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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              %form
  %input{type: "text", required: ""}
  %label{placeholder: "Adaptive Placeholder", alt: "Placeholder"}
/ Featured on LittleBigDetails
/ http://littlebigdetails.com/post/82478225432/
            
          
!
            
              // First, pass in the important variables.
.adaptive_placeholder(@height, @radius, @margin: 1em, @border: 1px) {
  @borders: (@border * 2); // <- To avoid repeating below
  box-sizing: border-box;  // <- Important for accurate sizing
  width: 100%;             // <- Could be almost anything
  height: ~"calc(@{height} + @{borders})"; 
  margin: 0 0 @margin;
  padding: @margin;
  border: @border solid #ccc;
  border-radius: @radius;
  background: #fff;
  resize: none;  // <- For textareas
  outline: none; // <- Because ugly
  //
  // Following block controls all the color change
  //
  &[required] {
    &:focus {
      border-color: #00bafa;
      + label {
        &[placeholder] {
          &:before {
            color: #00bafa;
          }
        }
      }
    }
    //
    // Following block selects label directly adjacent to input
    //
    &:focus,
    &:valid {
      + label {
        &[placeholder] {
          &:before {
            transition-duration: .2s;
            //
            // Following lines move placeholder out of the way
            //
            transform: translate(0, (@margin * -1.5)) scale(.9, .9);
          }
        }
      }
    }
    //
    // Following block injects string from label's 'alt' attr.
    // It comes before the other 'content' property so I can
    // override it. Uses "invalid" pseudo-selector to know
    // when to do that.
    //
    &:invalid {
      + label {
        &[placeholder] {
          &[alt] {
            &:before {
              content: attr(alt); // Content property 1 of 2
            }
          }
        }
      }
    }
    + label {
      &[placeholder] {
        display: block;
        pointer-events: none; // Allows clicking thru label
        line-height: @margin * 1.25;
        // Following pulls label into position
        margin-top: ~"calc(-@{height} - @{borders})";
        // Following offsets that above
        margin-bottom: ~"calc((@{height} - @{margin}) + @{borders})";
        //
        // Following ':before' is needed to switch between
        // different strings.
        //
        &:before {
          content: attr(placeholder); // Content property 2 of 2
          display: inline-block;
          margin: 0 ~"calc(@{margin} + @{borders})";
          padding: 0 2px;
          color: #898989;
          white-space: nowrap;
          transition: .3s ease-in-out;
          //
          // Following lines lets me use solid color as bkg img.
          // This lets me size bkg to something more sublte
          //
          background-image: linear-gradient(to bottom, #fff, #fff);
          background-size: 100% 5px;
          background-repeat: no-repeat;
          background-position: center;
        }
      }
    }
  }
}
//
// Following block is how I call the above function
//
input {
  @height: 3em;
  &[type="text"] {
    .adaptive_placeholder(@height, (@height / 2));
  }
}










// For Demo Only
html {
  height: 100%;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}
            
          
!
999px
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