JS Draw Black Rect SRC V1

<!DOCTYPE html>
<html>
<body onmousemove="drawe();">
<canvas id="myCanvas" width="500" height="500" style="border:1px">
Your browser does not support the canvas element.
</canvas>
<script>
function drawe(){
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
ctx.moveTo(event.x,event.y);
ctx.fillRect(event.x+.0001,event.y+.0001,event.x,event.y);
ctx.stroke();
}
</script>
</body>
</html>