X-ray

body {
  font-family: Monaco;
  font-size: 12px;
  color: rgba(0,0,0,.7);
}

svg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: block;
  width: 100%;
  height: 100%;
}

div,
a {
  position: relative;
  padding: 1em;
}

div {
  text-shadow: 0 1px 0 rgba(255,255,255,.5);
}

span {
  color: rgba(0,0,0,.4);
}

a {
  color: rgba(255,0,0,.5);
}
    </style>

var svgElement = document.querySelector('svg');
var maskedElement = document.querySelector('#mask-circle');
var circleFeedback = document.querySelector('#circle-shadow');
var svgPoint = svgElement.createSVGPoint();

function cursorPoint(e, svg) {
    svgPoint.x = e.clientX;
    svgPoint.y = e.clientY;
    return svgPoint.matrixTransform(svg.getScreenCTM().inverse());
}

function update(svgCoords) {
    maskedElement.setAttribute('cx', svgCoords.x);
    maskedElement.setAttribute('cy', svgCoords.y);
    circleFeedback.setAttribute('cx', svgCoords.x);
    circleFeedback.setAttribute('cy', svgCoords.y);
}

window.addEventListener('mousemove', function(e) {
  update(cursorPoint(e, svgElement));
}, false);

document.addEventListener('touchmove', function(e) {
    e.preventDefault();
    var touch = e.targetTouches[0];
    if (touch) {
        update(cursorPoint(touch, svgElement));
    }
}, false);
      //# sourceURL=pen.js
    </script>