(){
    $(this).trigger("checkval");
  }).on("focus",function(){
    $(this).prev("label").addClass(onClass);
  }).on("blur",function(){
      $(this).prev("label").removeClass(onClass);
  }).trigger("checkval");
});

            
          
!
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