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HTML

              
                %header.nite
    %h1 CSS Clipping Path 
    %p
        Single element, basic shape clipping with no SVG markup. Based on this <a href="http://www.w3.org/TR/2013/WD-css-shapes-1-20130620/">W3C working draft of 6/2013.</a>
    %p
        Update: Added excellent animations by <a href="https://codepen.io/jakealbaugh">@jakealbaugh</a>
.polygon.shape Polygon

.circle.shape Circle

.ellipse.shape Ellipse

.rectangle.shape Rectangle

.inset-rectangle.shape Inset Rectangle

.shape Original, no clip
              
            
!

CSS

              
                $polygon: polygon(
    /* X and Y points */
    0 30%,
    30% 0,
    100% 0,
    100% 70%,
    70% 100%,
    0 100%
  );
;

$circle: circle(
    50%, /* X center point */
    50%, /* Y center point */
    45%  /* Radius Length */
  );
;

$ellipse: ellipse(
    50%, /* X center point */
    50%, /* Y center point */
    50%,  /* X Radius Length */
    25%  /* Y Radius Length */    
  );
;

$rectangle: rectangle(
    0,   /* X Position */
    25%, /* Y Position */
    100%, /* Width */
    50%,  /* Height */
    
    /* Optional Rounded Corners */
    15px,  /* X Radius*/
    15px   /* Y Radius */
  );
;

/* Inset rectangle is basically rectangle with different syntax */
$inset-rectangle: inset-rectangle(
    10px, /* Top Inset */
    10px, /* Right Insert */
    10px, /* Bottom Inset */
    10px, /* Left Inset */
    
    /* Optional Rounded Corners */
    10px,  /* X Radius*/
    10px   /* Y Radius */
  );
;

/* Animate these CSS shapes

Thanks to Jake Albaugh

Current interpolation between different CSS shapes is not great (ie. from circle to rectangle)

For this "reset" to animate smoothly, we need to redefine the clip path on hover using the same CSS shape function.

The idea is to redraw the path either the same size as the original div, or larger, because any excess shape (like in circles) will get clipped by the div itself.

The shape will appear to morph back in the dimensions of the div when in actuality, it's just filling up all the the space inside the div.
*/

$polygon-reset: polygon(0 0, 50% 0, 100% 0, 100% 50%, 100% 100%, 0 100%);
$circle-reset: circle(50%, 50%, 100%);
$ellipse-reset: ellipse(50%, 50%, 100%, 100%);
$rectangle-reset: rectangle(0, 0, 100%, 100%, 0px, 0px);
$inset-rectangle-reset: inset-rectangle(0,0,0,0,0,0);

.polygon {
  -webkit-clip-path: $polygon;
  &:hover {
    -webkit-clip-path: $polygon-reset;
  }
}

.circle {
  -webkit-clip-path: $circle;
  &:hover {
    -webkit-clip-path: $circle-reset;
  }
}

.ellipse {
  -webkit-clip-path: $ellipse;
  &:hover {
    -webkit-clip-path: $ellipse-reset;
  }
}

.rectangle {
  -webkit-clip-path: $rectangle;
  &:hover {
    -webkit-clip-path: $rectangle-reset;
  }
}

.inset-rectangle {
  -webkit-clip-path: $inset-rectangle;
  &:hover {
    -webkit-clip-path: $inset-rectangle-reset;
  }
}


.shape {
  width: 150px;
  height: 150px;  
  margin: 30px auto;
  
  background: rgba(0,160,250, .6);
  
  font-family: 'Open Sans';
  font-weight: 300;
  font-size: 16px;
  line-height: 150px;
  text-align: center;
  
  color: #eee;
  
  transition: all 200ms ease-out;
}

.shape:hover {
  box-shadow: inset 1px 1px #ccc, inset -1px -1px #ccc;
  background: rgba(0,0,0,.05);
  color: #999;
}

body {
  background: url('https://rawgithub.com/subtlepatterns/SubtlePatterns/gh-pages/tiny_grid.png');
}
              
            
!

JS

              
                
              
            
!
999px

Console