Default SVG size

Unpredictable, browser-dependent
Better to specify SVG width, height

@currankelleher's famous introToD3 examples
artisanally ported to blockbuilder.org by @micahstubbs

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>SVG Example</title>
  </head>
  <body>
​
    <svg>
      <rect width="250" height="250"></rect>
    </svg>
​
  </body>
</html>
​
    