SVG clipping path is positioned incorrectly when referenced as css clip-path property

Question

I set up this code pen: http://codepen.io/jasonpearson/pen/pjKwBZ

When you uncomment the -webkit-clip-path property, you can see the mask is smaller and not centered like it is when applied to the SVG. How can I adjust so the clipping mask shows up the same when applied using css or svg?

<style>
  * {
    padding: 0;
    margin: 0;
  }

  svg {
    border: 1px dotted black;
  }

  #myDiv {
    background: blue;
    max-width: 500px;
    //-webkit-clip-path: url('/#myClipPath')
  }
</style>

<div id="myDiv">
    <svg viewBox="0 0 100 100">
    <defs>
      <clipPath id="myClipPath">
        <circle cx="50" cy="50" r="30"/>
      </clipPath>
    </defs>

    <rect x="0" y="0" height="100" width="100" fill="yellow" clip-path="url(#myClipPath)" />
  </svg>  
</div>

Answer 1

You can switch the clipPath to using coordinates based on the objectBoundingBox, instead of absolute coordinates.

  * {
    padding: 0;
    margin: 0;
  }

  svg {
    border: 1px dotted black;
  }

  #myDiv {
    background: blue;
    max-width: 500px;
    -webkit-clip-path: url('/#myClipPath')
  }

<div id="myDiv">
    <svg viewBox="0 0 100 100">
    <defs>
      <clipPath id="myClipPath" clipPathUnits="objectBoundingBox">
        <circle cx="0.5" cy="0.5" r="0.3"/>
      </clipPath>
    </defs>

    <rect x="0" y="0" height="100" width="100" fill="yellow" clip-path="url(#myClipPath)" />
  </svg>  
</div>