Question:

Write the code necessary to create a 300 pixel by 300 pixel <canvas>. Within it, paint a blue 100 pixel by 100 pixel square with the top-left corner of the square located 50 pixels from both the top and left edges of the canvas.

Answer:

Here is one simple implementation:

<canvas id="c" width="300" height="300"></canvas>

<script>
  var canvas = document.getElementById( "c" );
  var drawing_context = canvas.getContext( "2d" );
  drawing_context.fillStyle = "blue";
  drawing_context.fillRect( 50, 50, 100, 100 );
</script>

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