What's wrong with canvas?

V

vasIvas2015-01-30 17:45:02

JavaScript

vasIvas, 2015-01-30 17:45:02

Here is the code and picture of the canvas sized 100x100 -

But with the size 200x200 -

Why is it somehow elongated, what does it have in all browsers?
Here is the clean code -

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Canvas</title>
  <script type="text/javascript">
    document.addEventListener( 'DOMContentLoaded', document_domContentLoadedHandler );

    function document_domContentLoadedHandler( ){
      var canvas = document.getElementById( 'canvas' );
      var context = canvas.getContext( '2d' );

      context.fillStyle = "green";
      context.fillRect(10, 10, 100, 100);
    }
  </script>
</head>
<body>
  <canvas id="canvas"></canvas>
</body>
</html>