CSS class selector syntax

@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>CSS Example</title>
    <style>
​
      .a {
        font-size: 2em;
      }
​
    </style>
  </head>
  <body>
​
    <svg width="300" height="250">
      <text class="a" x="50" y="50">Hello SVG Text!</text>
    </svg>
​
  </body>
</html>
    